设计了成分为Mg-1.5Zn-xY和Mg-1.5Zn-xCe(x=0,0.2,0.5,1.0)两组试样.通过光学显微镜、扫描电镜、X衍射等研究稀土Y和Ce对热轧态Mg-1.5Zn合金组织和室温成形性能的影响.结果表明:Y和Ce元素可以有效地弱化合金的(0002)基面织构,而且基面织构均沿着TD方向发生一定程度的分裂.Y和Ce元素的加入,使合金中分别形成了Mg2Y5,Mg3Zn3Y和MgZnCe弥散的第二相粒子,起到了细晶强化作用.此外,还有利于合金再结晶行为的发生,使得合金塑性(伸长率最高达27％)、强度(抗拉强度最高达252MPa)和室温成形性能(杯突值最高可达5.46)都得到很大提高.但是,过多Y和Ce的加入将不利于合金性能的进一步提高.
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