Homogenization heat treatment of Mg-7.68Gd-4.88Y-1.32Nd-0.63Al-0.05Zr alloy

作     者：张国栋 李兴刚 马鸣龙 李永军 石国梁 袁家伟 张奎 ZHANG Guodong;LI Xinggang;MA Minglong;LI Yongjun;SHI Guoliang;YUAN Jiawei;ZHANG Kui

作者机构：State Key Laboratory for Fabrication and Processing of Non-ferrous Metals Beijing General Research Institute for Non-ferrous Metals 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2014年第32卷第5期

页      面：445-450页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 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 supported by National Natural Science Foundation of China(51204020) National Basic Research Program of China(2013CB632202,2013CB632205) Key Projects in the National Science&the Technology Pillar Program during the Twelfth Five-year Plan Period(2011BAE22B01) 

主　　题：Mg-Gd-Y-Nd-AI alloy homogenization second phase hardness rare earths 

摘      要：The microstructures and mechanical properties of the Mg-7.68Gd-4.88Y-1.32Nd-0.63A1-0.05Zr magnesium alloy were investigated both in the as-cast condition and after homogenization heat treatment from 535 to 555 ℃ in the time range 0-48 h by op- tical microscopy, scanning electron microscopy and hardness measurement. The as-cast alloy consisted of ct-Mg matrix, Mgs（Y0.5Gd0.5） phase which is a eutectic phase, strip of Al2（Y0.6Gd0.4） phase, little A13Zr and Mg（Y3Gd） phase. With the increasing of homogenization temperature and time, the Mgs（Y0.5Gd0.5） phase was completely dissolved into the matrix. The Al2（Y0.6Gd0.4） phase was almost not dissolved which impeded grain boundaries motion making the grain size almost not changed in the process of ho- mogenization. The optimum homogenization condition was 545 ℃/16 h. The tensile strength increased, yield strength decreased and the plasticity improved obviously after 545 ℃/16 h homogenization treatment.