Ultrasonic brazing of SiC_p/Almatrix composites and Fe36Ni alloy

Fe36Ni alloy was joined to two kinds of SiC particle reinforced Al matrix composites(Al MCCs) of 45 SiC_p/2024 and 55% SiC_p/A356 by ultrasonic brazing with ZnAlSi filler metal. Moreover, the microstructure and fracture appearance of the joints was investigated by SEM and EDS, and the shear strength of the joints was evaluated through shear test. The differences of the microstructures, the strength and fracture appearance of the Fe36 Ni alloy and Al MCCs joints were analyzed in details. The results show that the filler metal and the base metalsat both sides can form a good metallurgical bonding by ultrasonic brazing, and SiC particles are uniformly distributed in the brazed seam. The shear strength of Fe36 Ni alloy with 45%SiC_p/2024 Al joint are about 110-145 MPa, which is more than that of Fe36 Ni alloy with 55% SiC_p/A356 joint of 75-85 MPa.The fracture occurs in the brazed seam of Fe36 Ni alloy with 45%SiC_p/2024 Al, while the joint of Fe36 Ni alloy with the 55% SiC P/A356 fractures on the interface of Fe36 Ni and the filler metal.