Vacuum electron beam welding behavior of Al/Cu bimetallic composite plate

被引：0

作者：

Gao H. ^{[1
]}

Chen H. ^{[1
,3
]}

Wang W. ^{[2
,3
]}

Chai F. ^{[3
]}

Wang Z. ^{[3
]}

Liu G. ^{[3
]}

Gong P. ^{[1
]}

机构：

[1] College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan

[2] College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan

[3] Shanxi Key Laboratory of Intelligent Underwater Equipment, Taiyuan

来源：

Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 19期

关键词：

Al/Cu bimetallic composite plate; electron beam welding; mechanism of fracture; microhardness; nanoindentation; phase composition;

D O I：

10.7527/S1000-6893.2023.28288

中图分类号：

学科分类号：

摘要：

Aluminum/copper（Al/Cu）bimetallic composite plate has the advantages of both aluminum alloy and copper alloy，and has a wide application prospect in aerospace and other fields. In this paper，vacuum electron beam welding（EBW）method was used to weld Al/Cu bimetallic composite plate（Al layer on top and Cu layer on bottom），and the influence of different welding parameters on the formability，microstructure and mechanical properties of welded joints was studied. The experimental results show that the weld of Al layer is mainly composed of α-Al and AlCu eutectic structure，the weld center of Cu layer is composed of Al2Cu and AlCu intermetallic compounds，and the edge is composed of Al4Cu9，AlCu，and Al2Cu intermetallic compounds. The microhardness of the base material → heat affected zone → weld at the Al/Cu interface layer increases gradually，and the maximum hardness is 578. 1 HV. The maximum hardness is 590. 4 HV at the vertical interface. The nanoindentation show that the indentation recovery rates in the upper part of the weld，the interface area and the lower part of the weld are 6. 31%，10. 88% and 7. 84%，respectively，and the center of the weld has higher elastic modulus and hardness. The maximum tensile strength of the welded joint is 64. 38 MPa，36% of the strength of the base metal，and the elongation is 1. 44%. The Al layer of the welded joint shows quasi-cleavage fracture，while the Cu layer shows intergranular fracture，which occurs in the region of Al-Cu eutectic structure and Al2Cu intermetallic compound. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.

引用

共 22 条

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