Relevant bibliographies by topics / Mechanical microstructural and fractographic characterization / Journal articles
To see the other types of publications on this topic, follow the link: Mechanical microstructural and fractographic characterization.

Journal articles on the topic 'Mechanical microstructural and fractographic characterization'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Mechanical microstructural and fractographic characterization.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Ceschini, Lorella, Anders E. W. Jarfors, Alessandro Morri, Andrea Morri, Fabio Rotundo, Salem Seifeddine, and Stefania Toschi. "High Temperature Tensile Behaviour of the A354 Aluminum Alloy." Materials Science Forum 794-796 (June 2014): 443–48. http://dx.doi.org/10.4028/www.scientific.net/msf.794-796.443.

Full text
Abstract:
The high temperature tensile behaviour of the A354 casting aluminum alloy was investigated also evaluating the influence of secondary dendrite arm spacing (SDAS). Cast specimens were produced through a gradient solidification equipment, obtaining two different classes of SDAS, namely 20-25 µm (fine microstructure) and 40-50 µm (coarse microstructure). After hot isostatic pressing and T6 heat treatment, the samples underwent mechanical characterization both at room and high temperature (200 °C). Results of tensile tests and hardness measurements were related to the microstructural features and fractographic characterization, in order to investigate the effect of microstructure and high temperature exposure on the mechanical behaviour of the alloy.
APA, Harvard, Vancouver, ISO, and other styles
2

Cvijović‐Alagić, Ivana, Vesna Maksimović, and Milan T. Jovanović. "Fractographic analysis of the aluminum matrix composite prepared by accumulative roll bonding." Metallurgical and Materials Engineering 26, no. 4 (November 12, 2020): 349–55. http://dx.doi.org/10.30544/569.

Full text
Abstract:
Recent research in the material science field is focused on the easy-to-apply and cost-effective production of the structural components with enhanced mechanical properties. As an answer to these new trends in the present study, the inexpensive household aluminum foils are used to produce the multilayer aluminum matrix composite. The aluminum matrix composites are manufactured by hot-rolling of the sandwiched foils and afterward subjected to microstructural characterization and mechanical testing. Analysis of the produced composite microstructure and fracture surface obtained after tensile testing was performed using the scanning electron microscopy (SEM). The qualitative fractographic analysis revealed that the ductile fracture features prevail in the overall fracture mode of the investigated multilayer composite, while the quantitative fractographic investigation allowed more detailed insight into the composite failure process and depicted critical parameters that led to the composite failure.
APA, Harvard, Vancouver, ISO, and other styles
3

Zheng, Xiu Hua, Bilal Dogan, and Karl Heinz Bohm. "Microstructural and Mechanical Characterization of TiAl/Ti6242 Diffusion Bonds." Materials Science Forum 546-549 (May 2007): 1393–400. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1393.

Full text
Abstract:
Ti-6242 alloys have been widely used in aero-engine applications due to high temperature strength and creep resistance. The γ-TiAl based intermetallics are considered as candidate materials to replace the current materials weed at high temperatures. The present paper reports on the microstructural and mechanical characterization of γ-TiA/Ti6242 diffusion bonds. The emphasis is put on the better understanding of microstructural development during diffusion process and mechanical properties of diffusion bonds. The process variables of temperature, pressure and time were optimized to produce joints with sound microstructure and bond quality for mechanical characterization. The micro and standard tensile tests were applied to determine bonding strength of joints. Metallographic and fractographic examinations on diffusion joints and tested specimens were carried out using SEM coupled with EDX. The concentration profiles of elements from EDX analysis combined with SEM/BSE investigation demonstrated that the strong inter-diffusion of main elements Al and Ti across the bonding interface occurred during DB process leading to the formation of a noticeable diffusion zone consisting of fine* α2/α grains. The micro tensile tests showed that the preference of fracture on base materials far from the bonding line, but a more marked tendency to brittle failure along bonding interface shown by the standard tensile test results, indicating a significant sample size effect on mechanical property measurements.
APA, Harvard, Vancouver, ISO, and other styles
4

Kim, Gyeung Ho, Mehmet Sarikaya, D. L. Milius, and I. A. Aksay. "Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 562–63. http://dx.doi.org/10.1017/s0424820100154780.

Full text
Abstract:
Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.
APA, Harvard, Vancouver, ISO, and other styles
5

Ceschini, Lorella, Iuri Boromei, C. Gambaro, Giangiacomo Minak, Alessandro Morri, and Fabrizio Tarterini. "Friction Stir Welding of Aluminium Based Composites Reinforced with Al2O3 Particles." Materials Science Forum 638-642 (January 2010): 87–92. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.87.

Full text
Abstract:
This paper presents the results of microstructural and mechanical characterization of Friction Stir Welding joints of two aluminum-based particles reinforced composites. The composites were FSW in the extruded and T6 heat treated condition. No post-weld heat treatment was carried out on the FSW joints. Hardness, tensile, low-cycle fatigue and impact tests were carried out. Microstructural and fractographic characterization were performed both on the base and FSW material, in order to investigate the effect of the solid-state welding process on the reinforcement particles and aluminum matrix. The FSW produced high quality joints with good microstructural characteristics: the welded zone displayed a refinement of the Al matrix grain size and reinforcement particles, and a better particle distribution. The FSW specimens showed high efficiency, both in the tensile, impact and fatigue tests.
APA, Harvard, Vancouver, ISO, and other styles
6

Agredo Diaz, Dayi Gilberto, Irma Angarita Moncaleano, and Rodolfo Rodríguez Baracaldo. "Production and characterization of dual-phase steels from an AISI 8620 steel with high Mn content." DYNA 88, no. 217 (May 10, 2021): 42–49. http://dx.doi.org/10.15446/dyna.v88n217.90451.

Full text
Abstract:
Dual phase steels are materials whose microstructure is composed of a ferrite matrix with martensite islands. Ferrite provides excellent ductility, while martensite increases the strength of steel, this provides a special appeal in the automotive industry. The main objective of this research is to obtain dual phase steels from AISI 8620 steel with a high Mn content, performing heat treatments in the intercritical range to obtain martensite percentages of 27, 33, 41, and 48%, respectively. Microstructural characterization is performed using optical microscopy and scanning electron microscopy techniques, the mechanical characterization is carried out using hardness, tension and charpy impact tests. The highest mechanical resistance is achieved in steel with 41% martensite phase, while the highest ductility is given for the material with 27% martensite, a fractographic analysis of all materials allowed to determine that the type of fracture presented is ductile. When the martensite fraction increases, the impact energy exhibits a decreasing behavior, while the hardness behaves in an increasing way.
APA, Harvard, Vancouver, ISO, and other styles
7

Bharath, V., V. Auradi, and Madeva Nagaral. "Fractographic characterization of Al2O3p particulates reinforced Al2014 alloy composites subjected to tensile loading." Frattura ed Integrità Strutturale 15, no. 57 (June 22, 2021): 14–23. http://dx.doi.org/10.3221/igf-esis.57.02.

Full text
Abstract:
In the current investigation, efforts are being made to produce an Al2014-Al2O3p composite with variable particle size of 88 mm by liquid stir casting route. 9, 12 and 15 weight proportions of Al2O3p were added to the Al2014 base alloy. By using SEM and EDS testing, microstructural studies have been conducted. Al2014-9, 12 and 15 weight proportion of Al2O3p composites mechanical behavior is determined in line with ASTM standards. Electron microscopic images showed that alumina (Al2O3p) particles are dispersed uniformly within the Al2014 composite matrix. EDS study confirmed the proximity of Al and O elements to composites reinforced by Al2O3p. It is also found that Al2014-Al2O3p composite hardness, UTS, and yield strength are improved by the addition of 9, 12 and 15 weight proportion of Al2O3p. Due to the addition of alumina particles in the Al2014 matrix alloy, the ductility of the produced composites decreases. Tensile fractography is performed using SEM to consider the mechanisms for failure.
APA, Harvard, Vancouver, ISO, and other styles
8

Morgado, Teresa L. M., Armando Sousa Brito, and Carlos M. Branco. "Failure Analysis of a Damaged Helicopter Rescue Hoist Cable." Materials Science Forum 730-732 (November 2012): 325–30. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.325.

Full text
Abstract:
This paper presents the results and main conclusions of a study made to analyze the cause of failure occurred with an austenitic 304 class stainless steel wire rope of a helicopter rescue hoist. The cable is made up of 19 strands, 12 outside and 7 inside. As each strand contains 7 wires, the whole cable is made up of 133 wires. The study includes the chemical and microstructural characterization of the material, as well as the determination of its hardness, mechanical properties and the fractographic analysis by scanning electron microscopy (SEM). Tensile tests were performed for three velocities simulating different work conditions: 250mm/min, 50mm/min and 5mm/min. The fractographic analysis shows that the cable suffered lateral loss of material due to friction and leading to the failure of the remaining material by ductile mode.
APA, Harvard, Vancouver, ISO, and other styles
9

Tarpani, José R., Maria H. P. Braz, Waldek W. Bose Filho, and Dirceu Spinelli. "Microstructural and Fractographic Characterization of a Thermally Embrittled Nuclear Grade Steel: Part I - Annealing." Materials Research 5, no. 3 (September 2002): 357–64. http://dx.doi.org/10.1590/s1516-14392002000300022.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Tarpani, José R., Maria H. P. Braz, Waldek W. Bose Filho, and Dirceu Spinelli. "Microstructural and Fractographic Characterization of a Thermally Embrittled Nuclear Grade Steel: Part II - Quenching and Tempering." Materials Research 5, no. 3 (September 2002): 365–71. http://dx.doi.org/10.1590/s1516-14392002000300023.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Tonelli, Lavinia, Vittoria Laghi, Michele Palermo, Tomaso Trombetti, and Lorella Ceschini. "AA5083 (Al–Mg) plates produced by wire-and-arc additive manufacturing: effect of specimen orientation on microstructure and tensile properties." Progress in Additive Manufacturing 6, no. 3 (May 6, 2021): 479–94. http://dx.doi.org/10.1007/s40964-021-00189-z.

Full text
Abstract:
AbstractAmong various additive manufacturing (AM) technologies, wire-and-arc additive manufacturing (WAAM) is one of the most suitable for the production of large-scale metallic components, also suggesting possible applications in the construction field. Several research activities have been devoted to the WAAM of steels and titanium alloys and, recently, the application of WAAM to aluminum alloys has also been explored. This paper presents the microstructural and mechanical characterization of WAAM plates produced using a commercial ER 5183 aluminum welding wire. The aim is to evaluate the possible anisotropic behavior under tensile stress of planar elements, considering three different extraction directions in relation to the deposition layer: longitudinal (L), transversal (T) and diagonal (D). Compositional, morphological, microstructural and fractographic analyses were carried out to relate the specific microstructural features induced by WAAM to the tensile properties. An anisotropic behavior was found in regard to the specimen orientation, with the lowest strength and ductility found on T specimens. Reasoning to this was found in the presence of microstructural discontinuities unfavorably oriented with regard to the tensile direction. The results of tensile tests also highlighted an overall good mechanical behavior, comparable to that of conventional AA5083-O sheets, suggesting future use in the realization of very complex geometries and optimized shapes for lightweight structural applications.
APA, Harvard, Vancouver, ISO, and other styles
12

Srivastava, Ashish K., Manish Maurya, Ambuj Saxena, Nagendra K. Maurya, Shashi P. Dwivedi, and Amit R. Dixit. "Microstructural and fractographic analysis of A359/Si3N4 surface composite produced by friction stir processing." International Journal of Materials Research 112, no. 1 (January 1, 2021): 68–77. http://dx.doi.org/10.1515/ijmr-2020-78277753.

Full text
Abstract:
Abstract High strength and lightweight materials are currently used in the automobile and defence sectors. In this framework, aluminium-based composites are a suitable choice due to their improved properties. The present study deals with the development of surface composites of A359/Si3N4 via friction stir processing. The varying percentage of reinforcement (2% to 6%) is the main criterion behind the study to observe its influence on mechanical, wear, thermal and corrosion properties. Investigations of microstructure and morphological characterization of the developed samples were conducted by optical light microscopy and scanning electron microscopy. Identification of the alloying elements, reinforcement materials and phase distribution is observed by EDS mapping. In addition, Raman spectroscopy and X-ray diffraction analysis were also conducted to validate the structural composition. As a research outcome, the effect of varying reinforcement percentage was examined on the tensile strength supported by fractographic analysis and hardness values. Apart from this, wear, thermal expansion and corrosion tests were conducted to assess the behavior of samples in different operation conditions. The results reveal the maximum tensile strength (478 MPa) and maximum hardness (119 HRB) with minimum wear loss (3.3 mg m–1), maximum thermal expansion (8.2 mm3) and maximum weight loss due to corrosion (0.0058 g) for A359/6%Si3N4 composite.
APA, Harvard, Vancouver, ISO, and other styles
13

Atapek, Ş. Hakan, Spiros G. Pantelakis, Apostolos N. Chamos, and Gülşah Aktaş Çelik. "Characterization of fatigue failed aged Cu-Ni-Si alloys." MATEC Web of Conferences 188 (2018): 02011. http://dx.doi.org/10.1051/matecconf/201818802011.

Full text
Abstract:
The precipitation hardenable and non-toxic Cu-Ni-Si alloys are good alternatives to Cu-Be and Cu-Co-Ni-Be alloys due to their high strength and high conductivity that can be attained by not only alloying but also thermo-mechanical routes. In this study, the fractographic analysis was carried out to understand the fatigue failure of aged 2.55Ni-0.55Si-0.25Zr-0.25Cr (wt-%) alloy which is a member of Corson family. In fatigue tests, a constant amplitude loading was applied at a stress ratio (R = σmin/σmax) of -1 and different stress levels (400, 350, 200 and 175 MPa) were used. The fracture response of the alloy was discussed depending on the applied stress levels and microstructural features. It was concluded that (i) Ni,Zr-rich precipitates and Cr-rich precipitates at the grain boundaries caused crack nucleation at all stress levels and (ii) the interaction between Ni-rich silicides and dislocations at lower stress level resulted in localized shearing and fine striations.
APA, Harvard, Vancouver, ISO, and other styles
14

Sarmiento Klapper, Helmuth, Jutta Klöwer, and Olesya Gosheva. "Hydrogen embrittlement: the game changing factor in the applicability of nickel alloys in oilfield technology." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, no. 2098 (June 12, 2017): 20160415. http://dx.doi.org/10.1098/rsta.2016.0415.

Full text
Abstract:
Precipitation hardenable (PH) nickel (Ni) alloys are often the most reliable engineering materials for demanding oilfield upstream and subsea applications especially in deep sour wells. Despite their superior corrosion resistance and mechanical properties over a broad range of temperatures, the applicability of PH Ni alloys has been questioned due to their susceptibility to hydrogen embrittlement (HE), as confirmed in documented failures of components in upstream applications. While extensive work has been done in recent years to develop testing methodologies for benchmarking PH Ni alloys in terms of their HE susceptibility, limited scientific research has been conducted to achieve improved foundational knowledge about the role of microstructural particularities in these alloys on their mechanical behaviour in environments promoting hydrogen uptake. Precipitates such as the γ ′, γ ′′ and δ-phase are well known for defining the mechanical and chemical properties of these alloys. To elucidate the effect of precipitates in the microstructure of the oil-patch PH Ni alloy 718 on its HE susceptibility, slow strain rate tests under continuous hydrogen charging were conducted on material after several different age-hardening treatments. By correlating the obtained results with those from the microstructural and fractographic characterization, it was concluded that HE susceptibility of oil-patch alloy 718 is strongly influenced by the amount and size of precipitates such as the γ ′ and γ ′′ as well as the δ-phase rather than by the strength level only. In addition, several HE mechanisms including hydrogen-enhanced decohesion and hydrogen-enhanced local plasticity were observed taking place on oil-patch alloy 718, depending upon the characteristics of these phases when present in the microstructure. This article is part of the themed issue ‘The challenges of hydrogen and metals’.
APA, Harvard, Vancouver, ISO, and other styles
15

Annamalai, A. Raja, Muthe Srikanth, A. Muthuchamy, Shashank Acharya, Anup Khisti, Dinesh K. Agrawal, and Chun-Ping Jen. "Spark Plasma Sintering and Characterization of Al-TiB2 Composites." Metals 10, no. 9 (August 19, 2020): 1110. http://dx.doi.org/10.3390/met10091110.

Full text
Abstract:
In this study, Al-TiB2 compacts fabricated by spark plasma sintering methods at different temperatures were characterized for densification, microstructural development, and mechanical properties. Sintering parameters used were temperatures of 500 °C and 550 °C under the pressure of 30 MPa. A very dense microstructure with uniform phase distribution and porosity was produced in the sample sintered at 550 °C with 2.5 wt% TiB2. The same sample exhibited excellent hardness value, and a high-tensile strength attributed to full metallurgical bonding, presence of sub-micron sized grains, and their uniform distribution. These results show that the TiB2 addition enhanced the composite’s hardness, sintered density, and tensile strength. In all the sintered samples, the fractographs revealed a mixed-mode fracture (ductile and brittle).
APA, Harvard, Vancouver, ISO, and other styles
16

Otto, Johannes L., Milena Penyaz, Kerstin Möhring, Lars Gerdes, Thorge Schaum, Alexander Ivannikov, Anke Schmiedt-Kalenborn, Boris Kalin, and Frank Walther. "Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals." Metals 11, no. 4 (April 5, 2021): 593. http://dx.doi.org/10.3390/met11040593.

Full text
Abstract:
The knowledge of alloy–process–structure–property relationships is of particular interest for several safety-critical brazed components and requires a detailed characterization. Thus, three different nickel-based brazing filler metals were produced with varying chromium and molybdenum content and were used to braze butt joints of the austenitic stainless steel AISI 304L under vacuum. Two holding times were used to evaluate diffusion-related differences, resulting in six specimen variations. Significant microstructural changes due to the formation and location of borides and silicides were demonstrated. Using X-ray diffraction, alloy-dependent residual stress gradients from the brazing seam to the base material were determined and the thermal-induced residual stresses were shown through simulations. For mechanical characterization, impact tests were carried out to determine the impact toughness, as well as tensile tests at low and high strain rates to evaluate the strain-rate-dependent tensile strength of the brazed joints. Further thermal, electrical, and magnetic measurements enabled an understanding of the deformation mechanisms. The negative influence of brittle phases in the seam center could be quantified and showed the most significant effects under impact loading. Fractographic investigations subsequently enabled an enhanced understanding of the fracture mechanisms.
APA, Harvard, Vancouver, ISO, and other styles
17

Forn, Antonio, Maite T. Baile, Enric Martín, Javier Goñi, and I. Sarriés. "Heat Treatments Effect on A357 Components Produced by SSM." Solid State Phenomena 116-117 (October 2006): 181–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.116-117.181.

Full text
Abstract:
The present work studies the effect the solution heat treatment, during artificial ageing and re-aging, has on the mechanical properties of an A357 aluminium alloy component formed by New Rheocasting. The effect that the evolution of silicon, during the solution treatment at various times, has on the mechanical properties was also examined. The mechanical properties were evaluated performing tensile tests, fractographical analysis and hardness tests. The microstructural characterization was made using optical and electronic microscopy.
APA, Harvard, Vancouver, ISO, and other styles
18

Srinivasan, S. A., S. P. Kumaresh Babu, and Vivek Gaurav. "Elucidation on the Microstructural and Mechanical Properties of Tailored VAL12 Hybrid Composites with ZrO2 Dispersoids Fabricated by Squeeze Casting Technique." Materials Science Forum 969 (August 2019): 813–18. http://dx.doi.org/10.4028/www.scientific.net/msf.969.813.

Full text
Abstract:
The effect of ZrO2(2, 4, 6 and 8 wt%) dispersoids with 1 wt% graphite on the microstructural, mechanical properties on squeeze cast VAL12 matrix hybrid composite is investigated in the present study. The hybrid composites were characterized using advanced characterization techniques to reveal its microstructural and physical properties. The microscopic examinations using optical and SEM technique reveal that the addition of dispersoids accelerates the nucleation kinetics, thus attaining fine, equiaxial grains in hybrid composites. The squeeze cast composites show almost nil porosity, defects and owing to it, the actual density of the composites are found to be more than 95% as that of the theoretical density values. The hardness values and tensile values increase with respect to the increase in percentage addition of ZrO2. The tensile results show that there is an appreciable increase in the UTS values of composites without much loss in its ductility as the addition of graphite improves the self-lubricating property and provides wettability during the casting. Fractographic studies on tensile tested specimen reveal that the crack occurs in both matrix and particles showing the good interface between matrix and dispersoids. Machinability studies reveal the formation of continuous chips in hybrid composites with a lower percentage of reinforcement (up to 4% ZrO2+ 1%Gr) and segmented chips in case of the composite with 8% ZrO2+ 1%Gr, as the increase in the percentage of dispersoids improve the chip breakability of the composites. On an overall, the hybrid aluminium matrix composites with 1%Gr and 6 % ZrO2unveiled better optimal results.
APA, Harvard, Vancouver, ISO, and other styles
19

Abdo, Hany S., and Asiful H. Seikh. "Mechanical Properties and Microstructural Characterization of Laser Welded S32520 Duplex Stainless Steel." Materials 14, no. 19 (September 24, 2021): 5532. http://dx.doi.org/10.3390/ma14195532.

Full text
Abstract:
This paper investigates an experimental design of laser butt welding of S32520 duplex stainless steel, which has been passed out with the help of a pulsed Nd: YAG laser supply. The intention of the present research is to learn the impact of beam diameter, welding speed, and laser power on the superiority of the butt weld. The individuality of butt joints has been characterized in terms of tensile properties, fractography, and hardness. It was noticed that unbalanced particle orientations indirectly produce a comparatively fragile quality in the laser welded joint. The outcome of varying process parameters and interaction effect of process parameters on ultimate tensile strength and micro hardness were studied through analysis of experimental data. With different process parameters, the heat energy delivered to the material was changed, which was reflected in tensile strength measurement for different welded samples. From this present research, it was shown that, up to a certain level, an increase in process parameters amplified the tensile strength, but after that, certain level tensile strength decreased with the increase in process parameters. When process parameters exceeded that certain level, the required amount of heat energy was not delivered to the material, resulting in low bead width and less penetration, thus producing less strength in the welded joint. Less strength leads to more ductile weld joints. Microhardness was higher in the weld zone than in the base region of welded samples. However, the heat affected zone had a high microhardness range.
APA, Harvard, Vancouver, ISO, and other styles
20

Mazahery, Ali, and Mohsen Ostadshabani. "Investigation on mechanical properties of nano-Al2O3-reinforced aluminum matrix composites." Journal of Composite Materials 45, no. 24 (May 9, 2011): 2579–86. http://dx.doi.org/10.1177/0021998311401111.

Full text
Abstract:
In this study, 0.75, 1.5, 2.5, 3.5, and 5 vol.% of alumina nanoparticles were incorporated into the A356 aluminum alloy by a mechanical stirrer and then, cylindrical specimens were cast at 800°C and 900°C. A uniform distribution of reinforcement, grain refinement of aluminum matrix, and presence of the minimal porosity was observed by microstructural characterization of the composite samples. Characterization of mechanical properties revealed that the presence of nanoparticles significantly increased compressive and tensile flow stress at both casting temperatures. The highest compressive flow stress was obtained by 2.5 vol.% of Al2O3 nanoparticles. It is then observed that the flow stress decreases when Al2O3 concentration increased further to 5 vol.% irrespective of the amount of deformation and casting temperature. It was revealed that the presence of nano-Al2O3 reinforcement led to significant improvement in 0.2% yield strength and ultimate tensile stress while the ductility of the aluminum matrix is retained. Fractography examination showed relatively ductile fracture in tensile-fractured samples.
APA, Harvard, Vancouver, ISO, and other styles
21

Nayan, Niraj, S. V. S. Narayana Murty, S. C. Sharma, and Parameshwar Prasad Sinha. "Processing of V65 Aluminium Alloy Wires Processed from Hot and Warm Rolled Rods for Rivet Applications." Materials Science Forum 710 (January 2012): 174–79. http://dx.doi.org/10.4028/www.scientific.net/msf.710.174.

Full text
Abstract:
High shear strength of 25 kg/mm2 combined with a high plasticity makes Russian grade V65 aluminum alloys as potential candidate compared to AA2024 for riveting applications in aerospace industries. The lower content of magnesium over the AA 2024 alloy decreases the aging kinetics of this alloy because of the decreased vacancy concentration in the as-quenched alloy which in turn gives flexibility to carryout riveting operation even after 4 days after solution heat treat¬ment and natural aging at room temperature. This paper presents the processing and characterization of V65 aluminium alloy wires processed from hot and warm rolled rods. Mechanical properties of the wires have been evaluated in T6 and T4 tempers and correlated with microstructures. Detailed microstructural examination using optical microscopy and fractography of the tensile tested samples using scanning electron microscopy were carriedout.
APA, Harvard, Vancouver, ISO, and other styles
22

Gu, Sen Dong, Ji Peng Zhao, Rui Jie Ouyang, and Yong Hong Zhang. "Microstructural Characterization and Tensile Behavior of TA1 Titanium Alloy Sheet Welded by Electron Beam Welding." Materials Science Forum 1027 (April 2021): 149–54. http://dx.doi.org/10.4028/www.scientific.net/msf.1027.149.

Full text
Abstract:
In the present study, TA1 titanium alloy sheets with a thickness of 0.8mm were welded by electron beam welding. Microstructure of the welded region was investigated using optical microscope and electron backscattered diffraction. Then, the tensile test was conducted to analyse the tensile behavior of the welded sheets as well as the fractography of the fracture surfaces. It is shown that the mean grain size in the heat-affected zone is smaller than that in the fusion zone and base material. The strength of the base metal is lower than that of the fusion zone and heat-affected zone. The average values of the yield strength, tensile strength and elongation of the tensile specimens are 224MPa, 335MPa and 35%, respectively. In addition, the tensile specimens of the welded sheets suffer both ductile and brittle deformation during the tensile tests.
APA, Harvard, Vancouver, ISO, and other styles
23

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
24

Pedapati, Srinivasa Rao, Dhanish Paramaguru, Mokhtar Awang, Hamed Mohebbi, and Sharma V. Korada. "Effect of process parameters on mechanical properties of AA5052 joints using underwater friction stir welding." Journal of Mechanical Engineering and Sciences 14, no. 1 (March 22, 2020): 6259–71. http://dx.doi.org/10.15282/jmes.14.1.2020.05.0490.

Full text
Abstract:
Underwater Friction Stir Welding (UFSW) is a solid-state joining technique which uses a non-consumable tool to weld metals. The objective of this investigation is to evaluate the mechanical properties of the AA5052 Aluminium alloy joints prepared by UFSW. The effect of different type of welding tools and welding parameters on the weld joint properties are studied. Square, tapered cylindrical and taper threaded cylindrical type of welding tools have been used to produce the joints with the tool rotational speed varying from 500 rpm to 2000 rpm while the welding speed varying from 50 mm/min to 150 mm/min. Tensile strength, micro-hardness distribution, fracture features, micro-and macrostructure of the fabricated weld joints have been evaluated. The effect of welding process parameters that influences the mechanical properties and fracture characterization of the joints are explained in detail. A maximum Ultimate Tensile Strength (UTS) value of 222.07 MPa is attained with a gauge elongation of 14.78%. Microstructural evaluation revealed that most of the fracture are found on the thermal mechanically affected zone (TMAZ)adjacent to the weld nugget zone (WNZ) due to bigger grain sizes. It is found that most of the joints exhibit ductile characteristics in failure. Fractography analysis has been used to find the behavior of weld joints in failure.
APA, Harvard, Vancouver, ISO, and other styles
25

Castagnet, M., L. M. Yogi, M. M. Silva, Mario Ueda, A. A. Couto, D. A. P. Reis, and C. Moura Neto. "Microstructural Analysis of Ti-6Al-4V Alloy after Plasma Immersion Ion Implantation (PIII)." Materials Science Forum 727-728 (August 2012): 50–55. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.50.

Full text
Abstract:
The search for alloys with improved high-temperature specific strength and creep-resistance properties for aerospace applications has led in the last decades to sustained research activities to develop new alloys and/or improve existing ones. Titanium and its alloys are excellent for applications in structural components submitted to high temperatures owing to their high strength to weight ratio, good corrosion resistance and metallurgical stability. Its high creep resistance is of great importance in enhancing engine performance. However, the affinity by oxygen is one of main factors that limit its application as structural material at high temperatures. Materials with adequate behavior at high temperatures and aggressive environmental became a scientific requirement, technological and economically nowadays. The objective of this work is the mechanical and microstructural characterization of the Ti-6Al-4V alloy after treatment by nitrogen Plasma Immersion Ion Implantation (PIII) process. The aim of this process is the improvement of superficial mechanical properties of the Ti-6Al-4V alloy. The selected alloy after ionic implantation process by plasma immersion was submitted to creep tests at 600 °C, in constant load mode at 250 and 319 MPa. The techniques used in this work were optical microscopy and scanning electronic microscopy. The fractograph analysis of the samples tested in creep shows narrowing phenomena and microcavities. The creep results show the significant increase of material resistance, it can be used as protection of oxidation in high temperatures applications.
APA, Harvard, Vancouver, ISO, and other styles
26

Alanka, Sandeep, Chanamala Ratnam, and Balla Srinivasa Prasad. "Characterization of cubic tumbler rod milled dispersed carbon nanotubes–Aluminum composites." Journal of Composite Materials 52, no. 28 (May 1, 2018): 3973–85. http://dx.doi.org/10.1177/0021998318773437.

Full text
Abstract:
In this work, cubic tumbler rod milling was used to disperse X wt% multiwalled carbon nanotubes (X = 0.5, 0.75, 1.0) in an aluminum matrix. Dispersed precursor of aluminum–multiwalled carbon nanotube composite was subsequently consolidated by cold compaction followed by sinter-forged process. Microstructural and mechanical behaviors of as-produced aluminum–multiwalled carbon nanotube composites with different concentration were investigated. Findings revealed that the as-produced Al–0.75 wt% carbon nanotube sinter-forged composite exhibits homogenous distribution and embedded nanotubes confirmed by the scanning electron microscope and the properties were observed to be increased significantly up to addition of 0.75 wt% of carbon nanotubes concentration than the pure aluminum as well as extruded composite and decrease to 1.0 wt% carbon nanotube due to the agglomeration of multiwalled carbon nanotube. However, enhancement of hardness, tensile strength, and Young’s modulus of the nanocomposites, compared with pure aluminum are 48.5, 83.8, and 30%, respectively. The tensile fractography of sinter-forged composite shows carbon nanotubes act like a bridge and barring the crack growth of aluminum matrix, remaining are pullout. Hence, it can be concluded that aluminum carbide phase starting from 0.75 wt% carbon nanotube and a strong interfacial bonding in as-produced aluminum–carbon nanotube composite has been observed which gives effective load transfer between aluminum matrix and carbon nanotubes.
APA, Harvard, Vancouver, ISO, and other styles
27

Dickson, J. I., Li Shiqiong, and J. P. Baïlon. "Microstructural and fractographic aspects of corrosion fatigue." Materials Characterization 28, no. 3 (April 1992): 327–47. http://dx.doi.org/10.1016/1044-5803(92)90020-i.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

Das, P., R. Jayaganthan, T. Chowdhury, and Inderdeep Singh. "Improvement of Fracture Toughness (K1c) of 7075 Al Alloy by Cryorolling Process." Materials Science Forum 683 (May 2011): 81–94. http://dx.doi.org/10.4028/www.scientific.net/msf.683.81.

Full text
Abstract:
The effects of cryorolling (Rolling at liquid nitrogen temperature) and optimum heat treatment (short annealing + ageing) on fracture toughness of 7075 Al alloy are reported in the present work. The Al 7075 alloy was rolled for different thickness reductions (40% and 70%) at cryogenic temperature and its mechanical, fracture toughness properties were studied. The microstructural characterization of the alloy was carried out by using Optical microscopy and Field emission scanning electron microscopy (FESEM). The cryo-rolled (CR) Al alloy after 70% thickness reduction exhibits ultrafine grain structure as observed from its FESEM micrographs. It is observed that the yield strength and fracture toughness of the CR material with 70% thickness reduction have increased by 108% and 73% respectively, compared to the starting material. The CR 7075 Al alloy shows improved fracture toughness and tensile strength due to high dislocation density, grain refinement, and ultrafine-grain (UFG) formation by multiple cryorolling passes. The CR samples were subjected to short annealing for 5 min at 190 0C, 170 0C and 150 0C followed by ageing at 160 0C, 140 0C and 120 0C for both 40% and 70% reduced samples. The combined effect of short annealing and ageing improves the fracture toughness, tensile strength, and ductility of cryorolled samples, which is due to precipitation hardening and subgrain coarsening mechanism respectively. The scanning electron microscopy (SEM) fractographs of the Al 7075 alloy samples reveals that starting bulk Al alloy specimens is fractured in a total ductile manner, consisting of well-developed dimples over the entire surface and dimple size got decreased continuously for cryorolled specimens at different percentage of thickness reduction (40% and 70%) as observed in the present work.
APA, Harvard, Vancouver, ISO, and other styles
29

Hamdollahzadeh, A., H. Omidvar, and A. Amirnasiri. "Microstructure and Mechanical Characterization of X70 Steel Welded Joints Through Hardness Mapping and Tensile Strength Testing." Archives of Metallurgy and Materials 62, no. 4 (December 1, 2017): 2021–27. http://dx.doi.org/10.1515/amm-2017-0301.

Full text
Abstract:
AbstractIn this paper, effects of preheating and type of electrode (E8010 and E8018) on microstructure and mechanical properties of 5L X70 steel welded joints were investigated. The microstructure of joint zone and fracture surface was analyzed by light optical microscope and scanning electron microscope equipped with energy dispersive spectroscopy. Hardness mapping and tensile test were also performed to find the relationship between microstructure and mechanical properties. The results showed a consistency between the hardness variation data and the microstructure of joint zone. Moreover, hardness mapping revealed coarse and fine grain subregions in the heat affected zone which were not detected in the micrographs. The tensile test indicated that the non-preheated sample, welded by cellulosic E8010, had the minimum value in the strength and the ductility of welded steel. The fractography also determined that size and distribution of strengthening phases affected the fracture mode of welded specimens.
APA, Harvard, Vancouver, ISO, and other styles
30

Lal, Shyam, Sudhir Kumar, and Zahid A. Khan. "Microstructure evaluation, thermal and mechanical characterization of hybrid metal matrix composite." Science and Engineering of Composite Materials 25, no. 6 (November 27, 2018): 1187–96. http://dx.doi.org/10.1515/secm-2017-0210.

Full text
Abstract:
AbstractIn this paper, an inert gas assisted electromagnetic stir casting process is adapted for manufacturing a cast hybrid metal matrix composite (MMC) using Al2O3 and SiC particulates as a hard phase reinforcement in Al 7075 alloy metal matrix. Four different samples containing 5, 10, 15 and 20 wt% of Al2O3 and SiC with Al 7075 alloy composites were fabricated. The characterizations for all the samples were carried out through optical microstructure, scanning electron microscopy (SEM) fractograph, X-ray diffraction (XRD) analysis, differential thermal analysis (DTA) analysis and mechanical properties. The results revealed that the particles are uniformly distributed in the matrix. No peaks of Al4C3 were found. There is negligible loss of material in the composite. The tensile strength and microhardness of the hybrid composite are higher by 65.7% and 13.5%, respectively, when compared to its cast metal matrix Al 7075 alloy.
APA, Harvard, Vancouver, ISO, and other styles
31

Munir, Badrul, Suryadi, and Bintang Suryo. "Contribution of Galvanizing Layer to Hydrogen Induced Cracking Failure of AISI 4140 Bolt for Padeye Fixing in Marine Environment." Advanced Materials Research 789 (September 2013): 502–6. http://dx.doi.org/10.4028/www.scientific.net/amr.789.502.

Full text
Abstract:
A high strength bolt with hot dip galvanizing treatment failed shortly after being installed for two days on a padeye of mooring dolphin. The bolt was installed with increasing stress on the second day in which the value was nearly twice. Investigation results showed the bolt fractured with the nut head separated from the pin. Corroded fracture surface with brittle characteristic and no plastic deformation observed dominating the failed area. Characterization of hardness and chemical composition followed with microstructure and fractography observation on the fracture surface then conducted in order to analyze the reason for this brittle fracture occurrence. Results indicate that, while the bolt conforms to the material specification in term of chemical composition, the hardness value was high. The microstructure observation reveals a transgranular crack propagation and cleavage failure occurred. The cleavage failure was clearly observed under fractography observation using scanning electron microscope. Failed galvanize layer due to mechanical failure becomes preferential site for hydrogen evolution in marine environment, which leads to hydrogen diffusion into the matrix, thus results in hardness increase. The increasing stress during installation become detrimental to the bolt and facilitate the hydrogen induce cracking. Detrimental effect of hot dip galvanize layer is pointed out in the application of high strength material in marine environment.
APA, Harvard, Vancouver, ISO, and other styles
32

Durmuş, Ali, Hakan Aydın, Mümin Tutar, Ali Bayram, and Kurtuluş Yiğit. "Effect of the microstructure on the notched tensile strength of as-cast and austempered ductile cast irons." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 9 (January 3, 2012): 2214–29. http://dx.doi.org/10.1177/0954406211433248.

Full text
Abstract:
In this study, the effect of microstructure on the mechanical properties of four types of ductile cast irons with different morphologies was investigated using circumferentially notched cylindrical specimens with different notch root radii. These cast irons were also austempered using the same austempering heat treatment to make a comparison with the as-cast samples. Characterization of the specimens has been carried out by means of microstructure, hardness, tensile properties, notch tensile strength, notch sensitivity, fracture toughness, and fractography. A mixture of ferrite and pearlite in the microstructure of cast irons gives rise to a material of the highest tensile strength, notch tensile strength, and fracture toughness properties with the intermediate ductility and notch sensitivity. A higher pearlite in the matrix of cast irons gives very important mechanical properties such as hardness and strength, but brittleness of the matrix andnotch sensitivity are greatly increased. Austempering significantly increased the mechanical properties and also reduced the difference between the mechanical properties of the cast irons. Austempered ferritic ductile irons exhibited the highest notch tensile strength and fracture toughness, and the high tensile strength and the intermediate ductility properties with the lowest notch sensitivity, whereas austempered pearlitic ductile irons had the lowest tensile strength, ductility, notch tensile strength, fracture toughness, and the intermediate notch sensitivity properties. The mechanical properties of the as-cast and austempered ductile irons have increased almost linearly with increase in the notch root radius.
APA, Harvard, Vancouver, ISO, and other styles
33

Onchi, T., K. Dohi, N. Soneda, J. R. Cowan, R. J. Scowen, and M. L. Castaño. "Fractographic and microstructural characterization of irradiated 304 stainless steel intergranularly fractured in inert gas." Journal of Nuclear Materials 320, no. 3 (August 2003): 194–208. http://dx.doi.org/10.1016/s0022-3115(03)00105-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

Sozańska, Maria, Adrian Mościcki, and Tomasz Czujko. "The Characterization of Stress Corrosion Cracking in the AE44 Magnesium Casting Alloy Using Quantitative Fractography Methods." Materials 12, no. 24 (December 9, 2019): 4125. http://dx.doi.org/10.3390/ma12244125.

Full text
Abstract:
In this work an assessment of the susceptibility of the AE44 magnesium alloy to stress corrosion cracking in a 0.1M Na2SO4 environment is presented. The basic assumed criterion for assessing the alloy behavior under complex mechanical and corrosive loads is deterioration in mechanical properties (elongation, reduction in area, tensile strength and time to failure). The AE44 magnesium alloy was subjected to the slow strain rate test (SSR) in air and in a corrosive environment under open circuit potential (OCP) conditions. In each variant, the content of hydrogen in the alloy was determined. The obtained fractures were subjected to a quantitative evaluation by original fractography methods. It was found that under stress corrosion cracking (SCC) conditions and in the presence of hydrogen the mechanical properties of AE44 deteriorated. The change in the mechanical properties under SCC conditions in a corrosive environment was accompanied by the presence of numerous cracks, both on fracture surfaces and in the alloy microstructure. The developed method for the quantitative evaluation of cracks on the fracture surface turned out to be a more sensitive method, enabling the assessment of the susceptibility of AE44 under complex mechanical and corrosive loads in comparison with deterioration in mechanical properties. Mechanical tests showed a decrease in properties after SSRT tests in corrosive environments (UTS ≈ 153 MPa, ε = 11.2%, Z = 4.0%) compared to the properties after air tests (UTS ≈ 166 MPa, ε = 11.9%, Z = 7.8%) but it was not as visible as the results of quantitative assessment of cracks at fractures (number of cracks, length of cracks): after tests in corrosive environment (900; 21.3 μm), after tests in air (141; 34.5 μm). These results indicate that the proposed new proprietary test methodology can be used to quantify the SSC phenomenon in cases of slight changes in mechanical properties after SSRT tests in a corrosive environment in relation to the test results in air.
APA, Harvard, Vancouver, ISO, and other styles
35

Azimi, Amin, Gbadebo Moses Owolabi, Hamid Fallahdoost, Nikhil Kumar, Horace Whitworth, and Grant Warner. "AA2219 Aluminum Alloy Processed via Multi-Axial Forging in Cryogenic and Ambient Environments." Journal of Materials Science Research 8, no. 2 (March 6, 2019): 1. http://dx.doi.org/10.5539/jmsr.v8n2p1.

Full text
Abstract:
This paper presents the microstructure and the mechanical behavior of nanocrystalline AA2219 processed by multi axial forging (MAF) at ambient and cryogenic temperatures. The X-ray diffraction pattern and transmission electron microscopy micrographs in the initial microstructure characterization indicate a more effective severe plastic deformation during the cryogenic MAF than the same process conducted at room temperature. MAF at cryogenic temperature results in crystallite size reduction to nanoscales as well as second phase particles breakage to finer particles which are the crucial factors to increasing the mechanical properties of the material. Fractography analysis and tensile tests results show that cryogenic forging does not only increase the mechanical strength and toughness of the alloys significantly, but also improves the ductility of the material in comparison with the conventional forging. In this comparative regard, cryogenic processing provides 44% increase in the tensile strength of the material only after 2 forging cycles when compared to the room temperature process. In addition, further forging process to the next cycles slightly enhances the tensile strength at the expense of ductility due to less ability of the dislocations to accumulate. However, the ductility of the ambient temperature forged samples decreases at a faster rate than that of cryoforged samples.
APA, Harvard, Vancouver, ISO, and other styles
36

Castrillo, P. D., D. Olmos, H. J. Sue, and J. González-Benito. "Mechanical characterization and fractographic study of epoxy–kaolin polymer nanocomposites." Composite Structures 133 (December 2015): 70–76. http://dx.doi.org/10.1016/j.compstruct.2015.07.040.

Full text
APA, Harvard, Vancouver, ISO, and other styles
37

Cisko, Abby, James Jordon, Dustin Avery, Tian Liu, Luke Brewer, Paul Allison, Ricolindo Carino, Youssef Hammi, Timothy Rushing, and Lyan Garcia. "Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy." Metals 9, no. 3 (March 5, 2019): 293. http://dx.doi.org/10.3390/met9030293.

Full text
Abstract:
An extensive experimental and computational investigation of the fatigue behavior of friction stir welding (FSW) of aluminum–lithium alloy (AA2099) is presented. In this study, friction stir butt welds were created by joining AA2099 using two different welding parameter sets. After FSW, microstructure characterization was carried out using microhardness testing, scanning electron microscopy, and transmission electron microscopy techniques. In particular, the metastable strengthening precipitates T1 (Al2CuLi) and δ’(Al3Li) seen in the base metal were observed to coarsen and dissolve due to the FSW process. In order to evaluate the static and fatigue behavior of the FSW of the AA2099, monotonic tensile and fully-reversed strain-controlled fatigue testing were performed. Mechanical testing of the FSW specimens found a decrease in the ultimate tensile strength and fatigue life compared to the base metal. While the process parameters had an effect on the monotonic properties, no significant difference was observed in the number of cycles to failure between the FSW parameters explored in this study. Furthermore, post-mortem fractography analysis of the FSW specimens displayed crack deflection, transgranular fracture, and delamination failure features commonly observed in other parent Al–Li alloys. Lastly, a microstructurally-sensitive fatigue model was used to elucidate the influence of the FSW process on fatigue life based on variations in grain size, microhardness, and particle size in the AA2099 FSW.
APA, Harvard, Vancouver, ISO, and other styles
38

Cheneke, Semegn, and D. Benny Karunakar. "Microstructure characterization and evaluation of mechanical properties of stir rheocast AA2024/TiB2 composite." Journal of Composite Materials 54, no. 7 (August 27, 2019): 981–97. http://dx.doi.org/10.1177/0021998319871693.

Full text
Abstract:
In this research, microstructure and mechanical properties of stir rheocast AA2024/TiB2 metal matrix composite have been investigated. The working temperature was 640℃, which was the selected semisolid temperature that corresponds to 40% of the solid fraction. Two weight percentage, 4 wt%, and 6 wt% of the TiB2 reinforcements were added to the matrix. The field emission scanning electron microscope micrographs of the developed composites showed a uniform distribution of the particles in the case of the 2 wt% and 4 wt% of the reinforcements. However, the particles agglomerated as the weight percentages of the reinforcement increases to 6%. The optical microscope of the liquid cast sample showed the dendritic structure, whereas the rheocast samples showed a globular structure. The X-ray diffraction analysis confirmed the distribution of the reinforcements in the matrix and the formation of some intermetallic compounds. Mechanical properties significantly improved by the addition of the reinforcements in the matrix. An increase in tensile strength of 13.3%, 40%, 28%, and 5% was achieved for the unreinforced rheocast sample, 2 wt%, 4 wt%, and 6 wt% reinforced rheocast samples respectively, compared to the liquid cast sample. An increase in 20% of hardness was attained for the composite with 2 wt% TiB2 compared to the liquid cast sample. According to the fractography analysis, small dimples were observed on the fractured surface of the unreinforced rheocast sample, whereas small and large voids were dominant on the fractured surface of the 2 wt% composite, which shows the ductile fracture mode.
APA, Harvard, Vancouver, ISO, and other styles
39

Sroka, Marek, and Grzegorz Golański. "Microstructural and Mechanical Characterization of Alloys." Crystals 10, no. 10 (October 17, 2020): 945. http://dx.doi.org/10.3390/cryst10100945.

Full text
Abstract:
This Special Issue on “Microstructural and Mechanical Characterization of Alloys” features eight papers that cover the recent developments in alloys (engineering materials), methods of improvement of strength and cyclic properties of alloys, the stability of microstructure, the possible application of new (or improved) alloys, and the use of treatment for alloy improvement.
APA, Harvard, Vancouver, ISO, and other styles
40

Pan, C. "Direct fractographic and microstructural evaluation of different zones within welded dissimilar steel joints." Materials Science and Technology 21, no. 6 (June 2005): 657–64. http://dx.doi.org/10.1179/174328405x43135.

Full text
APA, Harvard, Vancouver, ISO, and other styles
41

Szafrańska, Aleksandra, Anna Antolak-Dudka, Paweł Baranowski, Paweł Bogusz, Dariusz Zasada, Jerzy Małachowski, and Tomasz Czujko. "Identification of Mechanical Properties for Titanium Alloy Ti-6Al-4V Produced Using LENS Technology." Materials 12, no. 6 (March 16, 2019): 886. http://dx.doi.org/10.3390/ma12060886.

Full text
Abstract:
This paper presents a characterization study of specimens manufactured from Ti-6Al-4V powder with the use of laser engineered net shaping technology (LENS). Two different orientations of the specimens were considered to analyze the loading direction influence on the material mechanical properties. Moreover, two sets of specimens, as-built (without heat treatment) and after heat treatment, were used. An optical measurement system was also adopted for determining deformation of the specimen, areas of minimum and the maximum principal strain, and an effective plastic strain value at failure. The loading direction dependence on the material properties was observed with a significant influence of the orientation on the stress and strain level. Microstructure characterization was examined with the use of optical and scanning electron microscopes (SEM); in addition, the electron backscatter diffraction (EBSD) was also used. The fracture mechanism was discussed based on the fractography analysis. The presented comprehensive methodology proved to be effective and it could be implemented for different materials in additive technologies. The material data was used to obtain parameters for the selected constitutive model to simulate the energy absorbing structures manufactured with LENS technology. Therefore, a brief discussion related to numerical modelling of the LENS Ti-6Al-4V alloy was also included in the paper. The numerical modelling confirmed the correctness of the acquired material data resulting in a reasonable reproduction of the material behavior during the cellular structure deformation process.
APA, Harvard, Vancouver, ISO, and other styles
42

Cosma, Cosmin, Igor Drstvensek, Petru Berce, Simon Prunean, Stanisław Legutko, Catalin Popa, and Nicolae Balc. "Physical–Mechanical Characteristics and Microstructure of Ti6Al7Nb Lattice Structures Manufactured by Selective Laser Melting." Materials 13, no. 18 (September 16, 2020): 4123. http://dx.doi.org/10.3390/ma13184123.

Full text
Abstract:
The demand of lattice structures for medical applications is increasing due to their ability to accelerate the osseointegration process, to reduce the implant weight and the stiffness. Selective laser melting (SLM) process offers the possibility to manufacture directly complex lattice applications, but there are a few studies that have focused on biocompatible Ti6Al7Nb alloy. The purpose of this work was to investigate the physical–mechanical properties and the microstructure of three dissimilar lattice structures that were SLM-manufactured by using Ti6Al7Nb powder. In particular, the strut morphology, the fracture characterization, the metallographic structure, and the X-ray phase identification were analyzed. Additionally, the Gibson-Ashby prediction model was adapted for each lattice topology, indicating the theoretical compressive strength and Young modulus. The resulted porosity of these lattice structures was approximately 56%, and the pore size ranged from 0.40 to 0.91 mm. Under quasi-static compression test, three failure modes were recorded. Compared to fully solid specimens, the actual lattice structures reduce the elastic modulus from 104 to 6–28 GPa. The struts surfaces were covered by a large amount of partial melted grains. Some solidification defects were recorded in struts structure. The fractographs revealed a brittle rupture of struts, and their microstructure was mainly α’ martensite with columnar grains. The results demonstrate the suitability of manufacturing lattice structures made of Ti6Al7Nb powder having unique physical–mechanical properties which could meet the medical requirements.
APA, Harvard, Vancouver, ISO, and other styles
43

Атрошенко, С. А., С. С. Майер, and В. И. Смирнов. "Анализ разрушения перлитной рельсовой стали с внутренней макротрещиной." Физика твердого тела 63, no. 5 (2021): 575. http://dx.doi.org/10.21883/ftt.2021.05.50803.244.

Full text
Abstract:
One of the most dangerous defects leading to transverse fractures of rails is internal transverse cracks in the rail head. In this work, a fractographic analysis of the cross-sectional surface of a rail with a transverse fatigue crack is carried out. The rail sample was taken out of work after many years of service. Microstructural analysis of the crack surface and the surrounding material shows a significant degradation of the physical and mechanical properties of the rail steel.
APA, Harvard, Vancouver, ISO, and other styles
44

Dzioba, Ihor, Sebastian Lipiec, Piotr Furmanczyk, and Robert Pala. "Investigation of Fracture Process of S355JR Steel in Transition Region Using Metallographic and Fractographic Tests and Numerical Analysis." Acta Mechanica et Automatica 12, no. 2 (June 1, 2018): 145–50. http://dx.doi.org/10.2478/ama-2018-0023.

Full text
Abstract:
Abstract In the paper are presented test results of fracture process in brittle-to-ductile transition range for two microstructural types of S355JR steel – ferrite-pearlite and ferrite-carbides. For both kinds of S355JR steel obtained in temperature range of transition region the strength and plastic properties are similar, but the fracture toughness characteristics showed significantly are various. To clarify the differences in the course of trends in the mechanical characteristics performed metallographic and fractographic observations using the scanning electronic microscope. The fractographic examination showed that changes in the fracture surface morphology were dependent on the test temperature. It was also found that during the subcritical crack growth the region of ductile fracture extension reduced with decreasing temperature. The results of finite element method (FEM) calculation the stress fields in front of the crack of single edge notch in bending (SENB) specimens in the range of brittle-to-ductile transition are presented also. The FEM calculations were performed on the numerical model of SENB specimen using the ABAQUS program.
APA, Harvard, Vancouver, ISO, and other styles
45

Schwarz, Friederike, Katja Lange, Lutz Krüger, Rudolf Kawalla, and Stephan Reichelt. "Microstructural and Mechanical Characterization of ARB AZ31." Materials Science Forum 765 (July 2013): 403–7. http://dx.doi.org/10.4028/www.scientific.net/msf.765.403.

Full text
Abstract:
In this work the influence of accumulative roll bonding (ARB) process on the microstructure and the mechanical characteristic is investigated. Therefore, AZ31 magnesium sheets were successfully deformed through ARB for a maximum of three passes. Twin roll cast sheets and twin roll cast sheets with subsequent heat treatment (480 °C, 1 h) were used as initial materials. After one ARB pass, the highest microstructure changes were measured. Electron backscattered diffraction (EBSD) reveals a bimodal microstructure with an average grain size of ~1µm. In comparison to the initial material a strong basal texture was measured. The significant refinement of grain size after severe plastic deformation cause an increase of tensile and compressive strength, e.g. rising yield stress and ultimate tensile strength of 42% and 15%, respectively. However, the maximum formability remains nearly at the same level. Further ARB passes do not improve the mechanical characteristics further.
APA, Harvard, Vancouver, ISO, and other styles
46

Kadigithala, Nagabhushan Kumar, and Vanitha C. "Effects of welding speeds on the microstructural and mechanical properties of AZ91D Mg alloy by friction stir welding." International Journal of Structural Integrity 11, no. 6 (March 13, 2020): 769–82. http://dx.doi.org/10.1108/ijsi-12-2019-0131.

Full text
Abstract:
PurposeThe main purpose of the present work is to evaluate, the microstructural and mechanical properties of friction stir welded plates of AZ91D magnesium alloy with 3 mm thickness, and to determine the optimum range of welding conditions.Design/methodology/approachMicrostructure and fractographic studies were carried out using scanning electron microscopy (SEM). Vickers micro hardness test was performed to evaluate the hardness profile in the region of the weld area. The phases in the material were confirmed by X-Ray diffraction (XRD) analysis. Transverse tensile tests were conducted using universal testing machine (UTM) to examine the joint strength of the weldments at different parameters.FindingsMetallographic studies revealed that each zone shown different lineaments depending on the mechanical and thermal conditions. Significant improvement in the hardness was observed between the base material and weldments. Transverse tensile test results of weldments had shown almost similar strength that of base material regardless of welding speed. Fractographic examination indicated that the welded specimens failed due to brittle mode fracture. Through these studies it was confirmed that friction stir welding (FSW) can be used for the welding of AZ91D magnesium alloy.Research limitations/implicationsIn the present study, the welding speed varied from 25 mm/min to 75 mm/min, tilt angle varied from 1.5° to 2.5° and constant rotational speed of 500 rpm.Practical implicationsMagnesium and aluminum based alloys which are having high strength and low density, used in automotive and aerospace applications can be successfully joined using FSW technique. The fusion welding defects can be eliminated by adopting this technique.Originality/valueLimited work had been carried out on the FSW of magnesium based alloys over aluminum based alloys. Furthermore, this paper analyses the influence of welding parameters over the microstructural and mechanical properties.
APA, Harvard, Vancouver, ISO, and other styles
47

Атрошенко, С. А., С. С. Майер, and В. И. Смирнов. "Структурно-фазовое состояние металла рельса с внутренней трещиной после длительной эксплуатации." Журнал технической физики 91, no. 9 (2021): 1363. http://dx.doi.org/10.21883/jtf.2021.09.51215.72-21.

Full text
Abstract:
During operation, under cyclic force action, various physical and mechanical processes occur over time in the rail metal: plastic deformation of the rolling surface, the formation of internal and surface cracks, a change in residual stresses, etc. As a result, the mechanical characteristics deteriorate and the performance of the rails decreases. In this work, a microstructural analysis of the cross-sectional surface of two rails with internal cracks - longitudinal and transverse. Rail samples were taken out of service after many years of service. Fractographic analysis of the crack surface and the surrounding material indicates a significant degradation of the physical and mechanical properties of rail steel.
APA, Harvard, Vancouver, ISO, and other styles
48

Rajasekaran, R., AK Lakshminarayanan, M. Vasudevan, and P. Vasantharaja. "Role of welding processes on microstructure and mechanical properties of nuclear grade stainless steel joints." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 11 (May 14, 2019): 2335–51. http://dx.doi.org/10.1177/1464420719849448.

Full text
Abstract:
Nuclear grade 316LN austenitic stainless steel weld joints were fabricated using conventional gas tungsten arc welding (GTAW), activated flux gas tungsten arc welding (AGTAW), laser beam welding (LBW) and friction stir welding (FSW) processes. Assessment of weld beads was done by mechanical and metallurgical characterizations. Bead geometry and weld zones were studied by taking macrographs along the transverse side of the weld joints. Metallurgical features of different weld joints were carried out using optical microscopy and scanning electron microscopy. Microhardness distribution across four weld joints was recorded and hardness variations were compared. All weld zone, heat affected zone (HAZ) of GTAW and LBW, thermo-mechanically affected zone (TMAZ) of FSW processes, exhibited higher hardness values than the base metal. Reduced hardness was recorded at HAZ of AGTAW process. This was the result of a considerable grain growth. LBW joint showed the highest hardness value at the center of the fusion zone due to fine equiaxed dendrite morphology. Tensile and impact properties of different welding processes were evaluated and comparisons were made at room temperature. All weld samples displayed high yield strength (YS) and ultimate tensile strength (UTS) with a lower percentage of elongation compared to that of the base metal. FSW joint showed improved YS, UTS and impact toughness compared to other weld joints. This is attributed to the formation of strain-free fine equiaxed grains at stir zone around 5 µm in size with subgrains of 2 µm in size by severe dynamic recrystallization mechanism. Among the fusion welding techniques, AGTAW process exhibited improved toughness, besides almost equal toughness of the base metal due to low δ-Ferrite with high austenite content. Fractography studies of the base metal and different weld samples were carried out by SEM analysis and features were compared.
APA, Harvard, Vancouver, ISO, and other styles
49

Ralph, Brian. "Microstructural characterization of failures." Materials Characterization 26, no. 4 (June 1991): 211–24. http://dx.doi.org/10.1016/1044-5803(91)90013-t.

Full text
APA, Harvard, Vancouver, ISO, and other styles
50

Morri, A., L. Ceschini, M. Pellizzari, C. Menapace, F. Vettore, and E. Veneri. "Effect of the Austempering Process on the Microstructure and Mechanical Properties of 27MnCrB5-2 Steel." Archives of Metallurgy and Materials 62, no. 2 (June 1, 2017): 643–51. http://dx.doi.org/10.1515/amm-2017-0094.

Full text
Abstract:
AbstractThe effect of austempering parameters on the microstructure and mechanical properties of 27MnCrB5-2 steel has been investigated by means of: dilatometric, microstructural and fractographic analyses; tensile and Charpy V-notch (CVN) impact tests at room temperature and a low temperature.Microstructural analyses showed that upper bainite developed at a higher austempering temperature, while a mixed bainitic-martensitic microstructure formed at lower temperatures, with a different amount of bainite and martensite and a different size of bainite sheaf depending on the temperature. Tensile tests highlighted superior yield and tensile strengths (≈30%) for the mixed microstructure, with respect to both fully bainitic and Q&T microstructures, with only a low reduction in elongation to failure (≈10%). Impact tests confirmed that mixed microstructures have higher impact properties, at both room temperature and a low temperature.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Mechanical microstructural and fractographic characterization' for other source types:
Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography