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A review of novel ternary nano-layered MAX phases reinforced AZ91D magnesium composite

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Journal of magnesium and Alloys 2022年第6期10卷 1457-1475页

作者： Wantong Chen Wenbo Yu Chaosheng Ma Guozheng Ma Laiqi Zhang Haidou Wang Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing100083China

In recent decades, the demand for lightweight and high specific strength materials brings about the development of magnesium matrix composites. Different from some traditional binary ceramic particles, such as SiC, Al_(2)O_(3), the novel ternary nano-layered M_(n+1)AX_(n)(MAX)phase carbide or nitride ceramics exhibit metal-like properties and self-lubricate capacity(where “M” is an early transition metal, “A” belongs to the group A element, “X” is C or/and N, and n = 1–3). Ti_(2)AlC, as the representative of the MAX phase, was interestingly introduced into the magnesium matrix. Layered Ti_(2)AlC MAX phased reinforced AZ91D magnesium composites manufactured through the stir casting exhibit sufficient deformation capacity due to unique deformation behaviors of MAX, namely delamination and the formation of kinking band. Further,the Ti_(2)AlC-AZ91D composites exhibit a distinctive characteristic in strengthening mechanism, damping mechanism and tribological capacity due to the other special properties of MAX phase, such as self-lubricated property. Accordingly, to give a comprehensive understanding, we overviewed the fabrication process, microstructural characterization, mechanical properties, damping property and tribological capacity on these composites. In order to understand the A-site effect in MAX phase on the microstructure, we introduced another representative Ti_(3)SiC_(2)MAX phase to explain the interfacial evolution. In addition, due to the high aspect ratio of MAX, MAX particles could be orientationally regulated in Mg matrix by plastic deformation such as hot extrusion. Herein, we discussed the anisotropic mechanical and physical properties of the textured composites produced by hot extrusion. Moreover, the potential applications and future development trends of MAX phases reinforced magnesium matrix composites were also given and prospected.

关键词： Ternary MAX phases magnesium composite Damping Mechanical properties Anisotropic Tribological capacity

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Microstructural evolution of Mg-Al-Re alloy reinforced with alumina fibers

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Journal of magnesium and Alloys 2020年第3期8卷 565-577页

作者： Li Li Dejiang Li Xiaoqin Zeng Alan A.Luo Bin Hu Anil K.Sachdev Liangliang Gu Wenjiang Ding Shanghai Jiao Tong University ShanghaiChina The Ohio State University ColumbusOHUnited States General Motors China Science Lab ShanghaiChina General Motors Global R&D Center WarrenMIUnited States

Few studies were reported on the phases'relationships of AE44(Mg-4.0Al-4.1RE-0.3Mn,wt.%)and its composites.In this work,AE44 alloy and Saffil(6-Al2O3)/AE44 Metal matrix composite(MMC)were both prepared by slow shot high pressure die casting(SS-HPDC)technology and their phase constitutions were all studied in detail using experimental techniques combined with CALPHAD(Calculation of Phase Diagram)modeling.The results revealed that the alloy consists of the a-Mg matrix,A1hRE3 intermetallic phase,and one trace phase AI3RE,while the composite contains five major phases:a-Mg,5-AI2O3,AI3RE,MgO and Mg2Si.and two trace phases of A12RE and AI11RE3,respectively.A1hRE3 is partly derived from ALRE,while A13RE is a product of the peritectoid reaction between the two precipitates.The presence of MgO and Mg2Si is due to the interfacial reaction between the SiO2 binder in the fiber preforms and the molten magnesium during infiltration.The use of SiO2 binder in the preform manufacturing was limited/minimized to reduce the MgO formation in the MMC casting process,which can be detrimental to the fatigue performance of the MMC materials.

关键词： Mg-Al-RE magnesium composite Slow shot high pressure die casting Microstructure CALPHAD AlxREy

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Study of machining induced surface defects and its effect on fatigue performance of AZ91/15%SiCp metal matrix composite

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Journal of magnesium and Alloys 2020年第2期8卷 387-395页

作者： Nishita Anandan M.Ramulu Department of Mechanical Engineering University of WashingtonSeattleWA 98195USA

The quality of surface generated in a peripheral milling of AZ91/SiCp/15%for varying machining conditions and its effect on the fatigue performance are investigated in this study.The machined surface quality was evaluated through roughness measurements and SEM micrographs of ine machined surface.Tensile iesis were pcifumicu io iiieasure the mechanical properties of the composite.Subsequently,fatigue life of milled specimens was measured through axial fatigue tests at four loading conditions.Optical and SEM/EDS micrographs of the fractured surface were studied to identify the crack initiation site and propagation mechanism.Specimens machined at a lower feed rate of 0.1 mm/rev was found to have excellent surface finish and consequently higher fatigue life.At 0.3 mm/rev,the presence of feed marks and other surface defects resulted in a drastic decrease in fatigue life.Five distinct regions were identified on the fractured surface,particle fracture along and perpendicular to the surface,voids in the matrix due to particle debonding and pull out and typical ductile failure of matrix with embedded SiC particles.

关键词： magnesium composite Machined surface Surface integrity Fatigue

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Improving the corrosion resistance of AZ91D magnesium alloy through reinforcement with titanium carbides and borides

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Journal of magnesium and Alloys 2015年第2期3卷 112-120页

作者： Mohamed Gobara Mohamed Shamekh Robert Akid Egyptian Armed Force Kobbry ElkobbaCairoEgypt School of Materials The University of ManchesterUK

A composite consisting of magnesium matrix reinforced with a network of TiC-Ti_(2)AlC-TiB_(2)particulates has been fabricated using a practical in-situ reactive infiltration technique.The microstructural and phase composition of the magnesium matrix composite(R-Mg)was investigated using SEM/EDS and XRD.The analyses revealed the complete formation of TiC,Ti_(2)AlC and TiB_(2)particles in the magnesium matrix.Comparative compression tests of R-Mg and AZ91D alloy showed that the reinforcing particles improve the mechanical properties of Mg alloy.EIS and potentiodynamic polarization results indicated that the reinforcing particles significantly improve the corrosion resistance of the reinforced alloy in 3.5%NaCl solution.

关键词： magnesium composite EIS Compression test Passivity