Journal articles on the topic 'Alloy composites'
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1
Avinash, L., T. Ramprabhu, Adithya Parthasarathy, K. N. Varun Kumar, and Basavaraj Sajjan. "Wear and Mechanical Behaviour of Hypo-Eutectic Al-7%Si-0.5%Mg Alloy (A357) Reinforced with Al2O3 Particles." Applied Mechanics and Materials 829 (March 2016): 66–72. http://dx.doi.org/10.4028/www.scientific.net/amm.829.66.
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In this study, A357 (Al-7%Si-0.5%Mg) alloy/Al2O3 composites with various volume fractions (4%, 8%, 10%) were prepared by using permanent mould casting. In addition, A357 alloys were cast for comparison purposes. The alloys and composites were given a T6 heat treatment process (solution treatment and artificial ageing), Also microstructure, hardness and tensile properties of these composites were evaluated and compared. In addition, tribological properties of these composites were evaluated using a Pin-on-Disc apparatus at a constant sliding velocity of 1m/s and pressure of 0.35 MPa. The microstructure of the composites shows homogenous distribution of Al2O3 plate-like particles in the Al matrix except in the A357/10%Al2O3 composite. The wear and mechanical properties of composites improve with increasing the volume fraction of Al2O3 upto 8% and then decreases. Particularly, mechanical properties of the A357/10%Al2O3 composite are lower than the alloy indicating that the critical volume fraction of Al2O3 reinforcement in the A357 alloy is 8%. Wear morphology studies show that abrasive and delamination wear are extensive in the alloy whereas the slight delamination wear with some abrasive grooves are found in the composites.
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Jung, Beom-Seok, Jung-Pyo Kong, NingXue Li, Yoon-Mi Kim, Min-Saeng Kim, Sung-Hoon Ahn, and Maenghyo Cho. "Numerical simulation and verification of a curved morphing composite structure with embedded shape memory alloy wire actuators." Journal of Intelligent Material Systems and Structures 24, no. 1 (September 21, 2012): 89–98. http://dx.doi.org/10.1177/1045389x12459588.
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Shape memory alloys have been actively studied in various fields in an attempt to utilize their high energy density. In particular, shape memory alloy wire-embedded composites can be used as load-bearing smart actuators without any additional manipulation, in which they act like a hinge joint. A shape memory alloy wire-embedded composite is able to generate various deformation behaviors via the combination of its shape memory alloy and matrix materials. Accordingly, a study of the various design parameters of shape memory alloy wire-embedded composites is required to facilitate the practical application of smart structures. In this research, a numerical simulation of a shape memory alloy wire-embedded composite is used to investigate the deformation behavior of a composite panel as a function of the composite width per shape memory alloy wire, composite thickness, and the eccentricity of the shape memory alloy wire. A curved morphing composite structure is fabricated to confirm the results of the numerical simulation. The deformation of the shape memory alloy wire-embedded composite panel is determined by measuring its radius of curvature. The simulated deformation behaviors are verified with the experimental results. In addition, an analysis of the deformation and internal stress of the composites is carried out. It can be used to obtain guidelines for the mechanical design of shape memory alloy wire-embedded composite panels.
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Wilk, M. S., and R. E. Śliwa. "The Influence of Features of Aluminium Alloys 2024, 6061 and 7075 on the Properties of Glare-Type Composites / Wpływ Właściwości Stopów Aluminium 2024, 6061, 7075 Na Cechy Kompozytu Typu Glare." Archives of Metallurgy and Materials 60, no. 4 (December 1, 2015): 3101–8. http://dx.doi.org/10.1515/amm-2015-0496.
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The above paper presents the assumptions and results of the research whose aim was to determine the influence of 2024, 6061 and 7075 aluminum alloys on the final properties of GLARE-type composites. GLARE 3 2/1 type composites, made of two layers of the epoxy prepreg, reinforced with unidirectional glass fibers, arranged in the direction of 0°/90°, and two sheets of aluminum with a thickness of 0.4 mm, were investigated. Composites of various stacking configurations of alloy layers, made of one type of aluminum alloy (so-called ‘homogeneous composites’), and two different alloys (mixed composites), were analyzed. The properties of the composites were evaluated with the use of the mixing rule and compared with the test results. The influence of the used aluminum alloys on mechanical properties of GLARE-type composites has been determined. GLARE-type composite made of 7075 alloy sheets had the most favorable mechanical properties in comparison to properties of composites with 2024 and 6061 sheets. It has been shown how the properties of GLARE-type composites depend on the type of the aluminum alloy. It has been also proved that the properties of GLARE-type composites can be evaluated with the use of the mixing rule.
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Aishwarya, J., M. Nithin Kumaar, Vaira Vignesh Ramalingam, and M. Govindaraju. "Sandwich composite of aluminum alloy and magnesium alloy through accumulative roll bonding technique." Metallurgical and Materials Engineering 28, no. 2 (June 30, 2022): 257–68. http://dx.doi.org/10.30544/761.
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Aluminum and magnesium alloys are lightweight materials with outstanding technical uses. Due to their combined qualities, composites built of aluminum and magnesium alloys have surpassed the utilization of these elements individually. Accumulative Roll Bonding was used to create a three-layered sandwich composite structure made of Al-alloy/Mg-alloy/Al-alloy. The composite structure's microstructure and mechanical characteristics were studied. A fine-grained AZ31 layer was formed, according to the microstructural study. At the Al-alloy/Mg-alloy contact, a diffusion layer was also seen. On the broken surface, fractography exhibited both ductile and brittle failure characteristics.
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Hembrom, S., B. N. Roy, N. Khobragade, and D. Roy. "Studies on Amorphous Alloy Dispersed Aluminium Matrix Composite Prepared by High Pressure Torsion." Journal of Materials Science Research 5, no. 1 (December 29, 2015): 89. http://dx.doi.org/10.5539/jmsr.v5n1p89.
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<p class="1Body">Aluminium-based composite reinforced with Cu base amorphous alloy dispersed composite was prepared by means of high pressure torsion between a powder mix of aluminium and amorphous Cu base alloy. The X-ray diffraction pattern of powdered and consolidated composites shows the aluminium phase while the thermal stability of the amorphous alloy was studied with the aid of differential scanning calorimetry (DSC). The microstructural feature of the composite through scanning electron microscope reveals the well-distributed reinforcements in the host aluminium matrix. The hardness measurement on the as prepared composites shows significant increase in hardness with increase in reinforced amorphous alloy. Wear property of the synthesized composites were measured by using ball on plate wear tester which shows increase in wear resistance with increase in reinforced amorphous alloys.</p>
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Vignoli, Lucas L., Marcelo A. Savi, and Sami El-Borgi. "Nonlinear dynamics of earthquake-resistant structures using shape memory alloy composites." Journal of Intelligent Material Systems and Structures 31, no. 5 (January 13, 2020): 771–87. http://dx.doi.org/10.1177/1045389x19898269.
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Earthquake-resistant structures have been widely investigated in order to produce safe buildings designed to resist seismic activities. The remarkable properties of shape memory alloys, especially pseudoelastic effect, can be exploited in order to promote the essential energy dissipation necessary for earthquake-resistant structures. In this regard, shape memory alloy composite is an idea that can make this application feasible, using shape memory alloy fibers embedded in a matrix. This article investigates the use of shape memory alloy composites in a one-story frame structure subjected to earthquakes. Different kinds of composites are analyzed, comparing the influence of matrix type. Both linear elastic matrix and elastoplastic matrix with isotropic and kinematic hardening are investigated. Results indicate the great energy dissipation capability of shape memory alloy composites. A parametric analysis allows one to conclude that the maximum shape memory alloy volume fraction is not the optimum design condition for none of the cases studied, highlighting the necessity of a proper composite design. Despite the elastoplastic behavior of matrix also dissipates a considerable amount of energy, the associated residual strains are not desirable, showing the advantage of the use of shape memory alloys.
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Avinash, L., Hemanth Kumar, Adithya Parthasarathy, K. N. Varun Kumar, and Basavaraj Sajjan. "The Effect of Ceramic Reinforcement on the Microstructure, Mechanical Properties and Tribological Behavior of Al-7.5%Si-0.5%Mg Alloy." Applied Mechanics and Materials 867 (July 2017): 3–9. http://dx.doi.org/10.4028/www.scientific.net/amm.867.3.
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In this investigation, A357 (Al-7.5%Si-0.5%Mg) alloy/Al2O3 composites with various weight fractions (4%, 8%, 10%) were prepared by using permanent mould casting. In addition, A357 alloys were cast for comparison purposes. Microstructure, hardness and tensile properties of these composites were evaluated and compared with as-cast alloy. In addition, tribological properties of these composites were evaluated using a Pin-on-Disc apparatus at a constant sliding velocity of 1m/s and pressure of 0.35 MPa. The microstructure of the composites shows homogenous distribution of Al2O3 plate-like particles in the Al matrix except in the A357/10%Al2O3 composite. The wear and mechanical properties of composites improve with increasing the weight percentage of Al2O3 upto 8% and then decreases. Particularly, mechanical properties of the A357/10%Al2O3 composite are lower than the alloy indicating that the critical weight fraction of Al2O3 reinforcement in the A357 alloy is 8%. Wear morphology studies show that higher wear rate in case of unreinforced specimen was associated with higher thickness of hardened layer and consequent delamination of wear debris from the surface which was confirmed by optical and scanning electron micrography.Whereas ductile and brittle mode of fracture is observed in Fractographic observation of composite. The present paper highlights the salient features of casting technique and characterization of aluminum alloy A357 and alumina metal matrix composite.
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Rajaram, G., S. Kumaran, and T. Srinivas Rao. "Tensile Behaviour of Al-Si Alloy and Al-Si/Graphite Composites at Elevated Temperatures." Materials Science Forum 710 (January 2012): 457–62. http://dx.doi.org/10.4028/www.scientific.net/msf.710.457.
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The high temperature tensile behaviour of Al-Si alloy and two of its composite systems with graphite as major reinforcement were investigated. The composites were developed by the stir casting method, wherein a mixture of graphite (3 wt %) and Cu / Ni (2 wt% each) were added into the molten Al-Si alloy to fabricate two systems such as Al-Si-Cu/graphite composite and Al-Si-Ni/graphite composite. The properties of composites were better than that of the matrix alloy. Tensile behaviour of alloy and composites were studied at different temperatures from room temperature to 300°C. It is found that the tensile strength of the alloy and composites were decreasing with increase in temperature. The transition elements (Cu / Ni) have played the key role in improving the ultimate tensile and yield strength of the composites over the alloy. The flow stress of the composite is more than that of the alloy. The strain hardening exponent value continuously drops with the increase of tensile temperature due to the thermal softening effect. The % elongation of the alloy is more than that of the composites. Fracture surfaces of the samples are analyzed by scanning electron microscope to understand the fracture mechanisms. Fractography reveals that the fracture behaviour of the alloy changes from cleavage mode at room temperature to complete ductile mode at high temperature.
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Park, Won Jo, Hae Young Jung, Sun Chul Huh, Han Ki Yoon, and Kang Kil Lee. "The Strength and Hardness of Metal Matrix Composites by Binder Additives." Key Engineering Materials 297-300 (November 2005): 489–94. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.489.
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20 vol.% aluminum borate whisker (Al18B4O33w) reinforced AC4CH alloy composite was fabricated by squeeze casting method. The matrix is controlled its impurities, which make metal alloys, especially AC4CH alloy that is made by restraining 0.2% Iron and aluminum to make a matrix material. The perform of composite materials was made from Al18B4O33w with 5% regulated three kinds of inorganic binders, SiO2, Al2O3 and TiO2 sol, respectively and then sintered at 1373K. The composites were obtained by squeeze cast infiltration of the molten alloy to the perform. Then it was squeeze casting into the matrix. The status of adhesions of whisker perform was Observed by SEM. Micro-Vickers hardness and tensile properties at the room temperature were estimated. Al18B4O33w/ AC4CH composites containing TiO2 sol has excellent properties on tensile properties and microvickers hardness compared with the other composites without inorganic binder, containing SiO2 and Al2O3 sol inorganic binder.
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Liu, Bingfei, Qingfei Wang, Shilong Hu, Wei Zhang, and Chunzhi Du. "On thermomechanical behaviors of the functional graded shape memory alloy composite for jet engine chevron." Journal of Intelligent Material Systems and Structures 29, no. 14 (June 13, 2018): 2986–3005. http://dx.doi.org/10.1177/1045389x18781257.
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This study presents a theoretical work for a novel adaptive jet engine chevron concept based upon embedding the functionally graded shape memory alloy actuators in a composite laminate, termed a functionally graded shape memory alloy actuator composite. The constitutive models of the functionally graded shape memory alloy actuator composites including the monolayer shape memory alloy composites and multilayer shape memory alloy composites with different volume fractions of the shape memory alloy were first given. An example using such models was discussed on a published finite element work on a shape memory alloy hybrid composite jet engine chevron concept to prove the validity of the theoretical work. The thermomechanical behaviors of the functionally graded shape memory alloy actuator composite with different volume fractions of the shape memory alloy subjected to the thermal loading were then discussed using the obtained constitutive model. The tip deflections of the jet engine chevron with different embedding patterns of the shape memory alloy were finally obtained.
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Higginson, R. L., H. Chang, and Jon Binner. "Microstructures of Alumina-Aluminium/Magnesium Interpenetrating Composites." Materials Science Forum 519-521 (July 2006): 1279–84. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1279.
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Interpenetrating composites allow a completely 3-dimensional matrix of two phases, in this case an alumina (ceramic) and aluminium-magnesium alloy (metal), to be developed. This 3-dimensionality yields a material with mechanical and physical properties that are superior to either the metal or ceramic individually. The composites were produced by heating an alumina foam and aluminium-magnesium alloys together in flowing nitrogen to in excess of 900°C. At these temperatures the alloy is drawn into the ceramic foam by capillary action. The infiltration process is dependent on the interaction of the alloy with the nitrogen atmosphere in the furnaces. This complex interaction and its affect on the microstructural development has been studied using Electron Backscatter Diffraction (EBSD) coupled with Energy Dispersive x-ray Spectroscopy (EDS).
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Choi, Yong Bum, Jae Woong Jung, Won Jo Park, Sun Chul Huh, Kwang Yong Lee, Han Ki Yoon, and Gen Sasaki. "Effects on Inorganic Binder to Improve Strength and Hardness of α+ Al18B4O33w/AC4CH Alloy Composites." Key Engineering Materials 261-263 (April 2004): 1451–56. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1451.
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20 vol.% aluminum borate whisker (Al18B4O33w) reinforced AC4CH alloy composite was fabricated by squeeze casting method. The matrix is controlled its impurities, which make metal alloys, especially AC4CH alloy that is made by restraining 0.2% Iron and aluminum to make a matrix material. The perform of composite materials was made from Al18B4O33w with 5% regulated three kinds of inorganic binders, SiO2, Al2O3 and TiO2 sol, respectively and then sintered at 1373K. The composites were obtained by squeeze cast infiltration of the molten alloy to the perform. Then it was squeeze casting into the matrix. The status of adhesions of whisker perform was Observed by SEM. Micro-Vickers hardness and tensile properties at the room temperature were estimated. Al18B4O33w/AC4CH composites containing TiO2 sol has excellent properties on tensile properties and micro-vickers hardness compared with the other composites without inorganic binder, containing SiO2 and Al2O3 sol inorganic binder.
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Noda, Masafumi, and Kunio Funami. "Strength and Formability of Fine-Grained Laminated Magnesium Alloy." Materials Science Forum 753 (March 2013): 465–68. http://dx.doi.org/10.4028/www.scientific.net/msf.753.465.
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The development of laminated composite Mg alloy sheets, prepared by solid diffusion and roll bonding, is an effective way of improving the stiffness and surface properties of these materials while retaining their lightness. Laminated composites consisting of a core of Mg alloy between sheets of A5083 alloy as the coating material with Ti foil interlayers were prepared by solid diffusion and roll bonding. The laminated material had a strength and was resistant to cracking during deformation. Compounds that were formed and dispersed at the bonding interface between the Al and Mg alloys subjected to grain refinement improved the fracture toughness and strength of the composites, and it was important that these compounds were formed discontinuously. The fracture toughness of the laminated composite was twice that of the base Mg alloy, and its Young's modulus was 57 GPa.
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Li, He, Li Hua Chai, Zi Yong Chen, Hai Jing Wang, and Tou Nan Jin. "Effect of TiB2 Content on Microstructure and Hardness of In Situ TiB2 Reinforced High Zinc Content Al-Zn-Mg-Cu-Zr Composite Materials." Materials Science Forum 894 (March 2017): 34–37. http://dx.doi.org/10.4028/www.scientific.net/msf.894.34.
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TiB2p/Al-10Zn-1.7Mg-1.0Cu-0.12Zr composite was prepared by synthesis of in-situ Al-TiB2 master alloy, high purity aluminum, pure zinc, pure magnesium, Al-50 wt% Cu and Al-4 wt% Zr master alloys. The mass fraction of TiB2 particles was varied from 0% to 9.14%. SEM and TEM were applied to evaluate the microstructure and phase component. HB hardness test were carried out on hardness value of the matrix alloy and the composite. The results showed that TiB2 particles uniformly distributed in the composite and well combined with the matrix alloy. The average grain size of the composites decreased from 110.35μm to 52.07μm when the TiB2 particles is 4.47%, and the grain size changed slightly when TiB2 content increased further. The hardness value of the composites which raised from 189HB to 206HB is superior to that of the matrix alloy. As the content of TiB2 particles increased, HB hardness value also increased.
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Yadav, Govind, R. S. Rana, R. K. Dwivedi, and Ankur Tiwari. "Development and Analysis of Automotive Component Using Aluminium Alloy Nano Silicon Carbide Composite." Applied Mechanics and Materials 813-814 (November 2015): 257–62. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.257.
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Composite materials are important engineering materials due to their outstanding mechanical properties. Composites are materials in which the desirable properties of separate materials are combined by mechanically binding them together. Each of the components retains its structure and characteristic, but the composite generally possesses better properties. Composite materials offer superior properties to conventional alloys for various applications as they have high stiffness, strength and wear resistance. The development of these materials started with the production of continuous-fiber-reinforced composites. The high cost and difficulty of processing these composites restricted their application and led to the development of discontinuously reinforced composites. The aim involved in designing metal matrix composite materials is to combine the desirable attributes of metals and ceramics. The addition of high strength, high modulus refractory particles to a ductile metal matrix produce a material whose mechanical properties are intermediate between the matrix alloy and the ceramic reinforcement. Metal Matrix Composites with Aluminum as metal matrix is the burning area for research now a days.
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Janot, R., L. Aymard, A. Rougier, G. A. Nazri, and J. M. Tarascon. "Enhanced hydrogen sorption capacities and kinetics of Mg2Ni alloys by ball-milling with carbon and Pd coating." Journal of Materials Research 18, no. 8 (August 2003): 1749–52. http://dx.doi.org/10.1557/jmr.2003.0241.
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Solid-state hydrogen storage alloys are becoming a practical method to transport and utilize hydrogen as fuel for various technologies. In this paper, the kinetics and capacity of hydrogen desorption from Mg-based alloys have markedly been enhanced by tuning the surface composition of alloy particles. Mg2Ni–Ct, x composites (where t refers to the pregrinding time and x to the Brunauer–Emmet–Teller specific surface area) were prepared by ball-milling the alloy in the presence of preground graphite, and Pd-coated Mg2Ni alloy powders were obtained by controlled chemical deposition of Pd on the alloy surface. We have found that the optimization of the pregrinding step of carbon is a determinant factor in enhancing the hydrogen desorption capacity of the Mg2Ni–10 wt.% C10,320 composites to 2.6 wt.% at 150 °C, the maximum performance so far reported on desorption for Mg-based alloys. Such value can even be raised to 2.8 wt.% by applying Pd deposition on the composite.
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Sankaravadivel, P., N. Babu, M. Samuel Gemsprim, and N. Natarajan. "Wear Characteristics of Phosphor-Bronze/Boron Carbide Particulate Composites." Applied Mechanics and Materials 550 (May 2014): 48–52. http://dx.doi.org/10.4028/www.scientific.net/amm.550.48.
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The tribological properties of metal matrix composites (MMC’s) is of interest in several applications like bearing sleeves, piston and cylinder liners, aircraft brakes etc. The wear behaviour of unreinforced as well as B4C particles reinforced phosphor-bronze alloy composite material is studied as a function of sliding speed and applied loads under un-lubricated conditions. The content of B4C particles in the composite was varied from 1-6% in steps of 2% by weight. A pin on disc wear testing machine was used to evaluate the wear rate, in which cast iron disc was used as the counterface. Loads of 10-30N in steps of 10N and speeds of 1.30, 1.83 and 2.30 m/s was employed. The results indicated that the wear rate of both the composites and the matrix alloy increased with increase in load and sliding speed. However, the composites exhibited lower wear rate than the alloys.
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Chen, Liang-Guang, Kung-Hsien Shue, Shou-Yi Chang, and Su-Jien Lin. "Squeeze casting of SiCp/Al-alloy composites with various contents of reinforcements." Journal of Materials Research 17, no. 2 (February 2002): 376–85. http://dx.doi.org/10.1557/jmr.2002.0053.
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Aluminum matrix composites reinforced with various contents and sizes of silicon carbide particles (SiCp) were fabricated by squeeze casting. A lower melting point AA A383 aluminum alloy (A383 Al) was squeezed into the higher melting point SiCp/pure aluminum (SiCp/pure Al) and SiCp/AA 6061 aluminum alloy (SiCp/6061 Al) preforms. The volume percents of the ceramic reinforcements were effectively lowered from traditional 50 to 8–25 vol% by the addition of pure Al and 6061 Al powders in the preforms. The SiC particles uniformly distributed within the matrices, and no pore was found in these composites. The growth of silicon precipitates in A383 Al alloys was limited by the addition of the aluminum alloy powders and SiC particles, and the tensile properties of the alloys were effectively enhanced by the refinement of the silicon precipitates. The tensile strengths and elongations of the SiCp/pure Al/A383 Al and SiCp/6061 Al/A383 Al composites were both better than those of the A383 Al alloy. The T6-treated 12-μm SiCp/6061 Al/A383 Al composite exhibited the highest tensile strength of 301 MPa.
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Аборкин, А. В., И. В. Сайков, В. Д. Бербенцев, А. М. Объедков, А. Е. Сычев, and М. И. Алымов. "Применение газовой экструзии для синтеза высокопрочного композита на основе алюминиевого сплава серии 5xxx, упрочненного углеродными наноструктурами." Письма в журнал технической физики 46, no. 5 (2020): 7. http://dx.doi.org/10.21883/pjtf.2020.05.49099.18109.
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Composite materials based on aluminum alloy 5xxx series, reinforced by 0.1 wt.% MWCNTs or 0.1 wt.% WC1-x/MWCNTs, were synthesized by high-energy ball milling and subsequent gas extrusion. The structural-phase composition and physical-mechanical properties of bulk composites are characterized. By comparative analysis of the results obtained with published data on the properties of composites based on aluminum alloys 5xxx series shows the prospects for the use of gas extrusion for consolidation, as well as the effectiveness of alloy strengthening by microadditives MWCNT-hybrid nanostructures.
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El-Khair, Malak Abou, Fatma Firouz, Ahmed Lotfy, Essam Mohamed, and Atef Daoud. "Microstructure and Wear Behavior of Squeezed Magnesium Alloy (AM100) Based Composites Reinforced with ZrB2, Graphite and Hybrid of ZrB2 and Graphite Particles." Key Engineering Materials 835 (March 2020): 155–62. http://dx.doi.org/10.4028/www.scientific.net/kem.835.155.
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An attempt has been made to investigate the microstructures and wear behavior of magnesium alloy AM100 (Mg-Al-Mn) based composites reinforced with 7 vol. % of ZrB2, graphite or hybrid of (1:1) ZrB2 and graphite particles as well as the unreinforced magnesium alloy. Magnesium alloy was melt under shield of inert gases and composites were prepared using stir casting method. Optical microscopy was used to study the microstructures of the unreinforced alloy and composites. The composites characterized primarily by the uniform distribution of particles in the matrix and a good adherence between the particles and matrix. XRD analysis was used to identify the phases of the unreinforced alloy and composites. The XRD diffraction pattern of AM100 matrix reveals different phases, namely, Mg, AlMn and Al12Mg17. Formation of these phases is due to the reaction between alloy constituents. Dry sliding wear tests were conducted by using a pin-on-ring apparatus. The wear rates of the composites and matrix alloy were measured at loads of 10, 20 and 30 N, and sliding speed of 0.7 m/s. The worn surfaces of the composite pins were examined by scanning electron microscopy (SEM). The experimental results of the wear tests showed that the magnesium based composites exhibited higher wear rate at all the applied loads when compared to those of the unreinforced magnesium alloy. The ZrB2 reinforced magnesium composite exhibited the lowest wear rate amongst the composites material investigated in the present work.
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Vencl, Aleksandar, Ilija Bobic, and Blaza Stojanovic. "Tribological properties of A356 Al-Si alloy composites under dry sliding conditions." Industrial Lubrication and Tribology 66, no. 1 (February 4, 2014): 66–74. http://dx.doi.org/10.1108/ilt-06-2011-0047.
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Purpose – Aluminium alloys are frequently applied in automotive and other industries, since they provide mass reduction. Besides positive effects, aluminium alloys have their shortcomings reflected, first of all, in inappropriate tribological properties of these materials. The aim of this research was to enable the production of cheap aluminium alloy matrix composite with favourable combination of structural, mechanical and tribological properties, focusing on the tribological behaviour. Design/methodology/approach – The A356 Al-Si alloy was used as a matrix for producing metal matrix composites in compocasting process. Three different materials, in form of particles, were added to the matrix (Al2O3, SiC and graphite). Hardness and tribological properties (wear, friction and wear mechanism) of heat-treated (T6) samples were examined and compared. Tribological tests were carried out on ball-on-block tribometer under dry sliding conditions. Sliding was linear (reciprocating). Counter body was alumina ball. Average velocity was 0.038 m/s (max. 0.06 m/s), sliding distance was 500 m and normal load was 1 N. Findings – The effect of two different ceramic particles and graphite particles on tribological properties of obtained composites was evaluated. Wear resistance of composites reinforced with SiC particles was higher and coefficient of friction was lower compared to the composite reinforced with Al2O3 particles. A dual hybrid composite (with SiC and graphite particles) showed the lowest value of wear rate and friction coefficient. Dominant wear mechanism for all tested material was adhesion. Research limitations/implications – It seems useful to continue the work on developing hybrid composites containing soft graphite particles with A356 Al-Si alloy as matrix. The major task should be to improve particles distribution (especially with higher graphite content) and to explore tribological behaviour in diverse working conditions. Originality/value – Particulate composites with A356 aluminium alloy as a matrix produced in compocasting process using ceramic particles (Al2O3, SiC) were investigated in many researches, but there are only few detailed analyses of dual composites (with the addition of ceramic and graphite particles). In some previous studies, it was shown that compocasting process, as relatively cheap technology, can obtain good structural and mechanical characteristics of composites. In this study, it was shown that even a low graphite content, under specified conditions, can improve tribological properties.
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V. A., Gulevskiy. "The Composites materials Type Carbon –Aluminum Alloy." Scientific Bulletin of Naval Academy XXI, no. 2 (December 15, 2018): 8–12. http://dx.doi.org/10.21279/1454-864x-18-i2-001.
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The article contains technology of producing of carbon-aluminum alloy type composite with using non-autoclave (gasless)way of impregnation carbographite skeleton by matrix aluminum alloy. The article shown the results of the tests, the scope and the evaluation of the properties of the obtained composites.
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Xing, Ting Yong, Yan Jun Zheng, and Li Shan Cui. "Internal Friction Behaviors of TiNi Shape Memory Alloy Fiber/Ni Matrix Composite." Materials Science Forum 546-549 (May 2007): 1637–42. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1637.
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The objective of present work is to investigate the internal friction behavior of TiNi shape memory alloy fiber/Ni matrix composite. The TiNi fiber/Ni matrix composite was fabricated by an electroplating method using TiNi alloy fiber as the cathode and Ni plate as the anode. The internal friction as functions of temperature and strain amplitude was measured respectively. The results showed that the internal friction peaks of the TiNi/Ni matrix composites, which due to the martensitic reverse transformation of the TiNi fiber, broadened with increasing prestrain level. There was a sharp internal friction increment at the high temperature, which due to thermal expansion mismatch between the TiNi fiber and Ni matrix and recovery stress generated. Contrast to the pure TiNi alloys, the internal friction background of the TiNi/Ni composites increased with increasing temperature. Furthermore, the internal friction of the TiNi/Ni composites decreased with increasing strain amplitude measured.
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Gupta, Pankaj K., and MK Gupta. "Mechanical and microstructural analysis of Al-Al2O3/B4C hybrid composites." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 12 (August 5, 2020): 1503–14. http://dx.doi.org/10.1177/1464420720942554.
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The present work aims to enhance the mechanical performance of monolithic Al alloy and single reinforced metal matrix composite using a hybridization technique. The microparticles of alumina and boron carbide were reinforced into cast Al alloy (6061) in a systematic varying ratio (i.e.100/0, 75/25, 50/50, 25/75 and 0/100) to prepare the hybrid metal matrix composites via stir casting method. The mechanical properties (i.e. tensile, impact, hardness and flexural) of the prepared composites were investigated as per ASTM standards. Furthermore, microstructural analysis of unfractured and fractured composite samples was also carried out using Scanning Electron Microscope. It was observed that hybrid composites comprising of microparticles revealed an enhanced tensile, flexural and hardness properties, and reduced impact energy and porosity as compared to Al alloy and single reinforced metal matrix composites. The highest values of tensile strength and modulus were offered by a hybrid composite (B50A50), which was 40% and 52.12% higher than that of Al alloy. Furthermore, there was an improvement of 105.72% in flexural strength and a reduction of 23.88% in impact energy for composite B50A50 than that of Al alloy. The present developed hybrid metal matrix composites can be proposed to be used in automobile parts and construction applications.
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Ho, C. T. "Carbon fiber-reinforced tin-lead alloy composites." Journal of Materials Research 9, no. 8 (August 1994): 2144–47. http://dx.doi.org/10.1557/jmr.1994.2144.
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Brominated, anodically oxidized, and pristine p-100 carbon fiber reinforced tin-lead alloy composites were fabricated by squeeze casting. The fibers were brominated by bromine vapor for 48 h and then desorbed at 200 °C in air for 12 h. The anodic oxidation treatment of fibers involved electrochemical etching in a dilute sodium hydroxide electrolyte for 3 min, or immersing in nitric acid for 72 h. The composites containing surface-treated carbon fibers had higher tensile and interlaminar shear strength than the ones containing pristine carbon fibers. The composite containing brominated carbon fibers had better tensile strength than the other two surface treatments.
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Seikh, Ziyauddin, Mukandar Sekh, Sandip Kunar, Golam Kibria, Rafiqul Haque, and Shamim Haidar. "Rice Husk Ash Reinforced Aluminium Metal Matrix Composites: A Review." Materials Science Forum 1070 (October 13, 2022): 55–70. http://dx.doi.org/10.4028/p-u8s016.
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Metal matrix composite materials are a novel material generation capable of handling the implementation of advanced technology's growing needs. Aluminium-based metal matrix composites are widely used in automobiles and aerospace, as well as other industries, including defence and marine systems, due to their relatively low processing costs as compared to other matrices such as magnesium, copper, titanium, and zinc. Ceramic particles were shown to improve mechanical properties like hardness and tensile strength. The product's compactness and price, however, were both boosted. Agricultural waste materials are widely available today in significant amounts, and researchers have focused on using wastes as reinforcing fillers in composites to counteract pollution. Rice husk ash added to an aluminium alloy matrix increases the composite's mechanical properties while also increasing its wear resistance. According to scanning electron micrographs of the composite, the ash from rice husks is evenly distributed all over the aluminium matrix. Wear can vary from micro-cutting to oxidation at high temperatures in an aluminium alloy. Strain fields are produced and composite material wear resistance is improved due to the difference in coefficients of thermal expansion between the matrix and reinforcing materials. This study focuses on the production process, properties, and performance of an aluminium alloy composite incorporating rice husk ash, which has high hardness as well as wear resistance.
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Dasgupta, Rupa, A. K. Jha, and S. Das. "Effect of Addition of Fine SiC Particles on the Dry Sliding Wear Behaviour of Extruded 2014 Al-Alloy." ISRN Tribology 2013 (December 16, 2013): 1–9. http://dx.doi.org/10.5402/2013/648524.
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Composites of 2014 alloy made by dispersing 10 vol.% of fine (20–50 µm) SiC particles using vortex method ensuring uniform distribution of SiC particles in the matrix have shown uniform distribution of SiC particles. Mechanical properties of the composites have also registered an improvement over the alloy. In an attempt to further improve the properties, the composites were subjected to hot extrusion of cylindrical rods along with the alloys under similar experimental conditions. A temperature range of 300–350°C and an extrusion ratio of 10 : 1 were maintained during the process. The extruded samples were compared for their mechanical properties, and improvement was noted. The mechanism of material failure from fractographic studies showed difference in behaviour between the alloy and composite. Dry sliding wear studies carried out on extruded specimens exhibited improved wear behaviour in composites over alloys as measured by volume loss and wear rate. Wear mechanism was studied from the worn surface and correlated with the wear performance. It was observed that the presence of SiC particles reduces the tendency of delamination and thus material removal from the wear surface.
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Kurita, Hiroki, Katsuyoshi Kondoh, Junko Umeda, and Noriharu Yodoshi. "Tensile Fracture of TiB Whisker Reinforced Ti Alloy Matrix Composites." Materials Science Forum 941 (December 2018): 1961–65. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1961.
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TiB whisker reinforced Ti alloy matrix (Ti–TiB) composites have attracted attention as the aerospace materials with their high specific mechanical properties for long time. However, strengthening mechanism of Ti–TiB composites has not been revealed because of the agglomeration and incomplete precipitation of TiB whiskers in the Ti alloy matrix yet. In this study, we addressed to fabricate fully-dense TiB whisker reinforced Ti-6Al-4V alloy matrix (Ti6Al4V–TiB) composites via powder metallurgical process, which have the microstructure to discuss their tensile properties with the theories for composite materials. The Young’s modulus and ultimate tensile strength of Ti6Al4V–10 vol% TiB composite were 130 GPa and 1193 MPa, respectively. Note that the elongation of Ti6Al4V–10 vol% TiB composite was approximately 2.8 % although the elongations of Ti–TiB composite have been reported are few (; less than 1%) due to the agglomeration of TiB whiskers in Ti matrix.
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Hafizudin, Mohammad, Taufik Roni Sahroni, Mohd Razali Muhamad, Nurul Farah, and M. R. Kamal. "Mechanical Properties of Oil Palm Empty Fruit Bunch Fibers-Cast Alloy Composite Using Three Point Bending Test." Applied Mechanics and Materials 761 (May 2015): 374–79. http://dx.doi.org/10.4028/www.scientific.net/amm.761.374.
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This paper presents the mechanical properties of oil palm empty fruit bunch (OPEFB) fiber/epoxy resin reinforced cast LM6 (aluminum based) alloy composites. The metal matrix composite was fabricated by incorporating OPEFB/epoxy resin using mono filaments concept in the as cast LM6 alloys. Three different diameters (10, 12 and 14 mm) of the maximum force of metal matrix composite materials along with controlled sample (cast LM6 alloy + OPEFB/epoxy resin) were determined from three point bend testing. Test results showed that maximum force of mixture between OPEFB fibers composite and cast LM6 alloy for metal matrix composite are higher than that of cast LM6 alloy. Thus the utilization of OPEFB/epoxy composite as mono filaments in metal matrix composite can be significant in improving the strength of the cast LM6 alloy. Beside that increasing the diameter size of OPEFB/epoxy composite will reduce the weight of metal matrix composite (cast LM6 + OPEFB/epoxy composite).
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Swamy, A. R. K., A. Ramesha, J. N. Prakash, and G. B. Veeresh Kumar. "Mechanical and tribological properties of As-cast Al6061-Tungsten carbide metal matrix composites." Material Science Research India 7, no. 2 (February 8, 2010): 355–68. http://dx.doi.org/10.13005/msri/070205.
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The Aluminum (Al) and its alloys are finding extensive applications in industries like automobile, aerospace and marine fields. Aluminum-based Metal Matrix Composites (MMC?s) reinforced with hard particulates offer superior operating performance and resistance to wear. Al based MMC materials provide higher abrasive resistance and provide a longer service life compared to other materials. The popularity of composites may be the reason that these composites possess good mechanical properties, good corrosion resistance, wear resistance in addition they are light-in-weight. In this paper it is aimed to present the experimental results of the studies conducted related to hardness, tensile strength, and compression strength of Al6061-Tungstan Carbide (WC) composites. The composites were prepared using the liquid metallurgy technique (stir casting technique), in which 0-4 wt. % of reinforcing tungsten carbide particulates were dispersed into the base matrix alloy in steps of 1%. The obtained cast composites of Al6061-WC and unreinforced base alloy was subjected mechanical tests and composites were subjected to microstructural examination. The test results reveal that the hardness and strength of the alloy has increased monotonically. The wear resistance obtained using computerized pin on disc wear tester with counter surface as EN31 steel disc (HRC60) and the composite pin as specimens, demonstrated the superior wear resistance property of the composites.
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García-Vázquez, Felipe, Benjamín Vargas-Arista, Rodrigo Muñiz, Juan Carlos Ortiz, Héctor Hernández García, and Jorge Acevedo. "The Role of Friction Stir Processing (FSP) Parameters on TiC Reinforced Surface Al7075-T651 Aluminum Alloy." Soldagem & Inspeção 21, no. 4 (December 2016): 508–16. http://dx.doi.org/10.1590/0104-9224/si2104.10.
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Abstract: Aluminum alloys are very promising for structural applications in aerospace, military and transportation industries due to their light weight, high strength-to-weight ratio and excellent resistance to corrosion. In comparison to unreinforced aluminum alloys, aluminum/aluminum alloy matrix composites reinforced with ceramic phases exhibit higher strength and hardness, improved tribological characteristics. A novel surface modifying technique, friction stir processing (FSP), has been developed for fabrication of surface composite with an improved performance. The effect of FSP parameters such as number of passes, direction of each pass, sealed or unsealed groove on microstructure was investigated. In this work, nano-particles of TiC (2% in weight) were added to aluminum alloy AA7075-T651 to produce a functional surface. Fixed parameters for this AA7075 alloy were used; rotation speed of 1000 rpm, travel speed of 300 mm/min and pin penetration of 2.8 mm. Optical microscopy (OM), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were employed to study the microstructure of the fabricated surface composites. The results indicated that the selected FSP parameters influenced the area of surface composite, distribution of TiC particles and micro-hardness of the surface composites. Finally, in order to evaluate rate wear the pin on disk test was carried out.
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Sajjan, Basavaraj, L. Avinash, S. Varun, K. N. Varun Kumar, and Adithya Parthasarathy. "Investigation of Mechanical Properties and Dry Sliding Wear Behaviour of Graphite Reinforced Al7068 Alloy." Applied Mechanics and Materials 867 (July 2017): 10–18. http://dx.doi.org/10.4028/www.scientific.net/amm.867.10.
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The aim is to study the mechanical property and dry sliding wear behaviour of Al7068/graphite composite with various weight fractions (5%, 10%, 15%) were prepared by liquid metallurgy route was investigated. The average particle size of graphite is 40 μm. In addition, Al7068 alloys were cast for comparison purposes. The alloys and composites were given a T6 heat treatment process (solution treatment at 540 oC, water quenching at room temperature and artificial ageing at 170 oC) .Microstructure, hardness and tensile properties of these composites were evaluated and compared with as-cast alloy and the composites without T6 heat treatment. In addition, tribological properties of these composites were evaluated using a Pin-on-Disc apparatus with different parameters (constant velocity of 2m/s and varying loads as follows 10N, 15N, 20N, 25N, 30N) .The microstructure of the composites shows homogenous distribution of graphite particles in the Al matrix except in the Al7068/15% graphite composite. The wear and mechanical properties of composites improve with increasing the weight fraction of graphite upto 10% and then decreases gradually. This study provides an alternative way to enhance the tribological behaviour of Al7068/graphite composite. The study also highlights the different contribution of different input process parameters (like: composition of Al-graphite, molding technique and particle size of reinforcement material) on wear properties of Al-graphite MMCs.
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Mizumoto, Masayuki, Takeshi Ohgai, and Akio Kagawa. "Novel Separation Technique of Particle Reinforced Metal Matrix Composites by Fused Deposition Method." Materials Science Forum 539-543 (March 2007): 1028–32. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1028.
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To develop a novel separation technique of matrix alloys from metal matrix composite, separation experiments for various kinds of particle reinforced metal matrix composites (PRMMCs) were carried out. The Al-4mass%Cu alloy, Al-7mass%Si alloy and cast iron were used as matrix. The SiC particles (particle size: 75μm) and Al2O3 particles (particle size: 120μm) were used as reinforcement. The PRMMC specimen was placed in a silica tube container with a small nozzle (nozzle size: 0.75mm) at the bottom and was melted by H.F. induction heating. Then the molten PRMMC specimen was forced to flow out through the nozzle by applying a certain pressure of Ar gas. Most of the molten matrix alloy flowed out through the nozzle and the remainder in the container consisted of the reinforcements and a part of the matrix alloy. The amount of separated matrix alloy increased with decreasing the volume fraction of reinforcement particles in PRMMC specimens. With decreasing the fabrication temperature from 1273K to 1073K, the amount of matrix alloy separated from SiCP/Al-7mass%Si alloy composites increased. It is considered that a reaction layer formed on the surface of SiC particles at 1273K improves the wettability between the molten matrix alloy and SiC particle, which prevents the separation of molten matrix alloy from reinforcements. On the other hand, the amount of separated matrix alloy from 20vol% Al2O3P/cast iron composites was very high due to no reaction layer formed at interface between Al2O3 particle and cast iron.
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Rurua, Lamara, Levan Khundadze, and Lili Nadaraia. "Sintering of TiB2-TiC-SiC Composite Materials by Combined SPS/SHS Method." Materials Science Forum 1067 (August 10, 2022): 91–97. http://dx.doi.org/10.4028/p-r40082.
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The work aimed to determine the influence of iron-nickel alloy on the SPS sintering process of the TiB2-TiC-SiC composite. Composite casts were prepared with and without the additive of iron-nickel alloy to lower the sintering temperature. Composites were obtained by different methods. Samples were sintered directly from compounds and by a combined method where synthesis and sintering were conducted at the same time during SPS. The structure and properties of the composites were studied and compared. The addition of iron-nickel alloy allows sintering composites at lower temperatures, in addition, it reduces the porosity of the composite as iron-nickel alloy grains are placed between the composite grains and fill the gaps between the matrix polycrystals. Attention to ceramic matrix composite of the TiB2-TiC-SiC type is since they are characterized by a high melting point, high toughness, and high corrosion resistance. Above mentioned matrix was obtained at the temperature-1550°C by the SPS method. The addition of the iron-nickel alloy lowered it to 1200°C.
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Bin Hu, Liming Peng, and Wenjiang Ding. "Dry sliding wear behavior of Saffil fiber-reinforced Mg-10Gd-3Y-0.5Zr magnesium alloy-based composites." Journal of Composite Materials 45, no. 6 (December 7, 2010): 683–93. http://dx.doi.org/10.1177/0021998310377938.
Full textAbstract:
Dry sliding wear behavior of the creep-resistant magnesium alloy Mg-10Gd-3Y-0.5Zr and its composites have been investigated in this study. Magnesium matrix composites are prepared by squeezing casting infiltration of Mg alloy into Saffil preforms. Wear tests are conducted using ball-on-flat sliding wear set up under a sliding velocity range of 1-15 cm/s and at an applied load range of 1-8 N for a constant sliding distance of 150 m. According to results, mechanical and wear-resistance properties of magnesium alloy improved by introducing Saffil fibers, and the alumina binder composite has a higher strength and lower wear rate than silica binder composite. The wear rates of the matrix alloy, composites and their counter-face balls increase with increasing applied load. The increment of sliding velocities decreases the wear rate of the matrix alloy under the tested sliding velocities. A critical threshold of sliding velocity for the wear rate of both composites and their counter-faces is about 9 cm/s. Abrasion and plastic deformation are considered to be the dominant mechanism for the matrix alloy in tested conditions, and for both composites under low sliding velocity (<10 cm/s) and at low applied loads (1-5 N). Delamination is the wear mechanism of the silica binder composites at a high applied load (8 N). Adhesion and oxidation are the controlling wear mechanism of matrix alloy and composites under a sliding velocity of 15 cm/s.
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Qin, Feng Xiang, Zhen Hua Dan, and Guo Qiang Xie. "Mg-Based Bulk Amorphous Alloy Composites Fabricated by Spark Plasma Sintering." Materials Science Forum 783-786 (May 2014): 1931–36. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.1931.
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By using the Mg65Zn30Ca5amorphous powder prepared by ball-milling of the master alloy or its mixture powders, we produced Mg65Zn30Ca5bulk amorphous alloy and its composites by a spark plasma sintering process. The microstructure and corrosion properties of the prepared Mg65Zn30Ca5bulk amorphous alloy and its composites were investigated. The bulk amorphous alloy and its composites exhibited a high relative density and high corrosion resistance than commercial Mg alloys.
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Umar, MD, R. Muraliraja, V. S. Shaisundaram, and Shiferaw Garoma Wayessa. "Influence of Future Material Nano-ZrO2 and Graphene on the Mechanical Properties of Al Composites." Journal of Nanomaterials 2022 (September 22, 2022): 1–7. http://dx.doi.org/10.1155/2022/1454037.
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Recent developments in mechanical applications have led to the development of metal matrix composites, which represent the future of composite structures. Al7010 aluminium alloy matrix with nano-ZrO2 and graphene particle reinforced composite is created in this experiment. By adopting the stir casting procedure in two different casting, 2 percent reinforcement of zirconium dioxide and 1 percent of graphene is included in the composite materials. The composite’s metallurgical and mechanical characteristics are studied. The SEM image demonstrates uniform dispersion of the particles in the alloy matrix. The manufactured material’s ability to gather particulate matter is clearly found in SEM and EDS. The addition of zirconia particles works together to prevent the alloy matrix from dislocating, which increases the base material’s hardness as well as its tensile resistance. Similar results are also found in graphene-casting material. Results from tensile tests reveal that adding nano-zirconium dioxide particle (ZrO2) and graphene boosts the material’s tensile and hardness strength. In terms of the ultimate tensile strength (UTS), the Al7010/2% ZrO2 composite had a 6% increase and Al7010/1% graphene had a 5.5% increase above the Al7010 alloy. Compared to Al7010 alloy, the microhardness of Al7010/ZrO2 is 17.64% greater and Al7010/1% graphene is 14% greater.
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Chen, Xingxing, Ying Li, Ying Wang, Dingquan Song, Zuowan Zhou, and David Hui. "An approach to effectively improve the interfacial bonding of nano-perfused composites by in situ growth of CNTs." Nanotechnology Reviews 10, no. 1 (January 1, 2021): 282–91. http://dx.doi.org/10.1515/ntrev-2021-0025.
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Abstract Nano molding technology (NMT) has shown great potential in the preparation of metal/resin composites, which can integrate resin and metal into a lightweight, high-strength metal matrix composite. However, due to the poor interfacial bonding strength between metal and polymer, the application of the metal/polymer composites is limited. In this paper, we proposed a novel method to improve the bonding strength between Fe–Co–Ni alloy and epoxy resin by Nano Perfusion Technology (NPT), featuring in situ growth of carbon nanotubes (CNTs) in the pores on anodized Fe–Co–Ni alloy porous surface, followed by a perfusion of epoxy resin throughout the pores that had been in situ grown CNTs. Due to the “anchor effect” of CNTs, the bonding strength between the epoxy and the alloy matrix is improved. The results showed that the interfacial bonding between the in situ CNTs-modified alloy and the resin was significantly improved compared to the metal-resin composites surface treated with T-treatment in traditional method of NMT. The maximum interfacial bonding force of the alloy-CNTs/epoxy composite reached up to 691.80 N, which was 460, 315, and 267% higher than those by mechanical treatment, without CNTs and T-treatment, respectively. This work provides a new approach to protect metals or alloys from environmental corrosion, impact damage, and so on.
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Skury, Ana Lúcia Diegues, Marcia G. de Azevedo, Sérgio Neves Monteiro, and Apostolos J. Sideris. "Microstructure and Wear of a Cu-Si-B Alloy and Diamond Composites Obtained in High Pressure and High Temperature Conditions." Materials Science Forum 727-728 (August 2012): 436–39. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.436.
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Cu-Si-B alloys are a new generation of metal matrix for producing composites incorporated with diamonds for cutting tools. These alloys have been developed as a special matrix in order to improve the thermal properties of the diamond composites used in machining tool bits. Despite the industrial interest, not much has been reported on this type of composite matrix. In this work, samples of Cu-Si-B alloys were processed at high pressure and high temperature (HPHT) sintering conditions. The microstructure changes that occurred were evaluated. Microstructural aspects were observed by SEM. Compounds formed during sintering were studied by EDS. Wear tests were performed in sintered diamond particle incorporated composites. The results revealed significant advantages of Cu-Si-B alloy as matrix for these composites.
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Senthilkumar, R., N. Arunkumar, and M. Manzoor Hussian. "Effects of Micro and Nano-Size Al2O3 Particle Reinforcement on Mechanical Behaviour of Extruded Aluminum Alloy Matrix Composite." Applied Mechanics and Materials 787 (August 2015): 617–21. http://dx.doi.org/10.4028/www.scientific.net/amm.787.617.
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Aluminum alloy (AA2014) matrix composites reinforced by different weight percentage of aluminum oxide (Al2O3) in micro and nano sizes were fabricated through powder metallurgy route followed by hot extrusion process. Seven different aluminium composites with varying percentages of nano and micron sized alumina particles varying from 1% to 10% were evaluated in addition to monolithic alloy. The microstructure of nano-composite and monolithic alloys were examined by optical microscope and scanning electron microscope (SEM) equipped with an energy dispersive X-ray analysis (EDAX). In addition, the effects of weight fraction of the reinforcement matrix on mechanical properties were evaluated. The results have indicated that, a significant improvement in hardness of the nano composite was found in case of nano-composite with 8% of micro Al2O3 and 2% of nano Al2O3 particles by the addition of reinforcement.
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Shankar, Karthik Venkitraman, Jan Jezierski, Vaira Vignesh Ramalingam, Devaprasad Padmakumar, Midun Raj Leena, Amal, Gokul Reghunath, and Rakesh Krishnan. "Investigating the Effect of Fly Ash Addition on the Metallurgical and Mechanical Behavior of Al-Si-Mg-Cu Alloy for Engine Cylinder Head Application." Materials 15, no. 15 (August 8, 2022): 5462. http://dx.doi.org/10.3390/ma15155462.
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The authors researched the physical, metallurgical, and mechanical characteristics of A354 alloy (Al-Si-Mg-Cu) reinforced with 5, 10, and 15 wt% of fly ash metal matrix composites. A baseline alloy and three composites were fabricated by a liquid metallurgy route and poured into a permanent mold to obtain cast rods of dimension Φ32 mm × 156 mm. The metallurgical characterization of the developed alloy and metal matrix composites was conducted using energy-dispersive spectroscopy (EDS), field-emission scanning electron microscopy (FESEM), and X-ray diffraction. All the developed composites showed a pore-free nature, but only A354 alloy reinforced with 5 wt% of fly ash (AF5) possessed a homogeneous distribution and perfect bonding of the fly ash with the A354 matrix. Therefore, transmission electron microscopy (TEM) analysis was performed on the sample AF5. All developed alloys and metal matrix composites were subjected to hardness and mechanical property tests. It was observed that the AF5 sample had 170 ± 5.6 HV and tensile strength of 216 ± 2.3 MPa, 18.8% and 24.8% higher than the A354 matrix, but the ductility (6.5 ± 0.43%) was reduced by 23% from the baseline alloy. Finally, the fractography analysis was conducted on all the samples using FESEM to analyze the fracture mode. The fabricated 5 wt% fly ash-based metal matrix composite showed better mechanical performance than other samples. Hence, sample AF5 is suggested for manufacturing components in automotive and structural parts.
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Asano, Kazunori, Hiroyuki Yoneda, and Kenji Higashi. "Machinability of Short Potassium Titanate Fiber Reinforced Aluminum Alloy Composites Fabricated by Squeeze Casting." Advanced Materials Research 856 (December 2013): 36–40. http://dx.doi.org/10.4028/www.scientific.net/amr.856.36.
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Short potassium titanate fibers were selected as the reinforcements to obtain the machinable aluminum alloy composites. The composites were fabricated by squeeze casting, and the turning machinability of the composites was investigated. The whisker-reinforced composites were also fabricated to compare their properties with the fiber-reinforced composites. The cutting force was lowered by the reinforcement, and that of the fiber-reinforced composite was lower than that of the whisker-reinforced composites. The roughness of the machined surface was lowered by the reinforcement. This result and the in situ observation of cutting process indicate that the reinforcements in the composite suppress the formation of the built-up edge. Continuous chips were formed after cutting the unreinforced alloy, while serrated chips were formed after cutting the composites. Under the standard condition for the finishing cut of nonferrous metals, the composite can be machined for a long time without changing the carbide tool.
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Faisal, M. H., and S. Prabagaran. "Micro structural and static structural analysis of LM6/B4C and LM6/B4C/GR hybrid aluminium metal matrix composites." International Journal of Engineering & Technology 7, no. 1.1 (December 21, 2017): 37. http://dx.doi.org/10.14419/ijet.v7i1.1.8919.
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This research work was performed to interpret the fabrication and mechanical characteristics of LM6/B4C and LM6/B4C/Gr aluminium matrix composites. The aluminium matrix composites were manufactured by reinforcing B4C particles with varying wt % of 3, 5, 7 using stir casting technique. LM6/B4C 7% composite was made hybrid by adding 2% Graphite into it. The presence of graphite in such composites provide the self-lubricating effect, replacing conventional sliding contacts (bearings, sheaves, pistons, pulleys) with them. This also helps to reduce the lubricating oil and fuel consumption along with environmental benefits reducing energy wastage in industrial and automotive components. The properties of the composites were collated with the base alloy to analyse the enhancement in mechanical characteristics that had been transmitted by the reinforcement particles to the composites. The specimen microstructure was inspected using an optical microscope to ensure the uniform distribution of reinforcement particles in the matrix. The piston was modelled in CREO and using ANSYS 14.5 workbench static structural analysis of LM6 alloy, LM6/B4C composite and LM6/B4C/Gr hybrid aluminium composites are executed. Compared to LM6 alloy, better static structural properties were obtained in composites and hybrid composite.
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Riquelme, Ainhoa, María Dolores Escalera-Rodríguez, Pilar Rodrigo, and Joaquin Rams. "Laser Cladding of In Situ Al-AlN Composite on Light Alloys Substrate." Key Engineering Materials 724 (December 2016): 66–70. http://dx.doi.org/10.4028/www.scientific.net/kem.724.66.
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In situ metal matrix composites are novel composites in which the reinforcement is formed within the parent alloy by controlling chemical reactions during the composite fabrication. In recent years, there have been attempts to produce AlN composites utilizing the reactions between molten Al and a reactive gas. However, the conventional processing methods are sub-optimal and result in porosity, interface matrix-reinforcement deterioration, and high processing costs. The aim of this research is to develop a methodology to manufacture good-quality in situ Al-AlN composites in a cost effective way. In situ Al-AlN composite was synthesized with a laser cladding equipment. This composite powder can be directly deposited as coating on aluminum alloys conventionally used in the transport sector. The increase in the coatings tribological properties was demonstrated.
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Şahin, Y., and K. Emre Öksüz. "The Microstructure and Hardness of Al2O3 Particle Reinforced Composite." Applied Mechanics and Materials 232 (November 2012): 39–44. http://dx.doi.org/10.4028/www.scientific.net/amm.232.39.
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Aluminium alloys (Al2014 and Al2124 alloy) and their composites containing 10wt.% Al2O3 with 3 µm and 43 µm sizes of particles have been produced by powder metallurgy (PM) method and the microstructure and hardness were investigated. Scanning electron microscopy (SEM) investigation showed a nearly uniform distribution of the Al2O3 particles within the Al2124 alloy matrix although some porosities were found in the Al2014 alloy matrix. Furthermore, it was found that the macrohardness of Al2124 alloy composite improved highly in comparison to that of Al2014 alloy due to fine of microstructure and increased hardness. The hardnesses of both MMCs increased with increasing the particle sizes.
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Singh, Vibhu, Soni Kesarwani, and M. S. Niranjan. "IMPACT OF VARIATION IN SIZES OF BORON CARBIDE ON PROPERTIES OF NOVEL COMPOSITE OF ALUMINIUM ALLOY 6063-T6 AND BORON CARBIDE." International Journal of Engineering Applied Sciences and Technology 6, no. 7 (November 1, 2021): 322–32. http://dx.doi.org/10.33564/ijeast.2021.v06i07.050.
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Composites are continuously evolving as the most demanding materials among various industries because of their reinforced mechanical properties and lesser weight. The present work aimed to fabricate a novel aluminium matrix composite using Aluminium Alloy 6063 T6 as base metal and ceramic boron carbide particles with three different micro sizes viz.104μm, 74μm, and 53μm as reinforcement. For composite fabrication, stir casting technique has been utilized. Micro-structure and mechanical behavior of base alloy and prepared composites has been analyzed in this work. Observing through optical microscopy reveal a uniform and proper distribution of B4C particle in Al matrix, along with cluster formation at few sites. The results also exhibit that hardness of reinforced composite has been found to be more than that of base alloy by 81.35 %, in which composite with particle size 53μm has shown maximum hardness of 75.77HV. The trend in tensile strength indicates that the ultimate tensile strength of composite with boron carbide of mesh size 53μm is more than the base alloy by 20.79% and is also highest among the rest of composites with a value of 219.196MPa.
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Kwon, Hansang, Mart Saarna, and Marc Leparoux. "Effects of Processing Parameters on Mechanical Properties of Silicon Carbide Nanoparticle-Reinforced Aluminium Alloy Matrix Composite Materials." Journal of Nanoscience and Nanotechnology 20, no. 10 (October 1, 2020): 6482–88. http://dx.doi.org/10.1166/jnn.2020.17884.
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Nano-silicon carbide (nSiC) particle-reinforced aluminium (Al) 6061 alloy matrix composites were fabricated by high-energy ball milling, hot-pressing (HP), and hot-forging (HF). The composite powders were degassed and the composites were synthesised under air and/or vacuum. Mechanical properties of the obtained composite materials were evaluated using various tests, including indentation, compression, four-point bending, and tensile tests as well as by microstructural observations. Different amounts of nSiC were added and the mechanical properties of the obtained composite materials were measured and discussed. The microstructures of the composites depended on the nSiC content and synthesis conditions. The Vickers hardness and tensile strength values of the nSiC reinforced Al 6061 composites were approximately three times higher than that of a pure Al 6061 alloy bulk. The results demonstrated that the small amount of nSiC particles functioned as efficient reinforcement material in the Al 6061 alloy matrix composite material and that the strength and ductility of the composite material can be controlled by adjusting the processing parameters and nSiC content.
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Juang, Shueiwan Henry, and Ching-Feng Li. "Influence of Different Addition Ratios of Fly Ash on Mechanical Properties of ADC10 Aluminum Matrix Composites." Metals 12, no. 4 (April 11, 2022): 653. http://dx.doi.org/10.3390/met12040653.
Full textAbstract:
Aluminum-fly ash composites are formed by the chemical reaction between fly ash and the high-temperature aluminum-based alloy, which melts to form aluminum oxide as a reinforcing phase, which belongs to a composite of in situ synthetic reinforcing phases. Compared to aluminum-based alloys, composites have superior strength, rigidity, damping capacity, and wear resistance, but lower ductility and toughness. In this study, different fly ash addition ratios (0, 3, 6, 9, 12, and 15 wt%) were added to the ADC10-2Mg alloy melt via stir casting to form the aluminum-fly ash composite under the chemical reaction at 800 °C for 30 h. Subsequently, microstructure observation, density and porosity measurements, and hardness and tensile tests were conducted to analyze the influence of different fly ash weight percentages on the mechanical properties of aluminum-fly ash composites. According to the results, an aluminum-fly ash composite with good dispersibility of fly ash debris can be prepared by stir casting, and the fly ash particles gradually decomposed small debris as they reacted with the aluminum-based alloy at high temperatures during a long-term reaction process. The density of the aluminum–fly ash composite was reduced by adding fly ash, and its hardness and tensile strength were improved as well. However, the porosity increased with the amount of fly ash and the ductility was diminished. For the aluminum-fly ash composite with 6 wt% of fly ash, its density decreased by approximately 2%, the hardness and tensile strength increased by 7% and 49%, respectively, and the ductility decreased by 35%, as compared to those of the ADC10 alloy.
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Sekar, K. "Mechanical and Tribological Properties of A7075/ SiC/ B4C Hybrid Composite Fabricated by Stir and Squeeze Casting Method." Key Engineering Materials 882 (April 2021): 77–88. http://dx.doi.org/10.4028/www.scientific.net/kem.882.77.
Full textAbstract:
Aluminium alloys are having lightweight, high strength, good corrosive resistance, and toughness. In this paper, A7075/B4C/SiC Hybrid Composites fabricated with different wt. % of reinforcement materials by using stir and squeeze casting process. The SEM Microstructure have shown that uniform distribution of reinforcement particles in the A7075 matrix reinforced with 1 % wt. % B4C and 1 % wt. % SiC. The Mechanical properties of A7075/B4C/SiC Hybrid Composites were studied Composite A7075/B4C/SiC reinforced with 1 % wt. B4C and 1 % wt. SiC has shown more compressive and tensile strength compared to base alloy. The compressive strength of the composite increased 39.73 % and the tensile strength is increased 36.67 % compared to base alloy. From the dry sliding wear studies, the Composite with 1 B4C wt. % have shown less weight loss and coefficient of friction at all conditions due to the uniform distribution of the micro-particles within the matrix surfaces. Worn surface morphology has revealed that severe wear of A7075 base alloy became mild wear by preparing composite with 1 % wt. SiC, 0.5 wt. % B4C and then mild wear became less wear with shallow grooves by increasing reinforcement weight percentage of B4C from 0.5 to 1.
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Nagaraja, T. V., and Ravindra Sagar. "Microstructure and Mechanical Behavior of Chromium Oxide Reinforced LM26 Based Metal Matrix Composites." Materials Science Forum 1074 (November 8, 2022): 79–88. http://dx.doi.org/10.4028/p-8n979f.
Full textAbstract:
This work was focused on development of LM26 composites reinforced with Chromium Oxide particles by utilizing the technique of stir casting. Percentage of chromium oxide was varied between 0 to 10wt%. A study of the mechanical properties as well as microstructure of the developed composites had been performed. With the assistance of optical microscope, the microstructural studies of LM26 alloy as well as composites have been conducted. Investigations were carried out on the LM26 alloy as well as composites for properties such as tensile strength as well as hardness. Microstructure confirms that the chromium oxide particles' distribution has been uniform. The hardness of composites was found to higher than unreinforced alloy and increases over time as weight percentage increases of Chromium Oxide particles from 0% to 10%. For LM26/10% Chromium Oxide composite showed highest yield and tensile strength compared to other composites and unreinforced LM26 alloy. Keywords: Aluminium matrix composites, stir casting, Microstructure, Mechanical properties.