通过位错和合金化调节析出行为,实现铝-铜-锂合金的优异强度-电导率平衡

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-10-30 DOI:10.1016/j.jallcom.2024.177334
Yuankang Xie, Shengdan Liu, Xiaobin Guo, Xiyu He, Chaojie Liang, Yunlai Deng
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引用次数: 0

摘要

传统的 T8 热处理难以实现铝-铜-锂合金的强度和延展性之间的权衡,而在这项工作中,有一种可行的策略可以克服这一挑战。对不同时效处理的微观结构和性能进行分析后发现,随着 T1 相尺寸的增大,滑动位错从剪切析出到难剪切析出的转变是降低延展性的主要因素。通过利用高位错密度辅助异质成核和同步辅助扩散手段,结合 S'相和 T1 相之间的析出竞争,实现了对 T1 相尺寸的有效控制。通过位错和合金化严格控制时效后的析出,屈服强度(650 兆帕)明显高于 T6 和 T85 热处理合金(150 兆帕和 30 兆帕),最显著的是伸长率达到 13%。因此,这项研究对开发用于航空航天的高性能铝-铜-锂合金具有重要意义。
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Modulation of precipitation behavior by dislocations and alloying for superior strength-ductility balance in Al-Cu-Li alloys
Conventional T8 heat treatment makes it difficult to achieve the strength and ductility trade-off of Al-Cu-Li alloys, and a feasible strategy to overcome this challenge in this work. Analyzing the microstructures and properties of different aging treatments shows that the transition of sliding dislocation from shear to difficult shear precipitates with increasing T1 phase size is a major factor in reducing ductility. Effective control of the size of the T1 phase was achieved by utilizing high dislocation density-assisted heterogeneous nucleation and simultaneous assisted diffusion means combined with precipitation competition between the S' and T1 phases. Dislocation and alloying to tightly control precipitation after aging, the yield strength (650 MPa) is significantly higher than that of T6 and T85 heat-treated alloys (150 MPa and 30 MPa), and most notably, the elongation reaches 13%. As a consequence, this study is of great significance for the development of high-performance Al-Cu-Li alloys for aerospace applications.
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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