Effects of minor Ca addition on as-cast microstructure and mechanical properties of Mg–4Y–1.2Mn–1Zn (wt.%) magnesium alloy
Effects of minor Ca addition on as-cast microstructure and mechanical properties of Mg–4Y–1.2Mn–1Zn (wt.%) magnesium alloy
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DOI：
10.1016/j.jallcom.2013.04.069
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发表时间：
2013-10
影响因子：
6.2
通讯作者：
Ming-bo Yang;Chengyu Duan;Hongliang Li;Tingzhang Guo;Jia Zhang
中科院分区：
文献类型：
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作者：
Ming-bo Yang;Chengyu Duan;Hongliang Li;Tingzhang Guo;Jia Zhang
采用金相、电镜、差示扫描量热分析（DSC）、拉伸和蠕变试验等研究了微量Ca对Mg-4Y-1.2Mn-1Zn （wt.%）合金铸态组织和力学性能的影响。结果表明，在Mg-4Y-1.2Mn-1Zn合金中添加0.3 ~ 0.9 wt.%Ca对Mg12YZn相的形貌和分布没有明显影响。当Ca含量从0.3 wt.%增加到0.9 wt.%时，晶粒尺寸逐渐减小。此外，在Mg-4Y-1.2Mn-1Zn合金中添加0.3 ~ 0.9 wt.%的Ca可以有效改善合金的拉伸性能和蠕变性能。在含Ca合金中，Ca添加量为0.6和0.9 wt.%的合金表现出相对最佳的拉伸和蠕变性能。含ca合金的拉伸性能和蠕变性能的改善可能与合金中含ca Mg12YZn相的晶粒细化和更高的热稳定性有关。
The effects of minor Ca addition on the as-cast microstructure and mechanical properties of the Mg–4Y–1.2Mn–1Zn (wt.%) alloy were investigated by using optical and electron microscopies, differential scanning calorimetry (DSC) analysis, and tensile and creep tests. The results indicate that adding 0.3–0.9 wt.%Ca to the Mg–4Y–1.2Mn–1Zn alloy does not cause an obvious change in the morphology and distribution for the Mg12YZn phase in the alloy. However, the grains of the Ca-containing alloys are effectively refined, and an increase in Ca amount from 0.3 wt.% to 0.9 wt.% causes the grain size to gradually decrease. In addition, adding 0.3–0.9 wt.%Ca to the Mg–4Y–1.2Mn–1Zn alloy can effectively improve the tensile and creep properties. Among the Ca-containing alloys, the alloys with the additions of 0.6 and 0.9 wt.%Ca exhibit the relatively optimum tensile and creep properties. The improvement in the tensile and creep properties for the Ca-containing alloys is possibly related to the grain refinement and higher thermal stability of the Ca-containing Mg12YZn phases in the alloys, respectively.