研究发现,Mg-5Zn-3Al-0.2Mn合金的砂型铸造组织相组成为δ-Mg基体和τ(Mg32(Al,Zn)49)化合物.在343℃固溶17 h后淬火,合金组织完全转变为固溶体,力学性能最佳,σb=245 MPa,δ=12%.合金中加入xCa后,组织发生变化.当x=0.43%(质量分数)时,相组成为δ-Mg+Mg-Zn-Al-Ca复杂化合物相.当x=0.95%和1.80%时,相组成为Mg-Zn-Al-Ca相+δ-Mg+A12Ca.随着x增加,铸态合金室温力学性能呈下降趋势.加Ca合金在350℃固溶17 h后淬火,室温力学性能有所提高,而σb250°和σ250°则随x增加而稳步提高.
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