Study on Microstructure and Property of Brazed Joint of AgCuZn-X(Ga, Sn, In, Ni) Brazing Alloy

Ga, Sn, In and Ni were added into AgCuZn cadmium-free brazing alloys. The influences of Ga, Sn, In and Ni on the microstructures and properties of AgCuZn brazing alloys were investigated. Mechanical properties of the butt and lap brazed joints were also tested. Results indicate that all AgCuZn-X(Ga, Sn, In, Ni) brazing alloys have low solidus and liquidus and acceptable mechanical properties. It is pointed out that the mechanical properties of the brazed joints are satisfactory due to the formation of fine network “characteristic gallium structure” when Ag and Ga contents are in a range of 30 wt%–56 wt% and 1 wt%–3 wt%, respectively, in the AgCuZn brazing alloy.