Correlation between microstructure and tensile properties in powder metallurgy AZ91 alloys |
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| Authors: | Zhenya Zhang Huashun Yu Gang Chen Hui Yu Changzheng Xu |
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| Affiliation: | 1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China;2. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan, 250061, China;3. Baosteel Research Institute, BaoShan Iron & Steel Co., LTD., Shanghai, 201900, China;1. Research Center for Strategic Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan;2. Department of Mechanical Engineering, Doshisha University, 1-3 Miyakodani, Tatara, Kyotanabe 610-0321, Japan;3. Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai, Kobe, 657-8501, Japan;1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;1. Research Center for Structural Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. Advanced Materials Engineering Division, Toyota Motor Corporation, 1200 Mishuku, Susono, Shizuoka 410-1193, Japan;1. State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. Chongqing Academy of Science and Technology, Chongqing 401123, China;3. Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China;4. Chongqing Chang-an Automobile Co., Ltd., Chongqing 400023, China;1. Research Center for Structural Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. Advanced Materials Engineering Division, Toyota Motor Corporation, 1200 Mishuku, Susono, Shizuoka 410-1193, Japan |
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| Abstract: | The ultrafine-grained (0.3–1.3 μm) AZ91 alloys, which were fabricated by powder extrusion in the range of 200 to 350 °C and subsequent aging at 100 °C for 8 h, exhibit a remarkable yield stress of 360–478 MPa and moderate tensile elongations of 6–8%. A composite structure was developed after extrusion with uniform β (Mg17Al12) particles dispersed in magnesium matrix. The extrusion temperature has an indirect role on yield stress since partial dissolution of β particles induced by high extrusion temperature fails to retard grain growth. Moreover, the strength was further enhanced by the formation of nano-scale precipitates during artificial aging. The high strength could be attributed to a combination effect of grain refinement, particle reinforcement and precipitation hardening. |
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