江茫,肖锎,刘伟,唐启东,徐进军

• 1:空军航空维修技术学院航空机电设备维修学院
• 2:中机国际工程设计研究院有限责任公司
• 3:江西省检验检测认证总院特种设备检验检测研究院

摘要(Abstract)：

采用扫描电镜、透射电镜、显微硬度仪和拉伸试验等研究了预拉伸以及蠕变时效处理对Al-Cu-Li-Sc合金的微观组织演变以及力学性能的影响。结果表明:时效前进行预拉伸处理能够促进合金中的T_1相和θ′相的析出,抑制δ′和σ(Al_5Cu_6Mg_2)相的析出,并能够减少晶界析出相数量和抑制无沉淀析出带(PFZ)的形成,从而提高合金强度。预拉伸处理后再进行蠕变时效处理能够进一步调控合金的时效析出行为,提升合金力学性能;合金的屈服强度、抗拉强度以及伸长率分别可达550 MPa、583 MPa以及14.1%。

关键词(KeyWords)： Al-Cu-Li-Sc合金;预拉伸;蠕变时效;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 湖南省自然科学基金科教联合项目(2019JJ70032,2020JJ7077)

作者(Author): 江茫,肖锎,刘伟,唐启东,徐进军

DOI: 10.13289/j.issn.1009-6264.2021-0306

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