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

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.

发文机构：State Key Laboratory of Non-Ferrous Metals and Processes GR1MAT Engineering Institute Co. General Research Institute for Non-Ferrous Metals Southwest Technology and Engineering Research Institute National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials

关键词：Mg-Cd-Y-Zn-ZralloyLPSOphaseMicrostructureMechanicalpropertiesStrengtheningmechanismRareearths

分类号： TG1[金属学及工艺—金属学]