夏卿坤,刘志义,李云涛,刘延斌,余日成

• 1:中南大学材料科学与工程学院
• 2:中南大学材料科学与工程学院
• 3:中南大学材料科学与工程学院
• 4:中南大学材料科学与工程学院

摘要(Abstract)：

研究了Al-Cu-Mg-Ag-Zr合金高温短时拉伸和热暴露行为及其微观组织。高温拉伸试验结果表明,在150~250℃范围内,高温强度下降比较平缓,且250℃下的拉伸强度达到270MPa;在250~300℃范围内,高温强度迅速下降。热暴露试验结果表明,在相同时间的条件下,暴露温度从室温至150℃合金的强度和伸长率几乎没有变化,从200~300℃合金强度下降,但在200℃热暴露后的拉伸强度仍保持386MPa。透射电镜分析表明,合金欠时效状态由大量细小分布的Ω相及极少量的θ′相组成,随着暴露温度的提高,Ω相长大并粗化,至250℃热暴露后Ω相大幅度减少,无析出带(PFZ)宽化。研究表明,短时高温拉伸条件下,Ω相在250℃下仍能保持稳定,而长时间(100h)热暴露时,Ω相只能在200℃下维持稳定。

关键词(KeyWords)： Al-Cu-Mg-Ag-Zr合金;时效;热暴露;显微组织;力学性能

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): 夏卿坤,刘志义,李云涛,刘延斌,余日成

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