以ZK60为母合金,通过添加不同量的稀土元素Y,制备了2种Mg-Zn-Y-Zr合金.用扫描电镜和X射线衍射对合金铸态组织进行观测和分析发现,在ZK60合金中添加质量分数为1.04%的Y后,组织中析出I相(Mg3Zn6Y).当Y的加入量增至2.10%,合金组织中主要析出W相(Mg3Zn3Y2)伴有微量的I相.I相和W相呈层片状分布在晶界处,有少量呈棒状,分布在晶内.这些细小、弥散分布的第二相对合金产生显著的强化作用,改善了合金的热加工性能,使得ZK60合金易热裂的缺点得到明显改善,在340～380℃温度范围内挤压没有发生热裂.实验表明,添加Y的挤压棒材的拉伸强度有较大幅度提高,延伸率略有增加.
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