Abstract
Vacuum brazing of Ti 3 Al-based alloy to TiAl was firstly carried out by Ti 15Cu 15Ni (wt%) filler metal. A continuous Ti 3 Al band, Ti 2 Ni and Ti 2 Cu/Cu 3 Ti phases formed and the joint showed a shear strength of 53.8–112.4 MPa at room temperature. For the improvement of the joint strength, a new Ti Zr Cu Ni Fe filler alloy was designed, and its wettability on Ti 3 Al and TiAl substrate was studied with the sessile drop method. After holding for 20 min at 1010 °C the Ti Zr Cu Ni Fe filler showed a low contact angle of 20° and 21° on Ti 3 Al and TiAl substrate, respectively. The joint brazed with this novel filler mainly consisted of Ti-rich area, Ti 3 Al reaction layer and residual filler metal. With the increase of the brazing temperature, the amount of residual filler metal decreased and the Ti 3 Al reaction layer thickened. The Ti 3 Al/TiAl joint brazed with Ti Zr Cu Ni Fe filler exhibited a lower hardness than that brazed with Ti Cu Ni filler. The corresponding joints brazed at 950 °C for 5 min presented the shear strength of 257.6 ± 33.6 MPa at room temperature and 304.8 ± 9.9 MPa at 600 °C.
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