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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φ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%。
The effects of Ca addition on the as-cast microstructure and mechanical properties of ZA104 magnesium alloy were investigated. The results show that the micro-alloying element Ca participates in the formation of strengthening phase of ZA104 alloy. With the increase of Ca content, the microstructure gradually changes into discontinuous or semi-continuous lamellar, Fortified phase from the phase φ and τ gradually transformed into τ1, τ2 two-phase. The Brinell hardness of the alloy increases linearly with the increase of Ca content, but rapidly increases when the content of Ca is less than 0.3% (mass fraction), and increases relatively slowly after> 0.3%. The addition of calcium element through solid solution and the formation of high temperature strengthening Phase form, effectively improve the high-temperature tensile properties of the test alloy, and when adding 0.3% Ca, the tensile strength of the alloy at room temperature and high temperature conditions were the best, respectively, 203 and 190MPa, at this time, the elongation reached The maximum value of 17.3%.