刘海全,许晓嫦,吴峰

• 1:中南大学材料科学与工程学院
• 2:中南大学有色金属材料科学与工程教育部重点实验室

摘要(Abstract)：

通过扫描电镜(SEM)、差热分析(DSC)、电子探针(EPMA)、波谱分析(WDX)和X射线衍射等方法,研究了2524铝合金铸锭均匀化过程中的组织演变。结果表明:合金铸锭由枝晶和非平衡相组成;300℃以上均匀化时,晶粒内析出大量的弥散相,延长保温时间,弥散相尺寸变大,分布逐渐变均匀;随着均匀化温度升高,非平衡相逐渐溶解、球化,残余相为Al12Cu Mn2,残余相周围存在PFZ,其形成机制为贫溶质机制;不同冷却方式影响合金的最终组织,冷却速度较快时析出相细小弥散,冷却速度较慢时晶界和晶内有粗大S相形成。

关键词(KeyWords)： 均匀化;弥散相;残余相;PFZ;冷却方式

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划资助项目(2012CB619506)

作者(Author): 刘海全,许晓嫦,吴峰

DOI: 10.13289/j.issn.1009-6264.2015.11.009

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