采用X射线衍射和光学显微镜及电子拉伸试验机、维氏硬度计、冲击试验机等分析研究了Mg-3Zn-xY(x=1.5,3,6)合金显微组织对力学性能的影响.结果表明:在基体中和晶界处分布的弥散质点随钇含量的增加而增多;合金中二次相的种类取决于锌、钇质量比,随着钇含量的增加,合金中的二次相依次从I相+W相到W相+H相、H相转变,晶间组织的形态也由细线状向网状转变;合金的抗拉强度、硬度、冲击韧度随着钇含量的增加而提高,塑性则逐渐下降;当钇含量达到6%后合金的综合力学性能下降.
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