Microstructure and mechanical properties of Cu/Al joints brazed using (Cu, Ni, Zr, Er)-modified Al-Si filler alloys

Hua-xinLI,Ying-dianFENG,Wei-jianSHEN,Chuan-yangLü,Wen-jianZHENG,Ying-heMA,GangMA,Zhong-pingJIN,Yan-mingHE,Jian-guoYANG,

doi:10.1016/S1003-6326(22)66044-8

Transactions of Nonferrous Metals Society of China >

2022 , Vol. 32 >Issue 11: 3623 - 3634

DOI: https://doi.org/10.1016/S1003-6326(22)66044-8

Materials Science and Engineering

Microstructure and mechanical properties of Cu/Al joints brazed using (Cu, Ni, Zr, Er)-modified Al-Si filler alloys

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Hua-xin LI^1,2,3,4, Ying-dian FENG^1,3,5, Wei-jian SHEN^1,3, Chuan-yang Lü^1,2,3, Wen-jian ZHENG^1,2,3, Ying-he MA^1,2,3, Gang MA⁵, Zhong-ping JIN⁵, Yan-ming HE^1,2,3, Jian-guo YANG^1,2,3

1. Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310023, China;
2. Engineering Research Center of Process Equipment and Remanufacturing, Ministry of Education, Zhejiang University of Technology, Hangzhou 310023, China;
3. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China;
4. Innovation Research Institute of Zhejiang University of Technology (Shengzhou), Shengzhou 312400, China;
5. Taizhou Special Equipment Inspection and Testing Research Institute, Taizhou 318000, China

Online published: 2022-11-25

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Abstract

To design a promising Al-Si filler alloy with a relatively low melting-point, good strength and plasticity for the Cu/Al joint, the Cu, Ni, Zr and Er elements were innovatively added to modify the traditional Al-Si eutectic filler. The microstructure and mechanical properties of filler alloys and Cu/Al joints were investigated. The result indicated that the Al-Si-Ni-Cu filler alloys mainly consisted of Al(s,s), Al₂(Cu,Ni) and Si(s,s). The Al-10Si-2Ni-6Cu filler alloy exhibited relatively low solidus (521 °C) and liquidus (577 °C) temperature, good tensile strength (305.8 MPa) and fracture elongation (8.5%). The corresponding Cu/Al joint brazed using Al-10Si-2Ni-6Cu filler was mainly composed of Al₈(Mn,Fe)₂Si, Al₂(Cu,Ni)₃, Al(Cu,Ni), Al₂(Cu,Ni) and Al(s,s), yielding a shear strength of (90.3±10.7) MPa. The joint strength was further improved to (94.6±2.5) MPa when the joint was brazed using the Al-10Si-2Ni-6Cu-0.2Er-0.2Zr filler alloy. Consequently, the (Cu, Ni, Zr, Er)-modified Al-Si filler alloy was suitable for obtaining high-quality Cu/Al brazed joints.

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Hua-xinLI,Ying-dianFENG,Wei-jianSHEN,Chuan-yangLü,Wen-jianZHENG,Ying-heMA,GangMA,Zhong-pingJIN,Yan-mingHE,Jian-guoYANG, . Microstructure and mechanical properties of Cu/Al joints brazed using (Cu, Ni, Zr, Er)-modified Al-Si filler alloys[J]. Transactions of Nonferrous Metals Society of China, 2022 , 32(11) : 3623 -3634 . DOI: 10.1016/S1003-6326(22)66044-8

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