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Joining of TiAl-based alloy and a Ni-based superalloy with a NiCoFeCuSiB high entropy filler metal

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Abstract

To explore the potential significance of high entropy alloys for the joining of extremely dissimilar materials, a NiCoFeCuSiB high entropy alloy was newly designed and used as filler metal to braze TiAl-based alloy and a deformed Ni-based superalloy. The microstructures at the joining interfaces were investigated. The as-cast NiCoFeCuSiB high entropy filler alloy was mainly composed of (Co,Fe,Ni) solid solution and (Ni,Co,Fe,Cu,Si) multi-element complex phase. The wettability experiment results indicated that a lower contact angle and better spreading behavior was obtained on the Ni-based superalloy than TiAl-based alloy at 1120 °C/10 min. At the interface of Ni-based superalloy/NiCoFeCuSiB filler, (Ni,Fe,Cr,Co,Cu,Ti,Al) multi-element complex phase was formed and sound metallurgical bonding was achieved. For the interface close to TiAl-based alloy, the diffusion affect zone consisted of γ-TiAl and γ-TiAl(Cu,Ni) phases was visible. The brazed seam was mainly composed of (Ni,Al,Ti,Fe,Co), (Ni,Al,Ti,Co,Fe,Cu), and (Ni,Fe,Cr,Co,Cu,Ti,Al) multi-element complex phases.

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Funding

This research work was sponsored by the National Natural Science Foundation of China (No. 51705489, No. 51671008).

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Authors and Affiliations

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

    H. S. Ren, H. L. Feng, X. Y. Ren, Y. Y. Cheng & H. P. Xiong

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

    S. J. Pang

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  1. H. S. Ren
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  2. H. L. Feng
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  3. X. Y. Ren
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  4. S. J. Pang
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  6. H. P. Xiong
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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., Feng, H.L., Ren, X.Y. et al. Joining of TiAl-based alloy and a Ni-based superalloy with a NiCoFeCuSiB high entropy filler metal. Weld World 66, 557–565 (2022). https://doi.org/10.1007/s40194-021-01245-6

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  • DOI: https://doi.org/10.1007/s40194-021-01245-6

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