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利用铁模铸造法制备了不同钙含量的镁钙合金,采用光学显微镜、X-射线衍射仪、扫面电镜和万能材料试验机研究了Ca含量对Mg-Ca合金微观组织和力学性能的影响。结果表明,不同Ca含量的Mg-Ca合金微观组织主要是由α-Mg基体和晶界离异共晶体(α-Mg+Mg2Ca)组成,且随钙含量增加,Mg2Ca含量不断增加。Mg-Ca合金的显微组织随Ca含量的增加得到细化。合金的抗压强度和屈服强度随Ca含量的增加而增大,Mg-12.17wt%Ca合金的压缩强度和屈服强度最高,分别为308.21、303.49MPa。但该合金的伸长率随Ca含量的增加而减小。
Magnesium-calcium alloy with different calcium content was prepared by iron casting method. The effects of Ca content on the microstructure and mechanical properties of Mg-Ca alloy were investigated by optical microscope, X-ray diffraction, scanning electron microscopy and universal material testing machine. The results show that the microstructure of Mg-Ca alloy with different Ca content is mainly composed of α-Mg matrix and grain boundary dissociation eutectic (α-Mg + Mg2Ca). With the increase of calcium content, the content of Mg2Ca increases continuously. The microstructure of Mg-Ca alloy is refined with the increase of Ca content. The compressive strength and yield strength of the alloy increase with the increase of Ca content. The compressive strength and yield strength of Mg-12.17wt% Ca alloy are the highest, which are respectively 308.21 and 303.49MPa. However, the elongation of the alloy decreases with the increase of Ca content.