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Thermodynamic Calculation of Phase Equilibria in the C-Mo-Zr System

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Abstract

The C-Mo-Zr system was assessed by means of the CALPHAD approach. All of the phase equilibria available from the literature were critically reviewed. The liquid was modeled as substitutional solution phase, while the carbides including fcc-(Mo,Zr)C1−x, bcc-(Mo), bcc-(Zr), hcp-Mo2C, hcp-(Zr) and η-MoC were described by using corresponding sublattice models. The laves-Mo2Zr and shp-MoC phases were considered as binary compounds with no solubility for the third component. The existence of ternary phase was not reported in this system. The modeling of C-Mo-Zr ternary system covers the entire composition and temperature ranges, and a set of self-consistent thermodynamic parameters for the C-Mo-Zr system was systematically optimized. Comprehensive comparisons between the calculated and reported phase diagram data show that the reliable information is satisfactorily accounted for by the present modeling. The liquidus projection and reaction scheme of the C-Mo-Zr system were also generated based on the present thermodynamic assessment.

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Acknowledgments

The financial supports from the National Key Research and Development Program of China (Grant No. 2016YFB0700503), National Natural Science Foundation of China (Nos. 51701013 and 51172018), Postdoctoral Science Foundation of China (Grant No. 2017M610765), Fundamental Research Funds for the Central Universities (Grant No. FRF-TP-17-005A1) and Kennametal Inc. are greatly acknowledged. The authors thank Prof. Olga Fabrichnaya at TU Bergakademie Freiberg of Germany for providing key references.

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Authors and Affiliations

  1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, PR China

    Cong Zhang & Haiqing Yin

  2. Shandong Lutai Holding Group Co., Ltd., Jining, 272100, Shandong, PR China

    Chuanlong Zhao

  3. Beijing Key Laboratory of Materials Genome Engineering, Beijing, 100083, PR China

    Haiqing Yin

  4. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, PR China

    Xuanhui Qu

  5. Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing, 100083, PR China

    Xuanhui Qu

  6. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, PR China

    Yong Du

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Correspondence to Cong Zhang.

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Zhang, C., Zhao, C., Yin, H. et al. Thermodynamic Calculation of Phase Equilibria in the C-Mo-Zr System. J. Phase Equilib. Diffus. 39, 766–777 (2018). https://doi.org/10.1007/s11669-018-0664-x

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  • DOI: https://doi.org/10.1007/s11669-018-0664-x

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