袁家伟,李婷,李兴刚,李永军,张奎,郝永辉,罗广求,罗萍

• 1:北京有色金属研究总院国家重点实验室
• 2:中国电子科技集团公司第十八研究所

摘要(Abstract)：

采用光学显微镜、X射线衍射、布氏硬度测试、扫描电镜、能谱分析等方法,研究新型Mg-4Zn-1Mn(ZM41)镁合金在铸态和不同热处理状态下的显微组织、成分、硬度变化规律。用激光闪射法测定其不同状态的热扩散系数,计算得到导热率值。以空位扩散机制为基础,研究均匀化扩散动力学过程,建立此合金的均匀化扩散方程。结果表明:铸态组织枝晶偏析严重,晶界上有许多粗大的Mg7Zn3非平衡结晶相,Mn以单质形式存在于合金中。经370℃×12 h均匀化热处理后,大部分的Mg7Zn3相已溶入基体。根据实验结果和均匀化动力学计算,确定最佳均匀化处理工艺为370℃×12 h。该合金室温导热率值为125.5 W/(m.K),比常见的镁合金如AZ系、AM系、AS系等的导热性能高出1倍左右。

关键词(KeyWords)： Mg-4Zn-1Mn镁合金;导热率;均匀化热处理;扩散动力学

Abstract:

Keywords:

基金项目(Foundation): 国家“十二五”支撑计划课题(2011DAE22B01)

作者(Author): 袁家伟,李婷,李兴刚,李永军,张奎,郝永辉,罗广求,罗萍

DOI: 10.13289/j.issn.1009-6264.2012.04.009

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