CuTiNiZrV Amorphous Alloy Foils for Vacuum Brazing of TiAl Alloy to 40Cr Steel. Issue 2 (February 2015)

• Record Type: Journal Article
• Authors: Dong, Honggang; Yang, Zhonglin; Wang, Zengrui; Deng, Dewei; Dong, Chuang
• Is Part Of: Journal of materials science & technology. Volume 31:Issue 2(2015:Feb.)
• Page Start: 217
• Page End: 222
• Publication Date: 2015-02
• Subjects: Titanium aluminide -- Steel -- Dissimilar metal joining -- Brazing -- Mechanical property; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2014.04.003
• Languages: English
• ISSNs: 1005-0302

Abstract

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 Cu43.75 Ti37.5 Ni6.25 Zr6.25 V6.25 (at.%) foil was flat and thin, containing Ti19 Al6 and Ti2 Cu intermetallic compounds; however, the diffusion layer brazed with Cu37.5 Ti25 Ni12.5 Zr12.5 V12.5 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.