Production of brazed joints in gamma-TiAl and selection of compositions of brazing alloys are hampered by narrow ranges of concentrations of alloying elements within which no deterioration of mechanical properties or performance of base metal occurs. The rate of diffusion of many components of brazing alloys can be substantially slowed down due to formation of intermetallic phases with aluminium.

Available brazing filler metals of the Ti-Cu-Ni, Cu-Ni and Ti-Zr-Cu-Ni systems fail to provide properties of brazed joints close to those of base metal, or require a long-time high-temperature heat treatment that leads to deterioration of properties of the base metal.

This study considers the possibility of producing brazed joints close in mechanical properties and structure to the base metal using alloys based on the Ti-Zr-Fe and Ti-Zr-Mn systems as the brazig filler metals. Butt brazed joints in gamma-TiAl (47XD) were made by the vacuum brazing method, their mechanical properties were evaluated, and microstructure and chemical heterogeneity of the seams was examined.
         As shown by tests of the butt brazed joints to short-time strength, brazing using the developed filler metals provides strength of the joints at a level of 600-690 MPa at 20°C and 280-310 MPa at 700°C. The long-time strength tests conducted at 700°C (under load 200 MPa) showed that some systems of  brazing filler metals provided strength of the brazed joints equal to that of the base metal.