Vacuum brazing of Ti_3Al-based alloy using Ti-15Cu-15Ni brazing filler

Brazing of Ti3Al-based alloy(TD3)using Ti-15Cu-15Ni brazing filler was carried out at 960 ℃ for 1min,10min and 1 h.The results showed that the residual brazing filler became less gradually with the prolonging of the holding time.The needle-like α phase appeared at the central part of the joint brazed at 960 ℃ for 1 h,and the residual brazing filler disappeared at the joint.In the brazing seam the element Ti reacted with elements Ni and Cu and formed NiTi2 phase and CuTi3 phase respectively.