胥福顺,张劲,郭晓斌,邓运来

• 1:中南大学材料科学与工程学院
• 2:云南冶金集团服份有限公司
• 3:中南大学轻合金研究院
• 4:中南大学高性能复杂制造国家重点实验室

摘要(Abstract)：

基于实验室自制的Al-1.2Cu-0.5Mg合金单晶材料,开展了不同应力水平下的应力时效试验和相应的透射电镜组织分析(TEM),并结合3种不同理论模型模拟研究了Al-1.2Cu-0.5Mg单晶经压缩应力时效和人工时效后析出相的分布规律与析出相取向分布作用机制。结果表明:在压应力作用下,Al-1.2Cu-0.5Mg合金单晶的时效析出相出现了显著的取向分布规律,且具有不同晶体取向的单晶在同样的压应力作用下时效后析出相分布取向程度差别明显;3种理论模型中,同时考虑应力与位错耦合作用的模型预测结果与实测结果相符,证明析出相的取向效应既有析出相-应力弹性交互作用促进机制,也有促进析出相均匀形核的位错抑制机制。

关键词(KeyWords)： Al-Cu-Mg合金;单晶;应力时效;取向析出

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51375503);; 中南大学高性能复杂制造重点实验室自主研究项目(ZZYJKT2016-01)

作者(Author): 胥福顺,张劲,郭晓斌,邓运来

DOI: 10.13289/j.issn.1009-6264.2016-x308

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