刘鹏,江海涛,康强

• 1:北京科技大学冶金工程研究院

摘要(Abstract)：

研究了Ca元素对450℃热轧350℃退火1 h的Mg-2Al-x Ca(x=0,0.2,0.5,1.0,2.0;mass%)显微组织、力学性能、腐蚀性能的影响。用光学显微镜、扫描电镜、能谱仪和极化曲线等综合分析了钙元素的微观作用机制。结果表明,少量钙元素主要以固溶形式存在,随着钙元素增多,形成了Mg17(Al,Ca)_(12)、Al_2Ca等含钙相粒子,使得晶粒不断细化、强度不断增加、耐蚀性能不断下降。其中,Mg-2Al-0.5Ca合金的综合性能最优,抗拉强度为232 MPa,伸长率为20%,极化曲线自腐蚀电位-1.49 V,自腐蚀电流密度208.92μA·cm~(-2)。

关键词(KeyWords)： 镁合金;钙元素;显微组织;力学性能;极化曲线

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本业务费(FRF-IC-15-002)

作者(Author): 刘鹏,江海涛,康强

DOI: 10.13289/j.issn.1009-6264.2015.s2.006

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