邓才智,刘志义,周杰,刘延斌,侯延辉

• 1:中南大学材料科学与工程学院

摘要(Abstract)：

通过力学拉伸、DSC热分析和透射电镜观察,研究了150℃不同时间热暴露对2524合金组织与性能的影响。结果表明:经自然时效(T351)和高温短时人工时效处理(170℃×30min)的合金在热暴露过程中,合金强度随热暴露时间的延长先增加后下降,而伸长率逐渐下降。热暴露500h后,高温短时人工时效处理的试样力学性能退化较快。2524合金高温短时人工时效获得的较大尺寸的原子偏聚(GPB)区比自然时效中的GPB区较难回溶,因此形成的S′相尺寸较大,更易粗化。150℃热暴露合金力学性能衰退的主要原因可归结为合金基体主要强化相S′(Al2CuMg)相粗化以及晶界无析出带(PFZ)的宽化。

关键词(KeyWords)： 2524合金;热暴露;GPB区;力学性能;析出物

Abstract:

Keywords:

基金项目(Foundation): 国家“973”重点基础研究发展项目(2005CB623705-04)

作者(Author): 邓才智,刘志义,周杰,刘延斌,侯延辉

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