姜锋,陈图,童蒙蒙,蒋靖宇,瞿纪平

• 1:中南大学材料科学与工程学院

摘要(Abstract)：

采用差热分析仪(DSC)、光学显微镜(OM)、扫描电镜(SEM)、透射电镜观察(TEM)、布氏硬度测试等方法研究了一种新型Al-6Zn-2.5Mg-0.6Cu(mass%)合金在单、双级均匀化过程的组织性能演变。结果表明:Al-6Zn-2.5Mg-0.6Cu(mass%)合金铸锭组织中存在着严重的枝晶偏析,由ɑ(Al)和T(Al-Mg-Zn-Cu)四元相组成的非平衡共晶相沿晶界呈连续链状分布;合金经470℃×24 h均匀化处理过后,铸锭晶界得到了明显的净化,晶界上原本大量存在的非平衡共晶相回溶入基体中;铸锭先在250℃×4C h下进行均匀化预处理有利于获得尺寸细小、均匀分布的含Mn、Cr析出相,提高合金的布氏硬度值,确定该新型合金铸锭的最优均匀化工艺为250℃×4 h+470℃×24 h。

关键词(KeyWords)： Al-6Zn-2.5Mg-0.6Cu合金;非平衡共晶相;单级均匀化;双级均匀化

Abstract:

Keywords:

基金项目(Foundation): 中南大学贵重仪器设备开放共享基金(CSUZC201720)

作者(Author): 姜锋,陈图,童蒙蒙,蒋靖宇,瞿纪平

DOI: 10.13289/j.issn.1009-6264.2017-0120

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