采用常规铸造和热形变相结合的工艺制备Mg-6Gd-6Y-1Zn四元镁合金,并对其显微组织和力学性能进行较系统的研究.结果表明:合金的铸态组织主要由α-Mg,Mg24(GdYZn)5和具有18R-LPSO结构的Mg12Y1Zn1相组成.合金热挤压过程中Mg12Y1Zn1相被拉长,呈长条状沿挤压方向排列,而14H-LPSO相则分布于Mg12Y1Zn1相之间.挤压态合金在高温固溶处理后,Mg12Y1Zn1相溶入基体,而基体中的14H-LPSO相增加.挤压态合金经固溶和时效(T6)处理后,显微组织中呈现18R-LPSO,14 H-LPSO结构和β'沉淀颗粒共存.对挤压后的合金直接进行时效(T5)处理过程中也发生了β'沉淀,但14H-LPSO相体积分数没有T6态多.合金在T6态的性能最好,强度和塑性达到了良好的匹配.
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