Vacuum brazing of TiAl-based alloy using Ti-Zr-Fe filler metal

A Ti-Zr-Fe brazing alloy was designed and fabricated into foils by rapid solidification technique for joining of TiAl-based alloy. The phase characteristics of typical joint interface microstructure were analyzed, and the influence of process parameters on the interfacial microstructure and mechanical properties was discussed. The results showed that the joint interface consists of Ti 2 Al, Ti 3 Al (Zr, Fe), Ti-based solid solution, and (Ti, Zr) 2 Fe phase enriched with 10.0~15.0 at.% Al. Under the brazing condition of 1283 K/10 min, the joints exhibited a shear strength of 221.3 MPa. The joint showed a brittle fracture and the fracture propagated through the entire brazing seam.