稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2015年
1期
70-76
,共7页
张庆鑫%佟立波%程丽任%江中浩%孟健%张洪杰
張慶鑫%佟立波%程麗任%江中浩%孟健%張洪傑
장경흠%동립파%정려임%강중호%맹건%장홍걸
Mg-Zn-Ca alloy%Ce/La%solution treatment%MgxZny-Ca-(Ce/La) phase%rare earths
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 CeMg12 and Mg17La2. Furthermore, Ce/La microalloying and solution treatment resulted in an evolu-tion 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 MgxZny-Ca-(Ce/La) phase with higher thermal stability and the amount of Ca2Mg6Zn3/α-Mg eutectic structure was reduced.
