Microstructure modification and precipitation strengthening for Mg−6Zn−1Mn−4Sn−0.5Ca through extrusion and aging treatment

作     者：Xia CHEN Ding-fei ZHANG Yang ZHAO Jing-kai FENG Bin JIANG Fu-sheng PAN 陈霞;张丁非;赵阳;冯靖凯;蒋斌;潘复生

作者机构：College of Materials Science and EngineeringChongqing UniversityChongqing 400045China National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044China Chongqing Academy of Science and TechnologyChongqing 401123China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2020年第30卷第10期

页      面：2650-2657页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Project(2016YFB0301101)supported by the National Key Research and Development Program of China Projects(51571040,U1764253,51531002)supported by the National Natural Science Foundation of China 

主　　题：Mg−6Zn−1Mn−4Sn−0.5Ca extrusion aging microstructure precipitation strengthening 

摘      要：The microstructure revolution and mechanical properties of as-extruded and peak-aged Mg−6Zn−1Mn−4Sn−0.5Ca(ZMT614−0.5Ca)alloy were studied by OM,SEM,TEM,hardness testing and tensile *** results showed that the as-cast ZMT614−0.5Ca alloy mainly consisted of α-Mg,Mg−Zn and CaMgSn *** hot extrusion process effectively refined the microstructure and led to a completely dynamic recrystallized *** average grain size of as-extruded alloy was^4.85μ*** solution treatment,remained CaMgSn with high melting point played a significant role in pinning effect and impeding the migration of grain *** aging treatment,peak-aged ZMT614−0.5Ca alloy exhibited a good combination of strength and ductility,with yield strength,ultimate tensile strength and elongation being 338 MPa,383 MPa and 7.5%,*** yield strength of the alloy increased significantly by around 36%compared with that in as-extruded condition,which should be attributed to the precipitation strengthening of β phase.