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Thermodynamic Modeling of the Co-Cu-Sn Ternary System

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Abstract

The Co-Cu-Sn ternary system has been modeled based on reported phase equilibrium data in the literature using the CALPHAD (CALculation of PHAse Diagrams) method. The excess Gibbs energies of solution phases, including liquid, Bcc, Fcc and Hcp, are expressed by the Redlich-Kister polynomial. The two-sublattice model (Co,Cu)m(Sn)n is used to describe the solid solution of binary intermetallic compounds, i.e. CoSn3, CoSn2 Cu3Sn and βCu6Sn5 in the Co-Cu-Sn ternary system. Co3Sn2 was described using the four-sublattice model (Co,Cu,Sn)1(Cu,Sn)1(Co,Va)0.5(Co,Va)0.5. The ternary stoichiometric compound Co2Cu8Sn3 is modeled by the stoichiometric model, Co2Cu7.5Sn3. Finally, a set of self-consistent parameters which can describe the thermodynamics of the Co-Cu-Sn ternary system was obtained. Based on the calculated thermodynamic parameters, the liquidus projection and reaction scheme are also derived in the present work.

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Acknowledgment

The financial supports from the National Natural Science Foundation of China (Nos. 52171024 and 51871186) and the National Key Research and Development Program of China (Materials Genome Initiative: 2017YFB0701700) are gratefully acknowledged. The authors thank the support from the High-Performance Computing Center of Central South University.

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  1. Powder Metallurgy Research Institute, Central South University, Changsha, 410083, Hunan, China

    Dongyu Cui & Jiong Wang

  2. School of Physical Science and Technology, Northwestern Polytechnical University, Xian, 710072, China

    Na Yan

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Cui, D., Wang, J. & Yan, N. Thermodynamic Modeling of the Co-Cu-Sn Ternary System. J. Phase Equilib. Diffus. 43, 214–228 (2022). https://doi.org/10.1007/s11669-022-00953-w

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