INFLUENCE OF THE COMPOSITION OF Zn-Al FILLER METAL ON THE INTERFACIAL STRUCTURE AND PROPERTY OF Cu/Zn-Al/Al BRAZED JOINT

doi:10.11900/0412.1961.2014.00522

Acta Metall Sin

2015, Vol. 51

Issue (3): 364-370 DOI: 10.11900/0412.1961.2014.00522

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INFLUENCE OF THE COMPOSITION OF Zn-Al FILLER METAL ON THE INTERFACIAL STRUCTURE AND PROPERTY OF Cu/Zn-Al/Al BRAZED JOINT

YANG Hao¹, HUANG Jihua¹(

), CHEN Shuhai¹, ZHAO Xingke¹, WANG Qi², LI Dehua²

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2 Gree Electric Appliances, Inc. of Zhuhai, Zhuhai 519070

Cite this article:

YANG Hao, HUANG Jihua, CHEN Shuhai, ZHAO Xingke, WANG Qi, LI Dehua. INFLUENCE OF THE COMPOSITION OF Zn-Al FILLER METAL ON THE INTERFACIAL STRUCTURE AND PROPERTY OF Cu/Zn-Al/Al BRAZED JOINT. Acta Metall Sin, 2015, 51(3): 364-370.

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Abstract

The Cu/Al dissimilar metal joint is a compound structure that can efficiently decrease manufacturing costs, reduce product weight, and integrate the advantages of both metals. For the excellent comprehensive properties, the Cu/Al dissimilar metal joint has broad application prospects in air conditioners, refrigerators, cables, electronic components, solar collectors, et al. Brazing is considered as a promising method to join the Cu/Al dissimilar metal for lower residual stress, lower costs, higher precision and better adaption to the structure of joint. Meanwhile, the Zn-Al filler metal is considered as the relatively ideal filler metal due to better property of the Cu/Zn-Al/Al joint. However, the influence of the composition of the Zn-Al filler metal on the interfacial structure near Cu substrate and property of the Cu/Al joint has not been investigated. In this work, the Cu/Al joints were brazed by Zn-15Al, Zn-22Al, Zn-28Al, Zn-37Al and Zn-45Al filler metals, respectively. The influences of the composition of Zn-Al filler metals on the interfacial structure near Cu substrate of the Cu/Al joints were investigated, and the relationships of the composition of the Zn-Al filler metals, the interfacial structure and the shear strength of the Cu/Al joints were described systematically. It was found that the interfacial structure of the Cu/Zn-15Al/Al brazed joint was Cu/Al_4.2Cu_3.2Zn_0.7. For thinner Al_4.2Cu_3.2Zn_0.7 layer (2~3 μm), the shear strength of the joint was higher (66.3 MPa). With the increase of Al content of the filler metal, the thickness of Al_4.2Cu_3.2Zn_0.7 layer at the interface was increased for Cu/Zn-22Al/Al joint, even some CuAl₂ phase can be found nearby the Al_4.2Cu_3.2Zn_0.7 layer of Cu/Zn-28Al/Al joint, and the shear strength of the Cu/Al joints were decreased correspondingly. When the Cu/Al joint was brazed by the Zn-37Al filler metal, the interfacial structure near Cu substrate was transformed into Cu/Al_4.2Cu_3.2Zn_0.7/CuAl₂. For higher brittleness of CuAl₂ layer, the shear strength of the joint was decreased obviously (34.5 MPa). Finally, the interfacial structure of the Cu/Zn-45Al/Al joint was transformed into Cu/CuAl₂, the interfacial structure lead to the lower shear strength of the joint, which is only 31.6 MPa.

Key words: Cu/Al joint brazing interfacial structure intermetallic compound shear strength

ZTFLH:

TG425

Fund: Supported by Guangdong Provincial Science and Technology Project (No.2010A080402014)

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	Hao YANG
	Jihua HUANG
	Shuhai CHEN
	Xingke ZHAO
	Qi WANG
	Dehua LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00522 OR https://www.ams.org.cn/EN/Y2015/V51/I3/364

Table 1 Melting points and brazing temperatures of the Zn-Al filler metals

Fig.1 Schematic of the brazed specimen

Fig.2 SEM images of the interfacial zones near Cu substrate of the Cu/Al joints brazed with Zn-15Al (a), Zn-22Al (b), Zn-28Al (c), Zn-37Al (d) and Zn-45Al (e)

Fig.3 XRD spectra of the interfacial zones near Cu substrate of the Cu/Al joints brazed with Zn-15Al (a), Zn-22Al (b) and Zn-37Al (c)

Fig.4 Shear strength of Cu/Al joints brazed with Zn-Al filler metals

Fig.5 Fractographs of the Cu/Al joints brazed with Zn-15Al (a), Zn-22Al (b), Zn-28Al (c), Zn-37Al (d) and Zn-45Al (e)

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