刘志杰,吴国华,刘文才,丁文江

• 1:上海交通大学轻合金精密成型国家工程研究中心
• 2:上海交通大学金属基复合材料国家重点实验室

摘要(Abstract)：

通过金相观察、X射线衍射、扫描电镜和拉伸性能测试等方法,研究了不同固溶处理工艺对砂型铸造Mg-4Y-2Nd-1Gd-0.4Zr镁合金微观组织和力学性能的影响。结果表明:合金铸态组织主要由α-Mg基体和共晶Mg24 Y5相组成,共晶相区域存在少量的方块相;固溶处理后,合金中方块相明显增多,且主要分布在晶界处;525℃×8 h为合金的最佳固溶工艺;铸态与固溶态合金的室温拉伸断裂方式有所不同,铸态合金总体呈准解理断裂,而525℃×8 h固溶处理后则为典型的穿晶解理断裂方式。

关键词(KeyWords)： Mg-4Y-2Nd-1Gd-0.4Zr;砂型铸造;固溶;显微组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51275295);; 上海航天技术研究院-上海交大航天先进技术联合研究中心资助项目(USCAST2012-15);; 高等学校博士学科点专项科研基金(20120073120011)

作者(Author): 刘志杰,吴国华,刘文才,丁文江

DOI: 10.13289/j.issn.1009-6264.2013.03.013

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