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Development of a Diffusion Mobility Database for Co-Based Superalloys

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Abstract

To facilitate the development of high-temperature Co-based γ-γ′ superalloys, a Co-Ni based diffusion mobility database is developed for the eight component FCC (Face Centered Cubic) system of Co-Al-W-Ni-Cr-Ti-Ta-Re. A CALPHAD approach is used to represent the temperature and composition dependency of the multicomponent system. The mobility descriptions were based on previous assessment work for the Ni-based superalloys, published experimental and computational data, and established diffusion correlations. The initial mobility descriptions were then refined using additional diffusion couple experimental data, particularly for the Co-Cr, Co-Ta, and Ni-Ta systems. After re-optimizing the descriptions with the new experimental data, the mobility descriptions were validated using a collection of published diffusion couple composition profiles, which were not included in the initial assessment process.

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Notes

  1. Note all compositions are given in mole fraction unless otherwise stated.

  2. Commercial names for instruments and software are used for completeness and do not constitute an endorsement from NIST.

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Acknowledgments

WT acknowledges financial support from awards 70NANB14H012 and 70NANB19H005 from U.S. Department of Commerce, National Institute of Standards and Technology as part of the Center for Hierarchical Materials Design (CHiMaD).

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Authors and Affiliations

  1. Department of Material Science and Engineering, Royal Institute of Technology (KTH), Brinellvägen 23, Stockholm, Sweden

    Greta Lindwall

  2. Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD, USA

    Kil-Won Moon, Maureen Williams & Carelyn Campbell

  3. Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA

    Whitney Tso

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  1. Greta Lindwall
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Correspondence to Carelyn Campbell.

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This invited article is part of a special tribute issue of the Journal of Phase Equilibria and Diffusion dedicated to the memory of former JPED Editor-in-Chief John Morral. The special issue was organized by Prof. Yongho Sohn, University of Central Florida; Prof. Ji-Cheng Zhao, University of Maryland; Dr. Carelyn Campbell, National Institute of Standards and Technology; and Dr. Ursula Kattner, National Institute of Standards and Technology.

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Lindwall, G., Moon, KW., Williams, M. et al. Development of a Diffusion Mobility Database for Co-Based Superalloys. J. Phase Equilib. Diffus. 43, 931–952 (2022). https://doi.org/10.1007/s11669-022-01011-1

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  • DOI: https://doi.org/10.1007/s11669-022-01011-1

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