研究了Mg-3.8Zn-2.2Ca-xSn (x=0,0.5,1,2,质量分数％)镁合金的铸态组织、抗拉性能和蠕变性能.结果发现:在含Sn合金中会形成CaMgSn相,并且随着Sn含量从0.46％增加到1.88％(质量分数),合金中CaMgSn相的数量增加.同时,合金中Ca2Mg6Zn3相的形貌从最初的连续和/或半连续网状转变为半连续和/或断续状.此外,含Sn合金的晶粒被明显细化,其中含0.90％Sn合金的晶粒最细.与三元合金相比,含0.46％和0.90％Sn合金的抗拉性能和蠕变性能改善明显,而含1.88％Sn合金的屈服强度和蠕变性能虽然得到改善,但其抗拉强度和延伸率减小.在含0.46％、0.90％和1.88％Sn的3个合金中,含0.90％Sn的合金显示了优化的抗拉性能和蠕变性能.
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