Brazing of Tungsten Heavy Alloy and Fe-Ni-Co Based Superalloy by a Novel Cu-Ti Based Amorphous Filler

Abstract Cu-Ti based amorphous fillers were designed based on cluster-plus-glue-atom model to join tungsten heavy alloy (WHA) and Fe-Ni-Co based superalloy (GH907). The wettability of WHA by brazing fillers was analyzed, and the interfacial microstructures and mechanical properties of brazed joints were also investigated. High constituent homogeneity and excellent flowability of amorphous fillers facilitated the superior wettability and brazeability effectively. In addition, WHA substrate/ β − Ti /(Cu, Ni)(Ti, Zr)+(Cu, Ni)(Ti, Zr)2/(Fe, Ni)Ti+Fe2Ti/GH907 substrate were identified as typical microstructures of brazed joints, and the maximum joint shear strength of 340 MPa was obtained at 1050 °C for 10 min. The underlying joining mechanisms were addressed in view of diffusion-reaction behavior and dissolution-dilution effect of multiple alloying elements.