Microstructures and strengthening mechanisms of Mg-8.2Gd-4.6Y-1.5Zn-0.4Zr alloy containing LPSO,β’ and γ type phases  

作　　者：Xiangsheng Xia Kui Zhang Minglong Ma Ting Lie 

机构地区：[1]State Key Laboratory of Non-Ferrous Metals and Processes,GRINM Co.,Ltd,Beijing 700088,China [2]GR1MAT Engineering Institute Co.,Ltd.,Beijing 101400,China [3]General Research Institute for Non-Ferrous Metals,Beijing 100088,China [4]Southwest Technology and Engineering Research Institute,Chongqing 400039,China [5]National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials,China United Test&Certification Co.,Ltd.,GRINM Group Co.,Ltd.,Beijing 100088,China

出　　处：《Journal of Rare Earths》2020年第10期1119-1125,I0004,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (51501015;51871195)。

摘　　要：The microstructures and strengthening mechanisms of the Mg-8.2 Gd-4.6 Y-1.5 Zn-0.4 Zr(wt%) alloy with long-period stacking ordered(LPSO),β’ and γ type phases were systematically studied.The results show that the LPSO with lamellar and block structures forms near the grain boundaries.The grains are clearly refined,and the 18 R LPSO phase is oriented along the extrusion direction after extrusion.Some particles also precipitate from the Mg matrix dynamically.The extruded alloy exhibits a remarkable agehardening response,and mechanical properties,with a tensile strength(TS) of 449 MPa,yield strength(YS) of 362 MPa,and elongation of 7.9% obtained in the peak-aged alloy.The strengthening mechanisms of the alloy in different states are discussed.Grain boundary and precipitation strengthening are the main strengthening mechanisms for the peak-aged alloy.

关 键 词：Mg-Cd-Y-Zn-Zr alloy LPSO phase Microstructure Mechanical properties Strengthening mechanism Rare earths 

分 类 号：TG146.22[一般工业技术—材料科学与工程]