针对CaMgSn形貌对Mg-Sn-Ca系合金的力学性能具有重要的影响,研究了慢冷、快冷及时效处理对CaMgSn组织形貌的影响规律.分别采用光学显微镜、扫描电镜、X射线衍射仪和维氏硬度计对比分析了不同处理条件对Mg-3Sn-2Ca-3Cu(质量分数/%)合金微观组织、相结构和硬度的影响.Mg-3Sn-2Ca-3Cu合金慢冷组织主要由α-Mg、CaMgSn、Mg2Ca、CuMg2和Mg2Sn构成,其中CaMgSn为粗大的棒状相;快冷及时效处理后,CaMgSn的形态发生了明显的改变,在时效48 h时,转变为近球状形貌.时效处理后,合金的维氏硬度得到了明显的提高,在时效48 h时达到最高值77.随时效时间延长,表现为硬度的降低和第二相与基体的脱离.
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