高文静,黄晖,石薇,魏午,文胜平,荣莉,聂祚仁

• 1:北京工业大学新型功能材料教育部重点实验室
• 2:广东腐蚀科学与技术创新研究院

摘要(Abstract)：

采用扫描电镜(SEM)、透射电镜(TEM)和拉伸试验等研究了喷射成形2195铝锂合金经不同工艺热处理后的显微组织和力学性能。结果表明：与未经预拉伸处理的合金相比，合金经4%预拉伸及时效处理后，析出相发生明显变化，时效强化析出相主要为T1(Al_2CuLi)、θ′(Al_2Cu)和δ′(Al_3Li),并呈细小弥散分布，σ(Al_5Cu_6Mg_2)相未析出；合金的力学性能在经4%预拉伸及175℃时效24 h后达到最佳，其抗拉强度为584 MPa,屈服强度为562 MPa,伸长率为8%。这主要是因为在时效前进行预拉伸变形，一方面产生了加工硬化，使后续的沉淀强化得以在较高的强度起点进行；另一方面预拉伸引入了大量位错，为T1相形核提供了优越的位置，促进T1相弥散均匀析出，从而显著提高合金的时效强度。

关键词(KeyWords)： 喷射成形2195铝锂合金;预拉伸;析出相;力学性能

Abstract:

Keywords:

基金项目(Foundation): 北京市教委科研计划科技一般项目(KM202110005010)

作者(Author): 高文静,黄晖,石薇,魏午,文胜平,荣莉,聂祚仁

DOI: 10.13289/j.issn.1009-6264.2021-0521

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