Microstructure and Mechanical Properties of Ultrasonically Assisted Brazing of Dissimilar Cu-Al Alloys

被引：5
|
作者：
Dai, Jun [1 ,2 ]
Yu, Banglong [1 ,3 ]
Yang, Li [1 ]
Zhang, Yaocheng [1 ]
Liu, Zili [2 ]
Liu, Po [4 ]
机构：
[1] Changshu Inst Technol, Sch Automot Engn, Changshu 215500, Jiangsu, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Sch Mat Sci & Technol, Nanjing 211100, Jiangsu, Peoples R China
[3] Soochow Univ, Sch Mech & Elect Engn, Suzhou 215006, Peoples R China
[4] Guilin Univ Aerosp Technol, Sch Mech Engn, Guilin 541004, Peoples R China
来源：
SCIENCE OF ADVANCED MATERIALS | 2020年 / 12卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Sn-Zn Solder; Ultrasonic-Assisted Brazing; Dissimilar Metal Joints; Microstructure; First-Principles Calculations; 1ST PRINCIPLES; JOINTS;
D O I：
10.1166/sam.2020.3722
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
An ultrasonic assisted brazing method, without flux and conducted in air, was developed to braze dissimilar copper-aluminum (Cu/Al) alloys. The microstructure and properties of Cu/Al joints of Sn-9Zn eutectic solder with different parameters were studied. The results show that the Intermetallic Compound (IMC) of the Sn-9Zn/Cu interface is mainly composed of Cu5Zn8 and Cu6Sn5. According to first-principles calculations, the covalent bond formed by Cu and Zn atoms in Cu5Zn8 is weak, whereas the covalent bond formed by Cu atoms and Sn atoms in Cu6Sn5 is strong. In the absence of ultrasonically assisted brazing, the shear performance of the joint at 220 degrees C is 21.8 MPa. At the same temperature, the performance of the joint with the ultrasonically bonded 10 s is 36.8 MPa, which represents an average increase of 68% compared to the non-ultrasonic welding joints.
引用
收藏
页码：733 / 739
页数：7
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