Abstract:Because of its excellent electrical and thermal conductivity and good corrosion resistance, Cu/Al composites are widely used in communication, electric power and new energy industries. As a composite material formed by connecting dissimilar metals, the biggest difficulty in the preparation process is to try to eliminate the defects caused by physical properties such as differences in coefficients of thermal expansion between dissimilar metals, so the interfacial organization at the connection is the main factor affecting its performance, so the research on this is very important and extensive. This paper summarized the types of interfacial intermetallic compounds (IMC) of Cu/Al composites under ultrasonic welding, friction stir welding, explosion welding and casting method, the formation mechanism and the commonly used auxiliary means to improve the properties of Cu/Al composites. The addition of trace elements in plasma welding and vacuum casting process, heat treatment after drawing and spinning, rolling and explosion welding, ultrasonic welding, rolling and electric pulse assistance. Researchers at home and abroad also widely used computer simulation technology to study the interfacial organization and properties of Cu/Al composites. Cu/Al composites were successfully prepared using self-developed impact jet composite casting process, with the interfacial organization of Al2Cu, AlCu, Al4Cu9, and the maximum bond strength of 23 MPa.