喷射沉积Mg-9Al-4.5Ca合金的显微组织和力学性能研究Microstructure and mechanical properties of spray deposited Mg-9Al-4.5Ca alloy
王震东;陈伟;王有祁;马力;
摘要(Abstract):
通过金相显微镜、X射线衍射仪、扫描电镜、拉伸试验机对喷射沉积工艺制备的Mg-9Al-4.5Ca锭坯沉积态和挤压态的显微组织、相组成与力学性能进行研究。结果表明:喷射沉积Mg-9Al-4.5Ca合金的组织较常规铸态细小,经热挤压加工后组织进一步细化,沉积态合金的组织为等轴晶,晶粒度为3~5μm;沉积坯的相组成为α-Mg、Al2Ca、Mg2Ca、Ca2Mg6Zn3和MgZn2,经热挤压后相组成转变为α-Mg、Al2Ca、Mg2Ca、Mg17Al12和MgZn2;合金挤压态的力学性能较常规变形镁合金MB7有显著提高,抗拉强度、屈服强度、延伸率分别为470MPa、390MPa、8%。合金的强化机制主要为细晶强化,固溶强化和弥散强化。
关键词(KeyWords): 镁合金;Mg-Al-Ca;喷射沉积;快速凝固;显微组织;力学性能
基金项目(Foundation):
作者(Author): 王震东;陈伟;王有祁;马力;
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参考文献(References):
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