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龙伟民,赵月,钟素娟,张冠星,黄森.铜铝钎焊接头中的金属间化合物[J].稀有金属材料与工程(英文),2021,50(1):7~13.[W. M. Long,Y. Zhao,S. J. Zhong,G. X. Zhang and S. Huang.Intermetallic Compounds in The Copper-Aluminum Brazed Joints[J].Rare Metal Materials and Engineering,2021,50(1):7~13.]
Intermetallic Compounds in The Copper-Aluminum Brazed Joints
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Received:May 27, 2020  
Key words: intermetallic compounds  copper  aluminum  dissimilar brazing  factors impacting the Cu-Al joint  atomic diffusion
Foundation item:1、国家自然科学基金项目(面上项目,重点项目,重大项目)(项目号:U1904197);2、中原科技创新领军人才(项目号:ZYQR20180030)
Author NameAffiliation
W. M. Long,Y. Zhao,S. J. Zhong,G. X. Zhang and S. Huang  
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      This paper discussed the intermetallic compounds (IMCs) in the copper-aluminum brazed joints during formation and application through reviewing some recent research on brazing copper to aluminum. The review indicated that it was difficult to avoid the formation and growth of the IMCs, which depends on the mutual diffusion between Cu substrate and Al substrate as well as substrates and filler metals. Thermodynamics and kinetics are critical for the nucleation and growth of the IMCs respectively. Besides, defects (voids, cavities and cracks) in the joint mainly result from the formation and growth of the brittle IMCs because it always results in stress concentration as the source of cracks and accelerates the excessive consumption of the diffused atoms to form voids and cavities. Properties of copper-aluminum joints were severely deteriorated when the thickness of the IMCs exceeds 2~5μm. Finally, numerous factors (melting point, thermal conductivity, joint design, heat input and chemical composition) strongly impact the formation and growth of the IMCs through changing the mutual diffusion process. Moreover, these factors also have distinct effects on the defects. At present, some efficient methods used to control the IMCs in the copper-aluminum joints are heat input controlling, optimization of joint design and the addition of the third element into filler metals.