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Microstructures and mechanical properties of Ti3Al/Ni-based superalloy joints diffusion bonded with Ni and TiNiNb foils

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Abstract

Dissimilar joining of Ti3Al-based alloy to Ni-based superalloy has been conducted with diffusion bonding method using Ni foil and TiNiNb alloy as interlayer. For the Ni foil, with the increase of bonding temperature, the joint strength increased firstly and then decreased. The joints bonded at 980 °C for 20 min with a pressure of 20 MPa presented the maximum shear strength of 207 MPa at room-temperature. During the bonding process, Ni foil reacted with Ti3Al-based alloy due to the strong affinity between elements Ti and Ni. The formation of Ni2Ti, AlNi2Ti, and Ni3Ti compounds at Ti3Al/Ni interface limited the mechanical properties of the joint. The use of the TiNiNb alloy decreased the formation tendency of brittle Ti-Ni phases to some extent and only little Ti2Ni phase was visible in the joint. The shear strength of 209 MPa was obtained under the condition of 980 °C/10 min/20 MPa, close to that obtained through Ni foil. The (Ni,Ti,Nb,Fe,Cr) multi-component phase formed at TiNiNb/GH536 interface became the new weak link of the joint.

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Acknowledgements

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

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Authors and Affiliations

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

    H. S. Ren, X. Wu, B. Chen, H. P. Xiong & Y. Y. Cheng

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  1. H. S. Ren
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  2. X. Wu
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  3. B. Chen
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  4. H. P. Xiong
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  5. Y. Y. Cheng
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Correspondence to H. P. Xiong.

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Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding

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Ren, H.S., Wu, X., Chen, B. et al. Microstructures and mechanical properties of Ti3Al/Ni-based superalloy joints diffusion bonded with Ni and TiNiNb foils. Weld World 61, 375–381 (2017). https://doi.org/10.1007/s40194-016-0415-8

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  • DOI: https://doi.org/10.1007/s40194-016-0415-8

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