| 1 | Microstructures and Mechanical Properties of Vacuum Brazed Ti3Al/TiAl Joints Using Two Ti-based Filler Metals显示文摘Vacuum brazing of Ti3Al-based alloy to Ti Al was firstly carried out by Ti—15Cu—15Ni(wt%) filler metal.A continuous Ti3 Al band, Ti2 Ni and Ti2Cu/Cu3 Ti phases formed and the joint showed a shear strength of53.8–112.4 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 Ti3 Al and Ti Al 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 of20° and 21° on (Ti)_3Al and Ti Al substrate, respectively. The joint brazed with this novel filler mainly consisted of Ti-rich area, (Ti)_3Al 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)_3Al/Ti Al 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 of257.6 ± 33.6 MPa at room temperature and 304.8 ± 9.9 MPa at 600 °C. | H.S.Ren H.P.Xiong B.Chen S.J.Pang B.Q.Chen L.Ye | 2016 | Journal of Materials Science & Technology2016，32，4： | 12 |
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