Effect of Ce/La microalloying on microstructural evolution of Mg-Zn-Ca alloy during solution treatment

作     者：张庆鑫 佟立波 程丽任 江中浩 孟健 张洪杰 ZHANG Qingxin;TONG Libo;CHENG Liren;JIANG Zhonghao;MENG Jian;ZHANG Hongjie

作者机构：State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Key Lab of Automobile Materials College of Materials Science and Engineering Jilin University 

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

年 卷 期：2015年第33卷第1期

页      面：70-76页

核心收录：

学科分类：080503[工学-材料加工工程] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0708[理学-地球物理学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the National Natural Science Foundation of China(51401200) Natural Science Foundation of Jilin Province(20140520099JH) National Science & Technology Pillar Program(2012BAE01B04) Chinese Academy of Sciences of Western Action Plan Project(KZCX2-XB3-06) the National Natural Science Foundation of China Major Project(91122030) National High Technology Research and Development Program of China(2011AA03A407) National Natural Science Foundation for Creative Research Group(20921002) 

主　　题：Mg-Zn-Ca alloy Ce/La solution treatment MgxZny-Ca-(Ce/La) phase rare earths 

摘      要：The effect of Ce/La misch metal addition on the microstructural evolution of as-cast and as-soluted Mg-5.3Zn-0.5Ca（wt.%） alloys was systematically investigated. It was found that Ce/La could effectively refine the as-cast alloy and restrain grain growth during solution treatment, which was derived from the constitutional supercooling during solidification process and the formation of stable intermetallic compounds Ce Mg12 and Mg17La2. Furthermore, Ce/La microalloying and solution treatment resulted in an evolution from the original lamellar Ca2Mg6Zn3/α-Mg to the divorced eutectic structure. The thermal stability of Mg-Zn-Ca alloy could be effectively improved by Ce/La addition, because the low-melting-point binary Mg-Zn phase was transformed to Mg x Zn y-Ca-（Ce/La） phase with higher thermal stability and the amount of Ca2Mg6Zn3/α-Mg eutectic structure was reduced.