Microstructures and Mechanical Properties of Vacuum Brazed Ti3Al/TiAl Joints Using Two Ti-based Filler Metals

doi:10.1016/j.jmst.2015.11.018

Abstract

Abstract: Vacuum brazing of Ti₃Al-based alloy to TiAl was firstly carried out by Ti——15Cu——15Ni (wt%) filler metal. A continuous Ti₃Al band, Ti₂Ni and Ti₂Cu/Cu₃Ti 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 Ti₃Al 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 Ti₃Al and TiAl substrate, respectively. The joint brazed with this novel filler mainly consisted of Ti-rich area, Ti₃Al reaction layer and residual filler metal. With the increase of the brazing temperature, the amount of residual filler metal decreased and the Ti₃Al reaction layer thickened. The Ti₃Al/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.

Key words: Brazing, Titanium aluminides, Microstructure, Shear strength

H.S. Ren, H.P. Xiong, B. Chen, S.J. Pang, B.Q. Chen, L. Ye. Microstructures and Mechanical Properties of Vacuum Brazed Ti₃Al/TiAl Joints Using Two Ti-based Filler Metals[J]. J. Mater. Sci. Technol., 2016, 32(4): 372-380.

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Microstructures and Mechanical Properties of Vacuum Brazed Ti₃Al/TiAl Joints Using Two Ti-based Filler Metals

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