Underlying reasons of poor mechanical performance of thick plate aluminum-copper alloy vacuum electron beam welded joints

被引：1

作者：

Chen G. ^{[1
]}

Liu J. ^{[1
]}

Dong Z. ^{[1
]}

Shu X. ^{[1
]}

Zhang B. ^{[1
]}

机构：

[1] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin

来源：

Vacuum | 2020年 / 182卷

基金：

中国国家自然科学基金;

关键词：

Electron beam welding; Eutectic structure; Joint softening; Microstructure; Strengthening phase;

D O I：

10.1016/j.vacuum.2020.109667

中图分类号：

学科分类号：

摘要：

As a light-weight and high-strength structural material, aluminum alloy has become an irreplaceable metal material in the aerospace field. In this paper, 25 mm thick Al-Cu alloy (2A12) was welded by electron beam. The welded joints softened leading to the hardness and tensile strength of the joint decreased. In view of the decrease of mechanical properties, the microstructure in different areas of the welded joint was analyzed. At the same time, the formation mechanism of rosaceous microstructures and eutectic structures was revealed. The influence of impurity elements on the joint was analyzed. In addition, the reason of joint strengthening effect weakening was explained combining with welding temperature field and the precipitation model of competition. © 2020 Elsevier Ltd

引用

共 24 条

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