Journal articles: 'AZ91D matrix'

1

Jia, Suqiu, Shu Sheng Jia, Guangping Sun, and Jun Yao. "The Corrosion Behaviour of Mg Alloy AZ91D/TiCp Metal Matrix Composite." Materials Science Forum 488-489 (July 2005): 705–8. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.705.

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The corrosion of a magnesium-based MMC, comprising a AZ91D alloy matrix and 5 vol% titanium carbide particles has been studied in saline environments, using immersion and electrochemical tests. Corrosion was localized initially and developed subsequently into general corrosion , the local corrosion rate of AZ91D/TiCp being faster than diecast AZ91D due to the formation of less protective corrosion products. Galvanic corrosion for AZ91D/TiCp, due to coupling of the matrix and reinforcement, was more severe than diecast AZ91D.

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2

Huang, Kaijin, Lin Chen, Xin Lin, Haisong Huang, Shihao Tang, and Feilong Du. "Wear and Corrosion Resistance of Al0.5CoCrCuFeNi High-Entropy Alloy Coating Deposited on AZ91D Magnesium Alloy by Laser Cladding." Entropy 20, no. 12 (November 30, 2018): 915. http://dx.doi.org/10.3390/e20120915.

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In order to improve the wear and corrosion resistance of an AZ91D magnesium alloy substrate, an Al0.5CoCrCuFeNi high-entropy alloy coating was successfully prepared on an AZ91D magnesium alloy surface by laser cladding using mixed elemental powders. Optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction were used to characterize the microstructure of the coating. The wear resistance and corrosion resistance of the coating were evaluated by dry sliding wear and potentiodynamic polarization curve test methods, respectively. The results show that the coating was composed of a simple FCC solid solution phase with a microhardness about 3.7 times higher than that of the AZ91D matrix and even higher than that of the same high-entropy alloy prepared by an arc melting method. The coating had better wear resistance than the AZ91D matrix, and the wear rate was about 2.5 times lower than that of the AZ91D matrix. Moreover, the main wear mechanisms of the coating and the AZ91D matrix were different. The former was abrasive wear and the latter was adhesive wear. The corrosion resistance of the coating was also better than that of the AZ91D matrix because the corrosion potential of the former was more positive and the corrosion current was smaller.

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Wang, Xiao Ying, Yu Tao Zhao, Gang Chen, Song Li Zhang, and Xiao Nong Cheng. "In Situ Fabrication and Properties of Mg₂Si/AZ91D Magnesium Matrix Composites." Advanced Materials Research 150-151 (October 2010): 1640–43. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1640.

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Mg2Si/AZ91D magnesium matrix composites are fabricated from AZ91D-Al2(SiO3)3 system by direct melt reaction method. The effects of the variation Al2(SiO3)3 addition contents to the microstructures and mechanical properties of the composites are investigated. The results show that the amounts of Mg2Si particles are increased and the structures of AZ91D magnesium alloy are refined with the Al2(SiO3)3 content increasing. When the additional content of Al2(SiO3)3 is 3wt.%, the tensile strength of the composite reaches 178.6MPa, which is increased by nearly 14.5% than that of AZ91D matrix alloy.

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Tian, Jun. "Effect of Fiber Volume Fraction on High Temperature Creep of Al₂O₃-SiO₂(sf)/AZ91D Composite." Key Engineering Materials 474-476 (April 2011): 548–52. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.548.

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Constant stress tensile creep tests were conducted on AZ91D–20 vol.%, 25 vol.%, and 30 vol.% Al2O3-SiO2short fiber composites and on an unreinforced AZ91D matrix alloy. The creep resistance of the reinforced materials is shown to be considerably improved compared with the matrix alloy. With the increasing volume fraction of short fibers, the creep resistance of AZ91D composites is improved, and their creep threshold stresses are also increased accordingly. Because of the increasing volume fraction of short fibers, loads of bearing and transmission of short fibers will increase, and thus the creep resistance of AZ91D composites further improves, but the precipitation of β-Mg17Al12precipitate increases in the number, it is easy to soften coarse, so that threshold stress of AZ91D composite does not increase greatly.

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Xia, Cun Juan, Ming Liang Wang, Hao Wei Wang, and Cong Zhou. "The Effect of Aluminum Content on TiO₂ Coated Carbon Fiber Reinforced Magnesium Alloy Composites." Applied Mechanics and Materials 488-489 (January 2014): 30–35. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.30.

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The interface between the reinforcement and the matrix is significant to metal matrix composites. The effect of aluminum (Al) content on interfacial microstructure and mechanical properties of TiO2coated carbon fiber reinforced magnesium matrix composites by squeeze casting technique have been studied (C/Mg). Mg-2wt%Al and AZ91D were used as alloy matrix. The obtained results indicate that the carbon fibers in both kinds of composites are well protected by TiO2coating, without any interfacial brittle carbide phase observed. The flexural strength of Cf-TiO2/AZ91D (1009MPa) composites is 26.5% lower than that of Cf-TiO2/Mg-2Al (1277MPa) composites. The lath-shaped precipitates of Mg17Al12in AZ91D composites lead to the mechanical properties decrease.

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Yu, Si Rong, Zhi Qiu Huang, and Jia An Liu. "Thermodynamics of In Situ Formation of Mg₂Si and MgO in AZ91D /Flyash Composites." Materials Science Forum 686 (June 2011): 378–81. http://dx.doi.org/10.4028/www.scientific.net/msf.686.378.

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Novel AZ91D Mg alloy/fly-ash cenospheres (AZ91D/FAC) composites were fabricated by melt stir technique. The thermodynamic analyses of the interfacial reactions, the microstructure observation, and the phase analyses of the AZ91D/FAC composites were investigated. The results showed that the cenospheres were almost filled with Mg alloy matrix. In-situ MgO and Mg2Si phases were formed in Mg alloy matrix and near the interfaces between the cenospheres and Mg alloy matrix. Through the thermodynamic calculation, it can be found that the standard free enthalpy changes of these interfacial reactions are all negative at the temperature of Mg alloy melt preparation in this work, and these reactions can occur.

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7

Li, Changyun, Erkuo Yang, Ling Tang, Yang Li, and Lei Xu. "Compression Properties and Fabrication of Closed-Cell Metal Matrix Syntactic Foams Al2O3hs/AZ91D." Materials 15, no. 19 (October 3, 2022): 6873. http://dx.doi.org/10.3390/ma15196873.

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Closed-cell metal syntactic foam is a new material consisting of hollow spheres embedded in metal matrix syntactic foams. These foams have good physical and mechanical properties and are increasingly used worldwide in industrial and high-tech fields. Magnesium matrix syntactic foams containing hollow Al2O3 spheres ((Al2O3hs)/AZ91D) were successfully fabricated by hot press sintering at different temperatures. The fabrication of Al2O3hs/AZ91D and the effect of sintering temperature on the microstructure and properties are reported in this paper. Additionally, sandwiched magnesium matrix syntactic foams were prepared by placing magnesium plates on both sides of the syntactic foam. Some Al2O3hs particles became filled with matrix particles during preparation. Thus, the actual density was greater than the theoretically calculated value and increases with increasing sintering temperature. Above 723 K, a brittle phase MgAl2O4 formed in Al2O3hs/AZ91D. The quasistatic and dynamic compressive strengths of Al2O3hs/AZ91D first increased and then decreased with increasing sintering temperature, and the maximums were 162 MPa and 167.87 MPa, respectively. Thus, this paper reports a new strategy for the controlled preparation of metal matrix syntactic foams with predetermined porosity. The results show that this strategy improved the performance of lightweight and high-strength syntactic foam materials and shows potential for further research.

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8

Raju, G. U., Vinod Kumar V. Meti, N. R. Banapurmath, T. M. Yunus Khan, I. G. Siddhalingeshwar, Vishal Vaikunte, Chandramouli Vadlamudi, Sanjay Krishnappa, A. M. Sajjan, and Adarsh Patil. "Effect of Multi-Walled Carbon Nanotubes and Carbon Fiber Reinforcements on the Mechanical and Tribological Behavior of Hybrid Mg-AZ91D Nanocomposites." Materials 15, no. 17 (September 5, 2022): 6181. http://dx.doi.org/10.3390/ma15176181.

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Magnesium matrix composites are extensively used in automotive and structural applications due to their low density, high strength, and wear-resistant properties. To reach the scope of industry needs, research is carried out regarding enhancing the mechanical and tribological behavior of the magnesium composites by reinforcing the nano-sized reinforcements. In the present work, research has been carried out to enhance the properties of the magnesium AZ91D hybrid composite by reinforcing carbon fibers (CFs) and multi-walled carbon nanotubes (MWCNTs) with varying weight percentages (AZ91D + 0.5% CF’s + 0.5% MWCNT and AZ91D + 0.75% CF’s + 0.75% MWCNT, respectively). The experimental tests were carried out to evaluate the mechanical and tribological behavior of the composites. The test results showed that the addition of CF and MWCNT reinforcements improved the hybrid Mg composite’s hardness, tensile strength, and impact strength compared to the base Mg matrix. The AZ91D + 0.75% CF’s + 0.75% MWCNT hybrid composite showed a 19%, 35%, and 66% increased hardness, tensile strength, and impact strength, respectively, compared to the base Mg AZ91D. The wear test results also showed the improved wear resistance of the Mg composite compared to the base matrix. The enhanced wear resistance of the composite is due to the addition of hard MWCNT and CF reinforcements. The wear rate of the AZ91D + 0.75%CF’s + 0.75% MWCNT composite for a load of 30 N at a sliding distance of 1500 m is lower as compared to the base matrix. The SEM micrographs of the worn surfaces revealed the existence of abrasive wear. The improved mechanical and tribological behavior of the magnesium composite is also due to the homogeneous distribution of the hard reinforcement particles along the grain boundaries.

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9

Gobara, Mohamed, and Mohamed Shamekh. "Corrosion behavior of in situ (TiC-TiB2)p/AZ91 magnesium matrix composites in Harrison solution." Anti-Corrosion Methods and Materials 61, no. 5 (August 26, 2014): 319–27. http://dx.doi.org/10.1108/acmm-04-2013-1258.

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Purpose – This paper aims to study both the mechanical properties and the corrosion behavior of the synthesized in situ (TiC-TiB2) particulates/AZ91 magnesium matrix composite and compare the results with that of the conventional AZ91D alloy. Design/methodology/approach – Scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were used to study the surface morphology and crystalline structure. Mechanical compression tests were used to investigate the mechanical performance according to ASTM E9-89a. The corrosion behavior of the synthesized magnesium alloy was examined using both electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques in dilute Harrison solutions. Findings – The microstructure of the Mg composite showed a uniform distribution of reinforcing phases. Also, the reinforcing phases were formed without residual intermediate phases. The addition of titanium and boron carbides not only enhanced the mechanical properties of the matrix but also improve its corrosion behavior. Originality/value – This is the first time that magnesium matrix composite has been to synthesized with TiC and TiB2 particulates starting from starting from Ti and B carbides powder without adding aluminium using practical and low-cost technique (in situ reactive infiltration technique). This paper studies the corrosion behavior of synthesized Mg matrix in dilute Harrison solution and compares the results with that of conventional AZ91D.

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Huang, Song Jeng, Yo Zhi Dai, and Yeau Ren Jeng. "Volume Fraction Effects of Silicon Carbide on the Wear Behavior of SiC_p-Reinforced Magnesium Matrix Composites." Advanced Materials Research 152-153 (October 2010): 11–18. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.11.

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This paper investigated the volume fraction effect of micro-sized SiC on the tribological behavior of SiCp reinforced AZ91D Mg-based metal-matrix composites (MMCs). The Mg MMCs were prepared by the melt-stirring technique for wear tests. The hardness and coefficient of friction of Mg MMCs increase as increasing volume fraction of SiC particle in MMCs. The SiCp/AZ91D MMCs exhibit superior wear resistance under lower and moderate sliding condition. However, the effects of the SiC particle reinforcements on wear resistance are not as conclusive under severe sliding condition (50N-1500 rpm for all vol.% of MMCs, 50N-1000rpm for 3 vol. % MMCs), since the matrix of MMCs were softened at elevated temperature under such severe condition. However, the incorporation of SiC particles could enhance the wear resistance of AZ91D matrix alloy for most of the sliding conditions.

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11

Tang, Bin, Shuang Shou Li, Man Qiong Xu, and Da Ben Zeng. "Effects of Ca Addition into AZ91D Alloy on Structure and Tensile Fracture Behavior." Applied Mechanics and Materials 79 (July 2011): 25–28. http://dx.doi.org/10.4028/www.scientific.net/amm.79.25.

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The influences of Ca addition (<1.2wt %) on structure and tensile fracture behavior of AZ91D alloy were investigated in this article. These results indicated that Ca addition can both form Al2Ca phase on interdendritic boundary and refine grain size. Ca addition evidently increases the yield strength but decreases the elongation of AZ91D alloy. The crack initiations of the AZ91D alloy and Ca-contained alloy both occur at the edges between the interdendritic eutectics and the α-Mg matrix. Failure of AZ91D alloy is brittle quasi-cleavage fracture, while Ca addition makes the failure tend to be cleavage.

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12

Yao, Huan, Zhiyong LI, Yingqiao Zhang, Shouzheng Wei, Gangdong Xu, Shuai Yan, and Jieliang Ren. "Study on laser cladding system of the high-entropy alloy layer on the AZ91D magnesium." Journal of Laser Applications 34, no. 3 (August 2022): 032007. http://dx.doi.org/10.2351/7.0000680.

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A new type of composite layer material system, Al4Ni/Al2CrCuFeNi2Ti high-entropy alloy, was designed. The Al4Ni transition layer was prepared on the surface of an AZ91D magnesium alloy by laser cladding, which solves the problem of excessive melting point difference between the magnesium alloy and the high-entropy alloy. The Al4Ni/Al2CrCuFeNi2Ti high-entropy alloy composite layer with good surface formation was successfully prepared on the AZ91D magnesium matrix. Optical microscope, scanning electron microscope, and x-ray diffraction were used to characterize the microstructure and properties of the composite layer. It showed that the high-entropy alloy layer was mainly composed of simple BCC and FCC solid solution phases. The Al2CrCuFeNi2Ti high-entropy alloy layer, the Al4Ni layer, and the AZ91D magnesium matrix have excellent metallurgical bonds. The hardness of the high-entropy alloy layer was about 12 times that of the AZ91D magnesium alloy. The corrosion resistance of the high-entropy alloy layer in 3.5 wt. % NaCl was also improved.

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13

Zhou, Ji Ming, Le Hua Qi, Hai Bo Ouyang, and He Jun Li. "Mechanical Properties of Csf/AZ91D Composites Fabricated by Extrusion Forming Process Directly Following the Vacuum Infiltration." Advanced Materials Research 89-91 (January 2010): 692–96. http://dx.doi.org/10.4028/www.scientific.net/amr.89-91.692.

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Magnesium matrix composites are attractive for weight critical application, such as automotive and aerospace components, because of its high specific strength and stiffness. Extrusion process directly following vacuum infiltration (EVI) can eliminate the porosity and obtain the well-aligned and uniform fiber distribution during the fabrication of Csf/AZ91D composite. This process combines the advantages of gas pressure infiltration, squeeze casting, and semi-solid extrusion. The mechanical properties of the magnesium are improved greatly by introducing the carbon fibers into the magnesium matrix through the EVI process. In the present study, the carbon short fiber reinforced magnesium matrix composites Csf/AZ91D were fabricated by EVI process. The microstructure and tensile property of Csf/AZ91D composites were investigated. The results showed that the microstructure of the composite presented a uniform distribution of carbon short fibers in the matrix and good interfacial integrity. The yield strength and stiffness of the composites increased with increasing carbon short fiber content, but at the cost of ductility. Nonetheless, Csf/AZ91D can keep relatively high ductility during the improvement of strength compared with reported composites in the literatures. Increasing carbon fiber content in the composite was not always beneficial to the ultimate tensile strength at the same magnitude. When the fiber content exceeds 10%, the matrix was not strengthened as greatly as under 10% fiber content. The yield strength improvement was attributed to (i) load-bearing effects due to the presence of carbon short fiber reinforcements; (ii) grain size refinement due to the large extrusion deformation; (iii) generation of dislocations to accommodate CTE mismatch between the matrix and the particles.

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14

Suo, Xin Kun, Xue Ping Guo, Wen Ya LI, Marie Pierre Planche, Chao Zhang, and Han Lin Liao. "Microstructure and Wear Behavior of SiC_P-Reinforced Magnesium Matrix Composite by Cold Spraying." Advanced Materials Research 314-316 (August 2011): 253–58. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.253.

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In this paper, dense AZ91D/SiC composite coatings were fabricated by cold spraying. The microstructure and microhardness of the as-sprayed coatings were investigated. The results show that the content of SiC particles in the composite coating was 23.6 ± 7.5 vol.%. The microhardness of the composite coating was improved to 140 HV0.3 due to the enhancement of SiC particles, compared to 98 HV0.3 for the pure AZ91D coating. The wear behavior of the composite coating in an ambient condition was studied through a ball-on-disc dry sliding test system. The composite coating showed higher friction coefficient and lower wear rate than the pure AZ91D coating. The wear mechanism of the composite coating was discussed.

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Hao, Xi, Weixin Hao, Guihong Geng, Teng Ma, Chen Wang, Fuqiang Zhao, Hao Song, and Yugui Li. "Effects of High-Density Pulse Currents on the Solidification Structures of Cu-SiCp/AZ91D Composites." Advances in Materials Science and Engineering 2019 (April 3, 2019): 1–6. http://dx.doi.org/10.1155/2019/1684580.

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In this study, Cu-SiCp/AZ91D composites were prepared with high-density pulse currents. The wettability between SiCp and matrix during solidification was improved by coating 0.095-μm thick copper film on the surface of SiCp. By comparing the composites prepared with/without pulse currents, the solidification structure and its formation mechanism of Cu-SiCp/AZ91D composites were analyzed under different conditions. The Cu-SiCp/AZ91D composites prepared without high-density pulse currents were mainly composed of α-Mg, β-Mg17Al12, and a small amount of Mg2Si phases, with coarse grains and uneven structures. Under the action of high-density pulse currents, the structures of Cu-SiCp/AZ91D composites were transformed into α-Mg and Mg2Si phases with refined grain, and the homogeneity of the structures was improved significantly.

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Azadi, Mat Akhir Khalid, M. Z. M. Zamzuri, S. Norbahiyah, and Mohd Nazree Derman. "Characteristic and Corrosion Studies of Rare Earth (REE) Based Anodizing on AZ91D Magnesium Alloy." Key Engineering Materials 594-595 (December 2013): 571–74. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.571.

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Oxide coatings on AZ91D magnesium alloy were prepared using anodizing technique with 10mA/cm2 current density for 5 minutes in electrolyte containing Mg (NO3)2 with NaVO3 as an additive. The corrosion behaviors of different coatings condition were evaluated by immersion test in 5.0% NaCl electrolyte for 72 hours. The microstructures were analyzed by Optical Microscope (OM) and Scanning Electron Microscope (SEM). It was found that coatings with the addition of NaVO3 produced homogeneous primary α-matrix and bigger β-phase (Mg17Al12) compared to untreated AZ91D magnesium alloy. The oxide film formed by anodizing in electrolyte with NaVO3 enhances the corrosion resistance of the AZ91D magnesium alloy significantly.

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Azadi, Mat Akhir Khalid, M. Z. M. Zamzuri, S. Norbahiyah, M. R. N. Liyana, M. Marina, K. Alir, and M. N. Derman. "Characteristic and Corrosion Studies of Rare Earth (Ree) Based Anodizing on AZ91D Magnesium Alloy." Advanced Materials Research 879 (January 2014): 38–42. http://dx.doi.org/10.4028/www.scientific.net/amr.879.38.

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Oxide coatings on AZ91D magnesium alloy were prepared using anodizing technique with 10mA/cm2 current density for 5 minutes in electrolyte containing La (NO3) and Mg (NO3),with NaVO3 as an additive. The corrosion behaviors of different coatings condition were evaluated by immersion test in 5.0% NaCl electrolyte for 72 hours. The microstructures were analyzed by Optical Microscope (OM) and Scanning Electron Microscope (SEM). It was found that coatings with the addition of NaVO3 produced homogeneous primary α-matrix and bigger β-phase (Mg17Al12) compared to untreated AZ91D magnesium alloy. The oxide film formed by anodizing in electrolyte with NaVO3 enhances the corrosion resistance of the AZ91D magnesium alloy significantly

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Zhang, Jin, Yan Ling Tao, and Zhi Fu Sun. "Microstructure of AZ91D in Different Treatment Conditions." Materials Science Forum 546-549 (May 2007): 143–46. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.143.

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The microstructures of magnesium alloy AZ91D in as-cast, solid solution and aging conditions were studied by optical, scanning electron and transmission electronic microscopes. The relationship between microstructure and the microhardness was analyzed. It has been found that the microhardness in the matrix varied slightly with the increasing solution time, but increased quickly with the aging time. The difference of the microhardness between the matrix and the second phase in as-cast condition is larger than that in T6 aging condition, because the aluminum-zinc-magnesium (poor) phase existed in the as-cast condition.

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Zhou, Ji Ming, Hai Ming Meng, Li Jun Han, and Le Hua Qi. "Mechanical Properties of CNTS-Grafted Carbon Fiber/Magnesium Composites Prepared by Liquid-Solid Infiltration Extrusion." Solid State Phenomena 285 (January 2019): 121–26. http://dx.doi.org/10.4028/www.scientific.net/ssp.285.121.

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CNTs-grafted carbon fiber reinforced magnesium composites (CNTs-Cf/Mg) were successfully prepared by liquid-solid infiltration extrusion process, in which the carbon fiber cross-ply preform were grafted with carbon nanotubes (CNTs) by using the injection chemical vapor deposition (ICVD) technique. The mechanical properties of AZ91D matrix alloy and magnesium matrix composite at different states were tested and compared. The results show that the dendrites of the as-cast AZ91D alloy are transformed into granular grains after liquid-solid forming. The composite reinforced by carbon fiber with grafting nanotubes is beneficial to the one reinforced with carbon fiber but without grated CNTs. The nanotubes grafted on carbon fiber improve the bonding property of the fiber-matrix interface and protect the carbon fiber from degradation more effectively. The tensile strength of the CNTS-Cf/Mg composites is 28.3% higher than the Cf/Mg composites.

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Tharaknath, S., and I. Rahamathullah. "Mechanical, chemical, metallurgical characteristics under HBSS solution and optimization of AZ91D-Ti functional graded composites using TOPSIS." Bulletin of the Chemical Society of Ethiopia 37, no. 1 (October 26, 2022): 77–89. http://dx.doi.org/10.4314/bcse.v37i1.7.

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ABSTRACT. Functional graded magnesium matrix composites (FGMMCs) are widely employed for biomedical, aerospace and thermal barrier applications because of their better mechanical properties, biocompatibility and bioactivity. In this study, AZ91D-wt. %Ti (x = 0, 4, 8, 12 and 16) composites are fabricated by ex-situ centrifugal casting method. The NaCl based solution is sprayed on all fabricated magnesium composites for 72 hours at the 1 kg/cm3 pressure spray and 6.9 pH value in salt spray chamber. The microhardness and flexural strength of fabricated composites are determined. The corrosion resistance of AZ91D-wt. %Ti fabricated composites is determined for 21 days immersion. The AZ91D -12wt. %Ti exhibits higher microhardness, flexural strength and corrosion resistance than other produced AZ91D-Ti composites. The optimization on micro machining process parameters is done on the AZ91D-12wt. %Ti with the help of Technique for order of preference by similarity to ideal solution (TOPSIS).The input process parameters are selected as cutting rate, feed rate, depth of cut and tool type and the response parameters are selected as feed force, normal force, tool wear rate, burr height and surface roughness. The computed optimal micro milling process parameters are at 120 m/min cutting speed, 0.5 µm feed rate, 0.15 mm depth of cut and the TiB2 coated tool. KEY WORDS: AZ91D -Ti, TOPSIS, Surface roughness, Tool wear loss, Cutting force Bull. Chem. Soc. Ethiop. 2023, 37(1), 77-89. DOI: https://dx.doi.org/10.4314/bcse.v37i1.7

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Li, Wei Xue, Yun Feng Nie, and Dun Dong Wang. "Mechanical Behavior of CNTs/SiCp/AZ91D Magnesium Matrix Composites." Materials Science Forum 694 (July 2011): 635–39. http://dx.doi.org/10.4028/www.scientific.net/msf.694.635.

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AZ91D alloy composites reinforced by CNTs/SiCp were fabricated using stir casting process. The mechanical properties of the composites were tested, observed and analyzed the microstructure, the fractographs were observed and analyzed via scanning electron microscope. The results showed that CNTs/SiCp could not only refine the grains of the composites, but also bear the load of resistance to deformation. Compared with the matrix alloy, the tensile strength, the elastic modulus, the micro-hardness and the elongation rate of the composites had been enhanced significantly. But the mechanical properties would be fell down with the more addition of CNTs/SiCp.

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HUANG, S. J., and Z. W. CHEN. "Grain refinement of AlNp/AZ91D magnesium metal-matrix composites." Metallic Materials 49, no. 04 (2011): 259–64. http://dx.doi.org/10.4149/km_2011_4_259.

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Ma, Xiao Chun, Jian Cheng Hu, and Ying Qi Tao. "Research on Forming Process of Anodic Oxide Film of AZ91D Magnesium Alloy." Advanced Materials Research 476-478 (February 2012): 34–37. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.34.

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The matrix of AZ91D Magnesium alloy can be covered with a coat of protective film through anodic oxidation treatment, it’s able to make certain that the optimal surface combination properties are generated especially on corrosion resistance. This thesis is devoted to the research on forming process of anodic oxide film of AZ91D magnesium alloy; the experiment shows the formation of anodic oxide film at constant pressure is accompanied by precipitation of gases and fluctuation of current, XRD indicates that anodic oxide film is composed of MgO、γ-Al2O3 and a small amount of Si.

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Liu, Guan Jun, Xin Ning, Wen Qing Zhang, and Ze Tong Yu. "Effect of Sliding Speed on Wear Property of Al₂O₃-SiO₂_(sf) / AZ91D Composite." Advanced Materials Research 217-218 (March 2011): 893–96. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.893.

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AZ91D alloy matrix composites(MMCs) with volume fraction of 15%, 20%, 25% and 30% were prepared with the preform made of crystallized aluminum silicate short fibers as reinforcement and aluminum phosphate as binder by squeezing casting at high temperature. Dry sliding wear properties of the composites were tested by means of MM200 wear tester (block-on-ring configuration) against a hardened alloy steel counterface with hardness of 53HRC under loads of 10N, 20N, 30N, 40N and 50N and sliding speed of 0.47m/s and 0.92 m/ s, and wear morphology of the specimens was observed by SEM (scanning electron microscope). The results reveal that effects of sliding speed on wear rate of the composites are greater and more complex than on those of the AZ91D matrix alloy, which is closely related to not only volume fraction in the composites but also applied loads.

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Kaya, Ali Arslan, E. S. Kayali, Dan Eliezer, G. Gertsberg, and N. Moscovitch. "Addition of B₄C to AZ91 via Diecasting and Its Effect on Wear Behaviour." Materials Science Forum 488-489 (July 2005): 741–44. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.741.

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The dry sliding wear behavior of magnesium-matrix-composites (MMC) reinforced by boron carbide particulates (B4Cp) has been investigated. Magnesium is the lightest structural material and is a good choice as a metal matrix for boron carbide and silicon carbide addition. Magnesium and its alloys, without reinforcement, are generally not suitable for mechanical applications due to their low wear resistance. The MMCs used in this study were produced via highpressure die-casting technique. The wear resistance of B4C/AZ91D composite reinforced with 12 and 25 wt% B4C were studied, compared with unreinforced diecast AZ91D. As-cast microstructures of the materials and boron carbide particules were characterized by using Scanning Electron Microscopy (SEM). The hardness values of the control sample and the composites were determined via Vickers hardness measurements. Pin on disk dry sliding wear tests were carried out to study wear rate and wear mechanisms. The magnesium matrix composites were used as pins while mild steel as disc material. The worn surfaces of pins were examined by using SEM. The wear performance of magnesium matrix composites was improved with increasing volume fraction of B4C up to a certain level.

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Lin, Na, Kai Huai Yang, Shao Feng Zeng, and Wen Zhe Chen. "Study on Dynamic Strain Aging Phenomenon of AZ91D Magnesium Alloy." Advanced Materials Research 472-475 (February 2012): 2962–65. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2962.

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Tensile experiment of AZ91D magnesium alloy was carried out and serrated flow was apparent throughout the deformation history. Dynamic strain aging (DSA) occurs when the AZ91D magnesium alloy treated by solid solution treatment has been deformed at a set range of strain rates (1.11×10-4 s-1 to1.67×10-3 s-1) and a certain range temperatures (248 K to 423 K). The critical plastic strain εc was observed to increase with increasing strain rates but decrease with increasing temperature. The diffusing activation energy of solute atoms during the DSA occurring in AZ91D magnesium alloy is 140.8 kJ/mol by calculating, which is correspondence match with the diffusing activation energy of Al solute atoms in Mg matrix. Therefore, the micro-mechanism of DSA in the alloy is believed that the Al atoms in solid solution gather around dislocations to form Cottrell solute atmospheres by vacant diffusion and then pin the moving dislocations.

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Gao, Xin, Kejian Geng, Cuicui Sun, Suqing Zhang, Jixue Zhou, Jianhua Wu, Xinfang Zhang, and Xitao Wang. "Effects of Graphite Particle Content and Holding Time on the Microstructure and Mechanical Properties of the Graphite/AZ91D Composite." Metals 13, no. 1 (December 25, 2022): 57. http://dx.doi.org/10.3390/met13010057.

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The effects of Grp (graphite particles) addition and holding time on the microstructure and mechanical properties of the Grp/AZ91D composite were investigated in this work. The results indicated that the distribution of Grp in the matrix was determined by the self-stabilizing mechanism and relationships between the solidifying interface and the particles. Due to the self-stabilizing mechanism, a small amount of Grp would uniformly distribute in the melt alloy, and as the amount of Grp increased, agglomeration would occur. Accordingly, the former would be engulfed by the solidifying interface and the latter would be pushed. With an increased holding time, Grp tended to agglomerate, due to the interfacial reaction that occurred, and as a result, the solidifying interface will push it. The Grp/AZ91D composite with the addition of 1.5 wt.% Grp and a holding time of 15 min obtained grains 30.2 μm in size with a hardness of 89.07 HV, which was a decrease of 83.04% and increase of 35.06% compared to AZ91D, respectively.

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Meng, Guanghui, T. M. Yue, Xin Lin, Haiou Yang, Hui Xie, and Xu Ding. "Laser surface forming of AlCoCrCuFeNi particle reinforced AZ91D matrix composites." Optics & Laser Technology 70 (July 2015): 119–27. http://dx.doi.org/10.1016/j.optlastec.2015.02.001.

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Xu, Pei Quan, Jiang Wei Ren, and Hong Ying Gong. "Microstructure Characterization of AZ91D Magnesium Alloy Weldment Using Tungsten Inert Arc Welding Method." Advanced Materials Research 322 (August 2011): 31–34. http://dx.doi.org/10.4028/www.scientific.net/amr.322.31.

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The problem during magnesium alloy welding is the key bottleneck of magnesium application in aerospace, aircraft, automotive and other industries. AZ91D magnesium welded joint is obtained using tungsten inert gas (TIG) welding method without filler materials and groove. The microstructure, morphology, composition and micro hardness distribution of welded joint are investigated using scanning electronic microscopy (SEM), EDAX and micro hardness experiment. The results show: (1) Well welded joint of AZ91D magnesium alloy using TIG welding method is obtained under the condition of welding current 152A, welding voltage 13.4V, welding velocity 6.5mm/s and 20L/min Argon shielding gas; (2) Microstructure of welded joint consisted of black matrix phase α-Mg, white eutectic α+Mg17Al12 and gray dendrite.

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Lin, Ying Nan, Jian Yih Wang, and Shyong Lee. "Effect of Annealing Treatment on Solid State Recycled Magnesium Alloy AZ91D." Materials Science Forum 544-545 (May 2007): 243–46. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.243.

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A practical and important idea regarding solid state recycling of magnesium alloys is explored. Chips of AZ91D have been put in hot air environment for accelerated oxidation to simulate the to-be-recycled state of Mg alloy scraps. These chips materials received extrusion process and subsequent annealing treatment. Tensile tests showed that the extruded plate had higher strength than that of ordinary die cast counterpart. Micro-structure investigation indicated it was probably due to finer grains of the Mg matrix as a result of extrusion. Further annealing did not seem to alter this fine structure, yet it could diminish some un-favored form of Mg17Al12 compound. Thus, post-annealed solid state recycled AZ91D showed impressive strengths and elongations.

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Yang, Xiang Jie, and Hua Lan Jin. "Phosphate and Stannate Chemical Conversion Coatings Formed on AZ91D Alloys." Materials Science Forum 610-613 (January 2009): 1407–13. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.1407.

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The morphology and the mass change of the AZ91D alloys matrix after pretreatment, the morphology and the phase composition of chemical conversion coatings formed by phosphate and stannate were studied using scanning electron microscope, X-ray diffraction and the mass loss method. The corrosion resistance of the coatings were studied by salt spay test and damp heat test. The results show that the phase composition of matrix before and after pretreatment is almost changeless and the mass diminishes a litter, the deep micro flaw appears near between α-Mg and β phase during acidic pickling. The phosphate chemical conversion coating is mainly composed of Mg, MgO and some amorphous phase, and the stannate conversion coating is crystal structure and mainly composed of Mg, Al12Mg17 and MgSnO3•3H2O. Results from salt spay test and damp heat test indicate that the two coatings also can provide good protection for the magnesium alloy matrix, and stannate is better than phosphate.

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Liu, Shi Ying, Fei Peng Gao, Qiong Yuan Zhang, and Wen Zhen Li. "Mechanical Properties and Microstrutures of Nano-Sized SiC Particles Reinforced AZ91D Nanocomposites Fabricated by High Intensity Ultrasonic Assisted Casting." Materials Science Forum 618-619 (April 2009): 449–52. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.449.

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A high intensity ultrasonic assisted casting method was used to fabricate SiC nanoparticles reinforced magnesium matrix nanocomposites (n-SiCp/AZ91D). The microstructures and mechanical properties of the nanocomposites were investigated. The results show that n-SiCp are well dispersed in the matrix and the grain size was refined. A HRTEM study of the interface between n-SiCp and the matrix suggests that SiC bonds well with matrix without forming an intermediate phase. With the lower addition of n-SiCp, the mechanical properties of nanocomposites are greatly improved. As compared to an unreinforced magnesium alloy matrix, the tensile and yield strength were improved by 43.6% and 117% respectively.

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Li, Dong Nan, Wen Zhe Chen, and Jun Tian. "Effect of Heat Treatment on Microstructure and Mechanical Properties of Semi-Solid Formed Magnesium Alloy AZ91D." Advanced Materials Research 148-149 (October 2010): 346–52. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.346.

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The semi-solid slurry of AZ91D magnesium alloy was prepared by twin-screw stirring mixer, the microstructure and mechanical properties of semi-solid formed magnesium alloy AZ91D produced by rheo-diecasting and conventional liquid die casting were investigated, respectively. The strengthen mechanism of the semi-solid formed magnesium alloy after heat treatment was analysed by EDS. The results show that the mechanical properties of semi-solid formed magnesium alloy can be enhanced markedly by T4 and T6 heat treatment, owing to decrease of the porosity and less segregation in casting, brittle eutectic compounds dissolves gradually into α-Mg matrix, and the primary phase α-Mg decomposes in the course of heat treatment. In as-cast state, the tensile strength, elongation and hardness of semi-solid formed magnesium alloy AZ91D are 222MPa, 2.3% and 74 HBS, respectively. In T4 heat treatment state, the tensile strength and elongation are increased by 13% and 210%, and in T6 heat treatment state, the tensile strength and hardness are increased by 11% and 16%. The mechanical properties of castings formed by conventional liquid die casting are deteriorated distinctly after T6 heat treatment due to its porosity and crack defects.

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Wu, Shu Sen, Ming Zhao, Ji Rong Luo, and You Wu Mao. "Properties of Conversion Coating of Magnesium Alloys by a Phosphate-Permanganate Solution." Materials Science Forum 488-489 (July 2005): 665–68. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.665.

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A chromium-free conversion coating for AZ91D magnesium alloys has been obtained by using a phosphate-permanganate solution. Examinations have been carried out on the conversion coating for morphology, composition, adhesion force and corrosion resistance. Results show that the conversion coatings are relatively uniform and continuous, with thickness from 7µm to 10µm. They exhibit good adhesion to matrix and have some non-penetrate tiny holes on the surface. The main elements of the conversion coating of AZ91D alloy are Mg、O、P、K、Al、Mn. Results of corrosion resistance test indicate that the corrosion resistance of the conversion coating by phosphate-permanganate solution is in match to that of the conversion coating formed in a chromate solution, but for the corrosion resistance after painting, the former is better than the later.

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35

Chi, C. T., C. G. Chao, C. A. Huang, and C. H. Lee. "Investigation of Electron Beam Welding on AZ91D-F Extrusive Plates." Materials Science Forum 505-507 (January 2006): 193–98. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.193.

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Electron beam welding (EBW) is currently the most advanced jointed technology because of its superior welding precision and larger depth-width ratio than other conjunctive methods. The high vacuum environment of EBW is favorable for the welding of magnesium alloys to prevent the active metals from oxidation. In this study, a home-made 11mm-thick AZ91D extrusive plate was used. By operating and comparing the changeable welding parameters, the optimum condition has been determined as 113mA, 40kV, 73.3mm/s and focal position at bottom. 82% and 89% of the matrix material strength were obtained by stress and non-stress concentration weldments, respectively. Under other worse parameters, the reduction of the strength of EBW for AZ91D-F resulted from four factors, which were undercuts, heat affected zone (HAZ), hot cracking, and cavities.

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Chen, Shilong, Meng Wang, Lin Sun, and Yantao Yao. "Characterization of (B4C+Ti) Hybrid Reinforced Mg and AZ91D Composites." Crystals 12, no. 8 (August 6, 2022): 1105. http://dx.doi.org/10.3390/cryst12081105.

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Ceramic hybrid particulate reinforced magnesium matrix composites have attracted much attention in recent years, owing to their light weight, high specific strength and stiffness, excellent wear and damping properties, and have very wide popularization and application prospects in the automotive and aerospace fields. A simple and novel technique, in situ reactive infiltration technique, was utilized to prepare (B4C+Ti) hybrid reinforced Mg and AZ91D composites. The microstructure, produced phases, wear, compression and bending performance were characterized and analyzed in depth. The results showed that extending the holding time for preparing the composites and magnesium alloy as the matrix were both beneficial for the generation of interpenetrating networks within the composites, which means more sufficient and complete in situ reactions between B4C and Ti particles. More sufficient and complete reactions facilitate stronger interfacial bonding, leading to an improvement of the wear, compression and bending performance of the composites. The wear mechanisms for both kinds of composites were abrasive and delamination wear. (B4C+Ti)/AZ91D composites exhibit better compression performance and this can be attributed to the microstructure of the composites and work-hardening and softening during compression.

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Zhou, Xinjun, Zhengfu Zhang, Xiulan Li, Liyu Zhou, Xudong Zhang, and Manjiao Chen. "Microstructure and Phase Evolution Characteristics of the In Situ Synthesis of TiC-Reinforced AZ91D Magnesium Matrix Composites." Materials 15, no. 4 (February 9, 2022): 1278. http://dx.doi.org/10.3390/ma15041278.

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TiC-reinforced AZ91D magnesium alloy composites were synthesized through the in situ reaction between an AZ91D melt and Ti-C-Al preforms. The microstructural evolution characteristics and phase transformation were investigated at different melt reaction temperatures (1013, 1033, and 1053 K), with the aim of understanding the in situ formation mechanism of TiC particles from thermodynamic and kinetic perspectives. The results showed that the temperature played a critical role in determining the formation and morphology of TiC. Initially, only the Al3Ti phase was formed through the reaction between Ti and Al when the temperature was 1013 K. With the increase in the melt temperature, the A13Ti’s thermodynamic stability decreased, and dissolution and precipitation reactions occurred at higher temperatures (1033 and 1053 K, respectively), contributing to the formation of TiC particles. The formation of the TiC phase was attributed to two factors: Firstly, A13Ti as an intermediate product reacted with carbon and formed TiC with increasing temperature. Secondly, the in situ TiC reaction was promoted due to the increased reaction-driving force provided by the increasing temperature.

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38

Zhang, Jin Ling, Xi Tao Wang, Yong He, and Yan Li Wang. "Microstructural Evolution of Rheo-Diecast AZ91D Magnesium Alloy with Gadolinium Addition." Materials Science Forum 654-656 (June 2010): 667–70. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.667.

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The rheo-diecasting (RDC) process, a novel semi-solid processing technology, was used to produce cast components with high integrity, fine and uniform microstructure, and therefore enhanced performance. AZ91D samples with 1-3 mass%Gd were solidified by RDC process. It was found that under intensive forced convection, the primary α-Mg phase produced inside the twin-screw slurry maker had fine particle size, spherical morphology and uniform distribution throughout the samples. Microstructure observations showed that Gd addition resulted in the formation of Al2Gd which dispersed in the α-Mg matrix. The size and amount of β-Mg17Al12 phase was reduced and its continuity was broken, which was the main reason for improving mechanical properties of the AZ91D alloy at high temperatures. The amount of Al2Gd particles increased with increasing Gd addition. From EPMA quantitative analysis, almost all Gd reacted with Al, leading to the low concentration of Gd in the α-Mg matrix. The Vickers hardness increased monotonously from HV=50.4 to HV=67.3 with increasing amount of Gd. This improvement was attributed to the consummation of aluminum in melt by precipitation of the Al2Gd phases.

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39

Chen, Hang, Xuan Pu Dong, Xiao Qing Xiong, Rong Ma, Shu Qun Chen, and Zi Tian Fan. "Damping Properties of AZ91D Magnesium Alloy with Y Addition." Advanced Materials Research 476-478 (February 2012): 3–10. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.3.

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The influence of Y on the microstructure and damping capacity of AZ91D based alloys was investigated by optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and dynamic mechanical analysis. The results show that, with increasing Y content, the grain size of α-Mg matrix decreases tremendously and the distribution of β-Mg17Al12 phase is transformed from discontinuous network to fine particles. Meanwhile, a needle-shaped Al4MgY phase mainly distributing at the grain boundaries is identified. The damping capacity of the studied alloys shows sustained enhancement with increasing temperature. As to the strain dependent damping capacity, with the increase of Y content, the damping value of AZ91D alloy decreases gradually before Y content reaches to 0.5wt.%, and fluctuates when Y addition is between 0.5wt.%~0.9wt.%. G-L dislocation model was employed to explain the effects of parameters on damping capacity of magnesium alloy.

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40

Wang, Zhao Hui, Bo Li, Xian Du, Ke Liu, Shu Bo Li, and Wen Bo Du. "Microstructure and Mechanical Properties of AIN Particles Reinforced Magnesium Matrix Composites with In Situ Synthesis Process." Solid State Phenomena 256 (September 2016): 181–85. http://dx.doi.org/10.4028/www.scientific.net/ssp.256.181.

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In this paper, In Situ AlN particles reinforced magnesium matrix composites were fabricated. The results show that the AlN phases can be In Situ synthesized in AZ91D alloy with the addition of Mg3N2. The microstructure and phases of the matrix alloys and the composites were investigated by OM, SEM and XRD. The hardness and mechanical properties of the matrix alloys and the composites were also obtained. Compared with those of the matrix alloy, the grains of composites were refined obviously and the mechanical properties of composites were improved significantly. The microstructural analysis indicates that the AlN particles can act as the heterogeneous nucleation of α-Mg phases in the composites. The strengthening mechanism of the composites with AlN particles was discussed.

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41

Sasaki, Gen, Makoto Yoshida, Nobuyuki Fuyama, and Toshio Fujii. "Modeling of compocasting process and fabrication of AZ91D magnesium alloy matrix composites." Journal of Materials Processing Technology 130-131 (December 2002): 151–55. http://dx.doi.org/10.1016/s0924-0136(02)00712-4.

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42

Fritzsch, Katja, Anja Buchwalder, and Rolf Zenker. "Dry Sliding Wear Behavior of EB Surface-Alloyed and Dispersed AZ91 Magnesium Alloy under Mild Wear Conditions." Materials Science Forum 828-829 (August 2015): 272–78. http://dx.doi.org/10.4028/www.scientific.net/msf.828-829.272.

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This paper reports on investigations of the beneficial effects of electron beam alloying (EBA) and electron beam dispersion alloying (EBDA) on the wear behavior of AZ91D Mg alloy under mild wear conditions with applied normal loads of 1…10 N. The layers generated had a thickness of 1.5 mm with Al contents of 30 wt.%. For dispersion alloyed layers, TiC was added with particle sizes of 20…100 µm. At a sliding distance of 20 m, the wear rates of alloyed layers (150 HB) and dispersion alloyed layers (180 HB) were almost the same and could be reduced by half compared to the untreated AZ91D (60 HB). Due to their large size and the large spaces between them, TiC particles were pressed into the layer matrix, or were torn out and acted as additional abrasives. Therefore, at a sliding distance of 50 m, the wear rate of dispersion alloyed layers increased to the level of the base material.

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43

Rajamani, D., A. Tamilarasan, Balasubramanian Esakki, and K. Ananthakumar. "Synthesis and Characterization of Sintered AZ91D Magnesium Matrix Composites Reinforced with Red Mud particles." Material Science Research India 13, no. 2 (November 14, 2016): 95–100. http://dx.doi.org/10.13005/msri/130205.

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Magnesium AZ91D alloy is reinforced with red mud particles, is the by-product of alumina which is extracted from refining of bauxite throughbayer process to fabricate low cost novel composite by powder metallurgy technique. Reinforcement ratio was varied from 0% to 15% whereas size of the particles were kept as 30µm.The microstructure and mechanical properties such as density and microhardness of the composite were evaluated. Microstructural characterization of the sintered composite revealed a near uniform distribution of the red mud particulates with magnesium alloy metal matrix.The test results indicated that the increase in weight % of red mud particles significantly enhances the mechanical propertiesof the composite.

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44

Wang, W. G., K. Matsugi, H. Fukushima, and G. Sasaki. "Interfacial Reaction in AZ91D Magnesium Alloy Matrix Composite Reinforced with Aluminum Borate Whisker." MATERIALS TRANSACTIONS 48, no. 7 (2007): 1948–54. http://dx.doi.org/10.2320/matertrans.mer2007032.

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45

Ling, Yang, Hou Hua, Zhao Yuhong, and Yang Xiaomin. "Microstructure and Mechanical Properties of Squeeze Casting Quasicrystal Reinforced AZ91D Magnesium Matrix Composites." Rare Metal Materials and Engineering 45, no. 8 (August 2016): 1978–82. http://dx.doi.org/10.1016/s1875-5372(16)30157-6.

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46

Shamekh, Mohammed, Martin Pugh, and Mamoun Medraj. "Processing and Characterization of In Situ (TiC-TiB2)p/AZ91D Magnesium Matrix Composites." Advanced Engineering Materials 15, no. 8 (March 14, 2013): 708–17. http://dx.doi.org/10.1002/adem.201200203.

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47

Li, Wei Xue, Shu Guang Du, Jian Feng Dai, and Qing Wang. "Finite Element Analysis of Interfacial Stress of Mg-Baced Composites Reinforced with Short Fiber." Advanced Materials Research 295-297 (July 2011): 954–57. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.954.

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In elastic deformation range, this paper reports a finite element study of effect of length and diameter of the fiber on intrfacial stress of AZ91D metal matrix composites reinorced by short fiber. The nuit cell model is developde in ansys. It was found no infuence the fiber length has on the interfacial regions. There is considerable increase in intefacial von-Mises stress near the fiber end with increase in fiber diameter, and the region of stress transfer become wider. So, the risk of crack and debonding increase.

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48

Song, Guang Ling, Amanda L. Bowles, and David H. StJohn. "Effect of Aging on Yield Stress and Corrosion Resistance of Die Cast Magnesium Alloy." Materials Science Forum 488-489 (July 2005): 709–12. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.709.

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Corrosion resistance is an important property that could be affected by the ageing process. In order to investigate whether aging affects the corrosion resistance, corrosion rate and yield strength of diecast magnesium alloy AZ91D were measured and analysed after ageing. It was found that the dependence of the corrosion rate on ageing time can be ascribed to the changes in microstructure of the alloy and chemical composition of its matrix. Precipitation of the β phase (Mg17Al12) occurred along the grain boundaries during the initial ageing stages, resulting in a decreasing corrosion rate and an inceasing yield strength. In the later stages, the decreasing aluminium content in the a matrix made it more active, causing an increase in the corrosion rate. The decrease in aluminium content in the matrix also leads to a decrease in yield strength.

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Anbuchezhiyan, G., B. Mohan, and R. V. Karthikeyan. "Development of Magnesium Matrix Syntactic Foams Processed through Powder Metallurgy Techniques." Applied Mechanics and Materials 766-767 (June 2015): 281–86. http://dx.doi.org/10.4028/www.scientific.net/amm.766-767.281.

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The presence of Hollow particles instead of gas porosity provides a closed cell structure called Syntactic foams. Syntactic foams have gained significant attention in recent years due to their low density, moisture absorption and thermal expansion coefficient compared to other cellular materials, such as open and closed cell structured foams. In terms of mechanical behavior, it is generally more insightful to compare metal matrix syntactic foams with metal foams and metal matrix composites. In comparison with metal foams, they have high compressive yield strength and more homogenous mechanical properties but usually higher densities and lower plasticity. In comparison with metal matrix composites, they have lower strength but offer compressibility, which is not existence in metal matrix composites. Syntactic foams have been extensively studied for aluminum based metal matricesand polymer matrices. Importance in magnesium foams is increasing in recent periods due to their very low density. Only a few studies are available on magnesium matrix syntactic foams processed through powder metallurgy techniques. This review presents an overview of hollow particle filled magnesium matrix (AZ91D/microballons) syntactic foams using powder metallurgy methods.

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Balasubramanian, I., R. Maheswaran, V. Manikandan, Nilesh Patil, M. Ayyanar Raja, and Ranganath M. Singari. "Mechanical Characterization and Machining of Squeeze Cast AZ91D/SiC Magnesium based Metal Matrix Composites." Procedia Manufacturing 20 (2018): 97–105. http://dx.doi.org/10.1016/j.promfg.2018.02.014.

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Journal articles on the topic 'AZ91D matrix'

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