Homogenization heat treatment of Mg-7.0 wt%Y-1.0 wt%Nd-0.5 wt%Zr alloy  

作　　者：Jing-Bao Liu Kui Zhang Jing-Tao Han Xing-Gang Li Yong-Jun Li Ming-Long Ma Jia-Wei Yuan Meng Li 

机构地区：[1]State Key Laboratory for Fabrication and Processing of Nonferrous Metals,Beijing General Research Institute for Nonferrous Metals,Beijing 100088 China [2]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Rare Metals》2020年第10期1196-1201,共6页稀有金属（英文版）

基　　金：financially supported by the National Basic Research Program of China(No.2013CB632202)。

摘　　要：The microstructures and mechanical properties of Mg-7.0 wt%Y-1.0 wt%Nd-0.5 wt%Zr magnesium alloy were investigated both in as-cast condition and after homogenization heat treatment by differential scanning calorimetry(DSC),optical microscopy(OM),X-ray diffraction(XRD),scanning electron microscopy(SEM)and hardness measurement.The results indicate that the ascast alloy consists ofα-Mg matrix,Mg24 Y5 and Mg41 Nd5 phases,which are eutectic phases(cubic Y-rich phase).With the increase in homogenization temperature and time,the Mg24 Y5 and Mg41 Nd5 phases are completely dissolved into matrix,and only yttrium of intermetallic compounds leaves around boundary.After homogenization heat treatment,the elements distributed uniformly and the grains grow up not obviously,only yttrium element of intermetallic compounds left around boundary.The optimum homogenization condition is at 537℃for 16 h.The mechanical properties are improved after homogenization,with tensile strength ofσb=181 MPa,yielding strength ofσ(0.2)=144 MPa and elongation ofδ=5.5%,which are better than those of as-cast alloy.

关 键 词：Rare earth magnesium alloy HOMOGENIZATION Microstructure HARDNESS 

分 类 号：TG166.4[金属学及工艺—热处理]