陈敬区,刘江文,焦东玲,罗承萍

• 1:华南理工大学材料科学与工程学院

摘要(Abstract)：

对铸造Mg-5Zn-0.6Zr-1RE-2Y镁合金进行450℃固溶+100℃时效处理,时效时间0～5个月,并通过显微硬度测试、XRD、光学金相、SEM、EDS等方法对合金时效过程中的合金相和显微组织的演变进行了研究。结果表明,450℃×12 h固溶和100℃时效后,合金随时效时间延长,晶内时效硬化效应增强,100℃时效3个月时达到硬化峰值87 HV。时效初期时合金晶内析出W相,随着时效时间的延长,合金晶内形成长周期结构χ(Mg12 YZn)相,并析出β′1(MgZn)相,且含量逐渐增多。长周期χ(Mg12YZn)相和细小针(棒)状的β′1(MgZn)相的形成是Mg-5Zn-0.6Zr-1RE-2Y合金低温时效强化的两个主要来源。

关键词(KeyWords)： Mg-Zn-Y系合金;显微组织;时效硬化;Mg12YZn;MgZn

Abstract:

Keywords:

基金项目(Foundation): 广东省自然科学基金资助项目(07006483)

作者(Author): 陈敬区,刘江文,焦东玲,罗承萍

DOI: 10.13289/j.issn.1009-6264.2010.12.019

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