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Thermodynamic Assessment of the Co-Cr-Nb System

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Abstract

In this work, the Co-Cr-Nb ternary system was evaluated using the CALPHAD technique based on the experimental measurements of the isothermal sections at 1000, 1100 and 1200 °C. The solution phases including Liquid, Bcc, Fcc and Hcp were described by a substitutional solution model. The Laves phases were described by a two-sublattice model. The σ phase was described by a three-sublattice model of (Co,Nb)8Cr4(Co,Cr,Nb)18 and the μ phase was described by a four-sublattice model of Co1(Co,Cr,Nb)2(Nb)4(Co,Cr,Nb)6. The Co7Nb2 was treated as a stoichiometric compound. A set of self-consistent thermodynamic parameters for the Gibbs energies of individual phase in the Co-Cr-Nb system has been obtained which leads to a great fit between calculated results and experimented data. The calculated liquidus projection and reaction scheme of the Co-Cr-Nb ternary system have also been presented.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51831007) and National Key R&D Program of China (Grant No. 2017YFB0702901).

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Authors and Affiliations

  1. College of Materials and Fujian Provincial Key Laboratory of Materials Genome, Xiamen University, Xiamen, 361005, People’s Republic of China

    X. J. Liu, Q. Q. Zhang, Y. Lu, J. J. Han, Y. H. Guo, Z. F. Tao, Y. X. Huang & C. P. Wang

  2. Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, Guangdong, People’s Republic of China

    X. J. Liu, Y. X. Huang & C. P. Wang

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Liu, X.J., Zhang, Q.Q., Lu, Y. et al. Thermodynamic Assessment of the Co-Cr-Nb System. J. Phase Equilib. Diffus. 42, 217–230 (2021). https://doi.org/10.1007/s11669-021-00875-z

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