研究了Ca的加入对金属型铸造ZA104镁合金铸态组织和力学性能的影响.结果表明:微合金化元素Ca参与了ZA104试验合金强化相的形成,随Ca含量的增加,组织由不连续、或半连续层片状、细小网格状逐渐演变成连续粗大的肋骨网状,强化相则由ψ相和τ相逐渐转变为τ1、τ2两相.合金的布氏硬度值随Ca含量增加呈线性上升,但Ca含量≤0.3%(质量分数)时上升急速,而＞0.3%以后上升趋势相对缓慢:钙元素的加入,通过固溶以及形成高温强化相的形式,有效提高了试验合金的高温拉伸性能,且当添加0.3%Ca时,合金的抗拉强度在室温与高温状态下最佳,分别为203和190MPa,此时,延伸率也达最大值17.3%.
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