摘要
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。
Abstraet：Mg-Ca alloys with different content of Calcium （Ca） were prepared by steel mould casting method. The effect of Ca content on the microstructure and mechanical properties of the alloy were investigated by optical microscope, X-ray diffraction, scanning electron microscope and universal materials testing machine. The results show that the microstructure of Mg-Ca alloys with different Ca content is composed of ct-Mg matrix and divorced eutecfic （et-Mg＋Mg2Ca） forming along the grain boundaries. The volume fraction of Mg2Ca phase increases and the microstructure of Mg-Ca alloy is refined with the increase of Ca content. The compressive strength and yield strength are improved with increasing Ca content. Mg-12.17wt% Ca alloy exhibits the highest compressive strength and yield strength, which is 308.21 MPa and 303.49 MPa, respectively. However, the elongation of Mg-Ca alloys decreases with Ca content increasing. Key words：Mg-Ca alloy; microstructure; mechanical properties
出处
《热加工工艺》
CSCD
北大核心
2014年第6期4-8,共5页
Hot Working Technology
基金
国家自然基金(51201120)
西安工业大学校长科研基金(XAGDXJJ1008)
西安工业大学大学生创新创业训练计划项目(201210702016)
关键词
镁钙合金
微观组织
力学性能
Mg-Ca alloy
microstructure
mechanical properties
