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Vacuum brazing TiAl to Ti3Al using two Ti-based filler metals

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Abstract

Vacuum brazing of TiAl and Ti3Al was conducted with Ti–Zr–Cu–Ni and Ti–Zr–Fe filler metals. Microstructure and shear strength of TiAl/Ti3Al joints were investigated. The results indicated that the joint mainly consisted of Ti-rich, Ti2Al, and Ti3Al phases and residual filler metal. A columnar structure in all of the brazed seams adjacent to TiAl substrate was found, and it was resulted from the interdiffusion between filler metals and solid-state TiAl substrates. The fracture surface analysis demonstrated that the existence of excessive residual filler metal and the columnar structure was detrimental to joint strength. The joint brazed at 1050 °C for 5 min using Ti–Zr–Fe filler metal presented the maximum shear strength of 196.3 MPa, and the fracture mechanism was characterized by a mixture of cleavage and quasi-cleavage fracture.

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Acknowledgments

This research work was sponsored by Aeronautical Science Foundation of China under grant number 03H21009.

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Authors and Affiliations

  1. Department of Material Science and Engineering, Beihang University, 100191, Beijing, China

    H. S. Ren & S. J. Pang

  2. Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials, 100095, Beijing, China

    H. S. Ren, H. P. Xiong & B. Chen

Authors
  1. H. S. Ren
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  2. H. P. Xiong
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  3. B. Chen
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  4. S. J. Pang
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Corresponding author

Correspondence to H. P. Xiong.

Additional information

Doc. IIW-2551, recommended for publication by Commission XVII "Brazing, Soldering, and Diffusion Bonding".

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Ren, H.S., Xiong, H.P., Chen, B. et al. Vacuum brazing TiAl to Ti3Al using two Ti-based filler metals. Weld World 59, 639–646 (2015). https://doi.org/10.1007/s40194-015-0239-y

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  • DOI: https://doi.org/10.1007/s40194-015-0239-y

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