Effect of heat treatment on the interfacial microstructure and properties of Cu-Al joints

详细信息    查看全文

• 作者：Xue-Gang Wang ; Xin-Geng Li ; Feng-Jie Yan ; Cheng-Guo Wang
• 关键词：(IIW Thesaurus)Copper ; Aluminum ; Brazing ; Heat treatment ; Intermetallics
• 刊名：Welding in the World
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：61
• 期：1
• 页码：187-196
• 全文大小：
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669
• 卷排序：61

文摘

The purpose of this article is to study the effect of heat treatment on the interfacial microstructure and properties of the Cu-Al contact reaction brazed joint, and compare the results with a similar study performed on flash welding. The results show that the interfacial intermetallics in Cu-Al joint change from original two layers (Cu₉Al₄/CuAl₂) to three layers (Cu₉Al₄/CuAl/CuAl₂) both in contact reaction brazing and in flash welding. Some Kirkendall voids form during the growth of interfacial intermetallics. The voids in the contact reaction brazed joint form in the middle of interfacial intermetallic layer and lead a discontinuous crack after 500 h heat treatment. The voids in the flash welded joint form between copper and interfacial intermetallics and lead to a continuous crack after 500 h heat treatment. The growth rate of interfacial intermetallics conforms to the parabolic law for both joints. The relation between joint properties and the interfacial intermetallic thickness can be described by a linear function. The joint properties of contact reaction brazing are better than that of flash welding during the heat treatment. Therefore, contact reaction brazing is more preferred to maintain electrical stability and mechanical integrity of Cu-Al joint.