Phase Equilibrium of Mg-Zn-La System in Mg-Rich Corner from 200 to 350 ℃  

作　　者：黄明丽 李洪晓 丁桦 任玉平 郝士明 

机构地区：[1]School of Materials and Metallurgy, Northeastern University

出　　处：《Journal of Rare Earths》2007年第S1期519-522,共4页稀土学报（英文版）

基　　金：the National Natural Science Foundation of China (50471025);Natural Science Foundation of Lia-oning Province (20052028);National Key Technology R &D Program(2006BAE04B09-7)

摘　　要：Alloys of Mg-Zn-La system in Mg rich corner were prepared, and the phase relationship was investigated at different temperatures such as 200, 300 and 350 ℃ by scanning electron microscopy(SEM), X-ray diffraction(XRD) and electron probe microanalysis with energy dispersive X-ray spectroscopy (EPMA). Two types of phase equilibrium were identified at the different temperatures. One is two-phase equilibrium contained the Mg solid solution and T-phase. The other is three-phase equilibrium which contained the Mg solid solution, MgZn phase and T-phase. T-phase was stable as the temperature changed. The La content in T-phase is constant which is about 8±0.3% (atom fraction); but the Mg content and Zn content of that is changed, and the Zn content in T-phase was from 16.1% to 44%. The solubility of La in MgZn phase was increased from 1.2% to 1.6% as the temperature increasing from 200 to 350 ℃.Alloys of Mg-Zn-La system in Mg rich corner were prepared, and the phase relationship was investigated at different temperatures such as 200, 300 and 350 ℃ by scanning electron microscopy(SEM), X-ray diffraction(XRD) and electron probe microanalysis with energy dispersive X-ray spectroscopy (EPMA). Two types of phase equilibrium were identified at the different temperatures. One is two-phase equilibrium contained the Mg solid solution and T-phase. The other is three-phase equilibrium which contained the Mg solid solution, MgZn phase and T-phase. T-phase was stable as the temperature changed. The La content in T-phase is constant which is about 8±0.3% (atom fraction); but the Mg content and Zn content of that is changed, and the Zn content in T-phase was from 16.1% to 44%. The solubility of La in MgZn phase was increased from 1.2% to 1.6% as the temperature increasing from 200 to 350 ℃.

关 键 词：Mg-Zn-La system phase equilibrium T-phase phase diagram rare earths 

分 类 号：TG146.22[一般工业技术—材料科学与工程]