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Volume 14
Issue 24
10.3390/ma14247797
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Article

Effects of Different Types of Interlayers on the Interfacial Reaction Mechanism at the Cu Side of Al/Cu Lap Joints Obtained by Laser Welding/Brazing

by
Ruican Zhu
1,2,
Shixiong Guo
1,
Chao Huang
1,
Zhenglong Lei
3,*,
Xinrui Zhang
3 and
Jinge Liu
3
1
Capital Aerospace Machinery Corporation Limited, Beijing 100076, China
2
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
3
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Materials 2021, 14(24), 7797; https://doi.org/10.3390/ma14247797
Submission received: 16 September 2021 / Revised: 6 December 2021 / Accepted: 11 December 2021 / Published: 16 December 2021
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Abstract

The influence of tin foil and Ni coatings on microstructures, mechanical properties, and the interfacial reaction mechanism was investigated during laser welding/brazing of Al/Cu lap joints. In the presence of a Zn-based filler, tin foil as well as Ni coating strengthened the Al/Cu joints. The tin foil only slightly influenced the joint strength. It considerably improved the spreading/wetting ability of the weld filler; however, it weakened the bonding between the seam and the Al base metal. The Ni coating considerably strengthened the Al/Cu lap joints; the highest tensile strength was 171 MPa, which was higher by 15.5% than that of a joint without any interlayer. Microstructure analysis revealed that composite layers of Ni3Zn14–(τ2 Zn–Ni–Al ternary phase)–(α-Zn solid solution)–Al3Ni formed at the fusion zone (FZ)/Cu interface. Based on the inferences about the microstructures at the interfaces, thermodynamic results were calculated to analyze the interfacial reaction mechanism. The diffusion of Cu was limited by the Ni coating and the mutual attraction between the Al and Ni atoms. The microstructure comprised Zn, Ni, and Al, and they replaced the brittle Cu–Zn intermetallic compounds, successfully strengthening the bonding of the FZ/Cu interface.
Keywords: Al/Cu lap joint; laser welding/brazing; tin foil; Ni coating; interfacial microstructure; interfacial bonding mechanism Al/Cu lap joint; laser welding/brazing; tin foil; Ni coating; interfacial microstructure; interfacial bonding mechanism

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MDPI and ACS Style

Zhu, R.; Guo, S.; Huang, C.; Lei, Z.; Zhang, X.; Liu, J. Effects of Different Types of Interlayers on the Interfacial Reaction Mechanism at the Cu Side of Al/Cu Lap Joints Obtained by Laser Welding/Brazing. Materials 2021, 14, 7797. https://doi.org/10.3390/ma14247797

AMA Style

Zhu R, Guo S, Huang C, Lei Z, Zhang X, Liu J. Effects of Different Types of Interlayers on the Interfacial Reaction Mechanism at the Cu Side of Al/Cu Lap Joints Obtained by Laser Welding/Brazing. Materials. 2021; 14(24):7797. https://doi.org/10.3390/ma14247797

Chicago/Turabian Style

Zhu, Ruican, Shixiong Guo, Chao Huang, Zhenglong Lei, Xinrui Zhang, and Jinge Liu. 2021. "Effects of Different Types of Interlayers on the Interfacial Reaction Mechanism at the Cu Side of Al/Cu Lap Joints Obtained by Laser Welding/Brazing" Materials 14, no. 24: 7797. https://doi.org/10.3390/ma14247797

APA Style

Zhu, R., Guo, S., Huang, C., Lei, Z., Zhang, X., & Liu, J. (2021). Effects of Different Types of Interlayers on the Interfacial Reaction Mechanism at the Cu Side of Al/Cu Lap Joints Obtained by Laser Welding/Brazing. Materials, 14(24), 7797. https://doi.org/10.3390/ma14247797

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