CuTiNiZrV Amorphous Alloy Foils for Vacuum Brazing of TiAl Alloy to 40Cr Steel

doi:10.1016/j.jmst.2014.04.003

J. Mater. Sci. Technol. ›› 2015, Vol. 31 ›› Issue (2): 217-222.DOI: 10.1016/j.jmst.2014.04.003

• Orginal Article • Previous Articles Next Articles

CuTiNiZrV Amorphous Alloy Foils for Vacuum Brazing of TiAl Alloy to 40Cr Steel

Honggang Dong^{1, 2}, Zhonglin Yang¹, Zengrui Wang¹, Dewei Deng¹, Chuang Dong³

1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China; 2 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China; 3 Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116085, China

Received:2013-09-23 Online:2015-02-20 Published:2015-07-23
Contact: Corresponding author. Ph.D.; Tel.: +86 411 84706283; Fax: +86 411 84709284.E-mail address: donghg@dlut.edu.cn (H. Dong).
Supported by:
This work was financially supported by the State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, China, the National Natural Science Foundation of China (Grant No. 51374048), the National Basic Research Program of China (“973 Program”, Grant No. 2011CB013402), and the Fundamental Research Funds for the Central Universities.

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 Cu_43.75Ti_37.5Ni_6.25Zr_6.25V_6.25 (at.%) foil was flat and thin, containing Ti₁₉Al₆ and Ti₂Cu intermetallic compounds; however, the diffusion layer brazed with Cu_37.5Ti₂₅Ni_12.5Zr_12.5V_12.5 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.

Key words: Titanium aluminide, Steel, Dissimilar metal joining, Brazing, Mechanical property

Honggang Dong, Zhonglin Yang, Zengrui Wang, Dewei Deng, Chuang Dong. CuTiNiZrV Amorphous Alloy Foils for Vacuum Brazing of TiAl Alloy to 40Cr Steel[J]. J. Mater. Sci. Technol., 2015, 31(2): 217-222.

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CuTiNiZrV Amorphous Alloy Foils for Vacuum Brazing of TiAl Alloy to 40Cr Steel

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