Semisolid stirring brazing of SiCp/A356 composites with Zn27Al filler metal in air

The semisolid brazing process of SiCp/A356 composites was investigated. The effects of temperature on the microstructure of the filler metal and the joints are discussed in this paper. The research results show that with increasing temperature, the solid fraction of the filler metal decreases. Moreover, the SiCp/A356 composites can be effectively joined with the semisolid filler metal by optimising the stirring temperature. It can be found that most of the oxide film on the surface of the composites is disrupted by mechanical stirring. In this case, the metallurgical bonds formed at the interface between the filler metal and the base materials. Since the semisolid temperature range of the filler metal is narrow, the accurate controlling of the weld pool temperature must be considered.