期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 9, 期 6, 页码 13239-13249出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2020.09.042
关键词
Modified friction stir; clinching-brazing; Friction stir spot welding-brazing; Aluminum alloy; Cu alloy; Microstructure; Mechanical properties
资金
- Hunan Provincial Natural Science Foundation of China
- National Science Foundation of China [71501031]
- Liaoning Province Education Administration [LN2017QN036]
This paper focuses on the improvement of hybrid Cu/Al weld performance via a combination of self-reacting brazing mechanism (for stable metallurgical transformation) and process modification approach (for the elimination of tool profile-induced stress-raiser). The modified friction stir clinching-brazing (MFSC-B) and friction stir spot welding-brazing (FSSW-B) of dissimilar AA5083-H321 aluminum and commercially pure Cu alloys are investigated with the use of a thin Zn intermediate layer. The load-bearing capacity, fracture behavior, and microstructure of the respective joints are investigated and compared. The results show that plausible intermetallic phases of Al-Cu (Al2Cu and Al4Cu9) and Cu-Zn are present at the stir zones of all the joints while the brazed zone of the MFSC-B joint is predominated by uniform lamellar eutectic structure due to higher heat input, localized two-fold Zn melting, and frictional-stirring activated eutectic transformation. The increase in the load-bearing area (brazed + stir zones) of the MFSC-B joint improved the fracture resistance of the joint by 59% as the average tensile-shear loads of about 7.0 and 4.4 kN were obtained in the MFSC-B and FSSW-B joints respectively. The use of MFSC-B is thus recommended as a reasonable alternative for improving the weld performance of dissimilar reactive metals. (C) 2020 The Authors. Published by Elsevier B.V.
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