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Effect of element Zr in Ti-Zr–Ni-Nb system brazing filler alloys on the microstructure and strength of TiAl/TiAl joints

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Abstract

A series of Zr-Ti-Ni-Nb system filler alloys with different content of Zr were developed and fabricated for TiAl joining. The phase characteristics of typical joint interface microstructure were analyzed, and the effect of element Zr on the microstructure and strength of the joints was investigated. The results showed that when the content of Zr was 5 ~ 11 wt. %, the joint was composed of Ti2Al, Ti–Al-Ni, Ti3Al, Ti2AlNi dissolved with Zr. With the content of Zr was greater than 25 wt. %, elements Ni, Zr and Nb were enriched in the central part of the joint, and the predominant phase in the reaction zone of the joint was (Ti,Zr)2AlNi dissolved with Nb. The joint brazed with Zr(8 ~ 11)-Ti(Bal.)-Ni(18 ~ 21)-Nb(15 ~ 17) (wt. %) filler at 1010 °C for 10 min exhibited the maximum average the shear strength of 280.2 MPa. For the filler alloys with the Zr content of 40 wt. % and 60 wt. %, cracks were detected in the as-brazed joints.

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Acknowledgements

This research work was sponsored by National Natural Science Foundation of China under Grant (No. 51804286, No. 51671008 and No. 51701198). The authors also thank Beijing Natural Science Foundation under Grant No.3212014.

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Authors and Affiliations

  1. Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials, Beijing, 100095, People’s Republic of China

    Yong-Lai Shang, Xin-Yu Ren, Hai-Shui Ren, Yong-Juan Jing, Yao-yong Cheng & Hua-Ping Xiong

  2. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Shu-Jie Pang

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  1. Yong-Lai Shang
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  2. Xin-Yu Ren
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Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding

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Shang, YL., Ren, XY., Ren, HS. et al. Effect of element Zr in Ti-Zr–Ni-Nb system brazing filler alloys on the microstructure and strength of TiAl/TiAl joints. Weld World 66, 1437–1446 (2022). https://doi.org/10.1007/s40194-022-01274-9

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