采用Ar气保护制备了Mg-5Sn-1Si(质量分数,％)合金,并研究了合金的铸态组织和在480 ℃固溶处理及180 ℃和280℃不同时效热处理对合金组织中析出相演变的影响及组织与硬度的关系.结果表明,合金铸态组织由α-Mg、共晶Mg2Si、共晶Mg2Sn三相组成;经480℃固溶处理后Mg2Sn相完全固溶,粗大的Mg2Si相得到少量球化;时效处理过程中Mg2Si相得到球化.在180℃时效时,Mg2Sn无沉淀析出,硬度较低,时效保温24 h仅为24.1 HV.在280℃时效时,细小的Mg2Sn相弥散析出并使合金的硬度明显升高,时效保温18 h达到峰值硬度47.6 HV,并随时间的延长出现过时效现象.280℃时效初期,组织中形成较宽的无析出带(PFZ),随着时效时间的延长无析出带PFZ消失.
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