CuTiNiZrV Amorphous Alloy Foils for Vacuum Brazing of TiAl Alloy to 40Cr Steel |
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| Authors: | Honggang Dong;Zhonglin Yang;Zengrui Wang;Dewei Deng;Chuang Dong; |
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| Affiliation: | Honggang Dong;Zhonglin Yang;Zengrui Wang;Dewei Deng;Chuang Dong;School of Materials Science and Engineering,Dalian University of Technology;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology;Key Lab of Materials Modi fi cation (Dalian University of Technology),Ministry of Education; |
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| Abstract: | Vacuum brazing of TiAl alloy to 40Cr steel sheets was conducted with newly developed CuTiNiZrV amorphous foils. It was found that a diffusion layer,filler metal and reaction layer existed in the brazed seam. The diffusion layer in the joint brazed with Cu43.75Ti37.5Ni6.25Zr6.25V6.25(at.%) foil was flat and thin,containing Ti19Al6 and Ti2Cu intermetallic compounds; however,the diffusion layer brazed with Cu37.5Ti25Ni12.5Zr12.5V12.5 foil was uneven with bulges,consisting of essentially Ti-based solute solution. The foil with 12.5 at.% V showed inferior spreadability compared to that with 6.25 at.% V at brazing temperature. However,fracture happened along the diffusion layer with 6.25 at.% V foil due to the formation of brittle intermetallic phases,but the joints brazed with 12.5 at.% V foil failed through the TiAl substrate. These results show that designing amorphous alloy with less Ti and more V for brazing TiAl alloy to steel is appropriate. |
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