1. School of Automotive and Traffic Engineering, Jiangsu University of Technology, Changzhou 213001, China
2. School of Design, Hubei University of Automotive Technology, Shiyan 442002, China
et al.
In recent years, the wide application of brazing technology has led to the rapid development of brazing solders. Al-Si brazing solders has some advantages such as good fluidity and wettability, at the same time, it also has some disadvantages, such as high melting temperature, low strength, high weld crack sensitivity and liquid phase corrosion tendency, which restrict expansion of the application range of Al-Si brazing solders. In order to refine the alloy structure of Al-Si brazing solders, it can be modified by adding rare earth elements, so that the weld obtained excellent performance after brazing. Based on this, this paper reviews the effects of Ce, Y, Er, Yb and other rare earth elements on the microstructure and mechanical properties of aluminum alloy solders after brazing, and analyzes the mechanism of grain refinement. Based on the research progress of aluminum alloy solder at home and abroad, the problem of microstructure refinement in the development process of aluminum alloy solder is pointed out, and the future development of solder is prospected.