Interface Microstructure and Mechanical Properties of SiCp/2014Al Aluminum Matrix Composite Vacuum Brazing Joint

This paper describes the brazing technique of SiCp/2014Al aluminum matrix composite. The surface reinforcements were partly exposed and the surface was deposited by vapor deposition process. Observing the microstructure of the brazing joint, Cu and M6 aluminum filler metal are more adaptable for the brazing process than Ti and 4047 aluminum filler metal. The tensile strength of the as-welded joint can reach 181MPa. The fractography of the brazing joint indicates that the fill metal can not wet the parent composite, which is the main reason for the loss of strength. Furthermore, the porosity caused by high brazing temperature and the aggregated reinforcement on the parent composite are two other important reasons for the brazing joint strength lost.