Experimental investigation and thermodynamic calculation of the Co–Zn–Zr ternary system AITranslate

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DOI：https://doi.org/10.1016/j.calphad.2023.102640

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The phase equilibria of the Co–Zn–Zr ternary system were systematically studied by combining experimental analysis and thermodynamic modelling. The 450 °C isothermal section at the Zn-rich corner and the 600 °C isothermal section of Co–Zn–Zr system were studied by means of scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. Seventeen and ten three-phase regions were obtained at 600 and 450 °C isothermal sections, respectively. Three stable ternary compounds named τ1 (ZrCo2Zn20), τ2 (Zr5Co3Zn12) and τ3 (Zr10Co3Zn7) were found in the 600 °C isothermal section. Among them, the Bravais lattice symmetry of the τ2 phase is a simple tetragonal lattice, and its lattice parameters are a = 8.945 Å, b = 8.945 Å, c = 11.737 Å and α = β = γ = 90°. Based on the comprehensive evaluation of the current experimental results and the data reported in the literature, the thermodynamic description of the system was developed using the CALPHAD technique. A set of self-consistent thermodynamic parameters for the Co–Zn–Zr ternary system was obtained with good agreement between the experimental and calculated results.