叶杰,林小娉,董允,方杰,王丽

• 1:东北大学材料与冶金学院

摘要(Abstract)：

利用高分辨透射电镜和扫描电镜分析了Mg-4Zn-2Al-0.5Ca合金时效沉淀过程中的相演变。结果表明:试验合金的时效硬化曲线呈现典型的时效硬化特征。试验合金在160℃时效达到峰值硬度时其沉淀相有:平行于(0001)Mg的圆盘状沉淀相、(梳齿状)块状沉淀相以及大量的亚稳过渡相。随时效时间的延长,生成长条状相,但基体中依然存在很多后析出的细小的弥散分布的粒状沉淀相。120℃×230 h时效处理后的微观组织中存在着蜂窝状组织,宽度为3～4 nm的长条状沉淀相,直径为5～7 nm的球状沉淀相;这些沉淀相的存在大大提高了合金的硬度。

关键词(KeyWords)： 时效硬化;沉淀相;峰值硬度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51141007);; 河北省自然科学基金资助项目(E2010001398)

作者(Author): 叶杰,林小娉,董允,方杰,王丽

DOI: 10.13289/j.issn.1009-6264.2012.04.008

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