Isothermal section of Mg-Zn-La system in Mg-rich corner at 400 ℃  

作　　者：黄明丽 李洪晓 任玉平 丁桦 郝士明 陈辉 

机构地区：[1]School of Materials and Metallurgy,Northeastern University [2]Traffic and Mechanical School,Shenyang Jianzhu University

出　　处：《中国有色金属学会会刊：英文版》2007年第A01期8-11,共4页Transactions of Nonferrous Metals Society of China

基　　金：Project(50471025) supported by the National Natural Science Foundation of China;Project(20052028) supported by the Natural Science Foundation of Liaoning Province, China

摘　　要：Alloys with different compositions in Mg-rich corner of Mg-Zn-La system at 400 ℃ were prepared,the phase equilibrium in the Mg-rich corner of Mg-Zn-La system was determined by scanning electron microscopy(SEM),electron probe microanalysis based on energy dispersive X-ray spectroscopy(EPMA-EDS) and X-ray diffraction(XRD),and the isothermal section at 400 ℃ was established. The results show that there exists a ternary compound(T-phase) with a constant La content and changable Mg/Zn contents in the Mg-Zn-La system. The mole fraction of La in T-phase is about 8%,and that of Zn is from 16% to 43%. There exist a two-phase equilibrium which consists of T-phase plus hcp-Mg and a three-phase equilibrium which is composed of T-phase,hcp-Mg and a liquid phase(L-phase) at 400 ℃ . The L-phase consists of 70% Mg,30% Zn and is free of La.Alloys with different compositions in Mg-rich corner of Mg-Zn-La system at 400 ℃were prepared, the phase equilibrium in the Mg-rich corner of Mg-Zn-La system was determined by scanning electron microscopy（SEM）, electron probe microanalysis based on energy dispersive X-ray spectroscopy （EPMA-EDS） and X-ray diffraction（XRD）, and the isothermal section at 400℃ was established. The results show that there exists a ternary compound （T-phase） with a constant La content and changable Mg/Zn contents in the Mg-Zn-La system. The mole fraction of La in T-phase is about 8%, and that of Zn is from 16% to 43%, There exist a two-phase equilibrium which consists of T-phase plus hcp-Mg and a three-phase equilibrium which is composed of T-phase, hcp-Mg and a liquid phase （L-phase） at 400℃. The L-phase consists of 70% Mg, 30% Zn and is free of La.

关 键 词：镁 锌 等温线 T-相位 物象平衡 

分 类 号：TG115[金属学及工艺—物理冶金]