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《Special Casting & Nonferrous Alloys》 2010-12
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Microstructure and Mechanical Properties of Mg-4Zn-0.5Er-1Y Magnesium Alloy Sheet

Wang ZhongJun1, Li Zhifeng1, Wang Yanan1, Yang Qingxiang2, Ma Pengcheng1, Cai Chuanbo1 (1. School of Material and Metallurgy, Key Laboratory for Materials Forming and Microstructure & Properties Control, University of Science and Technology Liaoning, Anshan, China; 2. School of Materials Science and Engineering, Yanshan University, Qinhuangdao, China)  
Microstructure evolution and mechanical properties of rolled Mg-4Zn-0.5Er-1Y alloy sheets with annealing at 200~380℃ for 0.5~4 h were investigated. It is found that distinct dynamic recrystallization grain with fine size can be observed in the annealed alloy sheets. Amounts of secondary phase containing RE exist in the matrix alloy, which are broken into fine particle after hot rolling to promote the heterogeneous nucleation of dynamic recrystallization grain. Strength of the alloy sheet after annealing treatment is decreased with the obvious improvement of plasticity. The alloy sheet with approximately 8 μm in size exhibits desirable mechanical properties with annealing at 350℃ for half hour, such as tensile strength of 276MPa and elongation of 22.5%. Activation energy of grain boundary migration reaches 22.76kJ/mol. In addition, kinetics model of dynamic recrystallization grain growth was established.
【Fund】: 辽宁省教育厅高校科研项目(2008329) 辽宁省教育厅材料成型与组织性能控制重点实验室开放式基金项目(200909);; 鞍山市科技局项目(2008SF54);; 辽宁科技大学大学生科研训练计划项目(2010年第6期)
【CateGory Index】: TG146.22
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