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On the improved tensile strength and ductility of Mg-Sn-Zn-Mn alloy processed by aging prior to extrusion

查看全文 作　　者：Liping [1,2]Zhong;Yongjian [1,2]Wang;Yuchen [1,2]Dou 高影响力作者 机构地区：[1]College of Materials Science and Engineering,Sichuan University of Science&Engineering,Zigong 643000,China;[2]Material Corrosion and Protection Key Laboratory of Sichuan province,Zigong 643000,China高影响力机构 出　　处：《Journal of Magnesium and Alloys》索引2019年第7卷第4期,共11页高影响力期刊 基　　金：The authors are grateful for the financial supports from the Sichuan Science and Technology Program(2019YJ0478);the Research Foundation for the introduction of talent of Sichuan University of Science and Engineering,China(Grant Nos.2017RCL18 and 2017RCL35);the Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan Province,China(Grant Nos.2017CL05,2017CL06 and 2018CL06)。 摘　　要：This study investigated the influence of aging prior to extrusion(APE)on the tensile strength and ductility of as-extruded Mg-8.32Sn-1.85Zn-0.17Mn alloy.Results demonstrated that APE treatment dramatically increased the volume fraction of recrystallized grains,thereby decreasing the grain size of the as-extruded alloy.This phenomenon was primarily attributed to the particle-stimulated nucleation and pinning effect induced by large amounts of small Mg 2 Sn precipitates produced by the APE treatment and dynamic precipitation.The tensile yield strength increased from 242.4 MPa to 256.5 MPa after APE treatment.The improved tensile strength can be attributed to the enhanced grain boundary strengthening and precipitation strengthening.The ductility of the as-extruded alloy also markedly increased from 7.1%to 13.5%after the APE treatment.The improved ductility of APE alloy was attributed to the texture randomization,the activity of pyramidalslip and the suppressed formation of{10-11}contraction twins and coarse Mg 2 Sn phases. 关 键 词：Mg-Sn based alloy Aging prior to extrusion Microstructure Mechanical properties
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