The phase equilibria of the Cu–Cr–Si ternary system were investigated via thermodynamic modeling coupled with key experiments. Seventeen ternary alloys were prepared to determine the isothermal sections of the Cu–Cr–Si system at 700 and 800 °C by combining X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS). No ternary compound was found. The solubilities of the third element in binary compounds in the Cu–Si and Cr–Si systems were measured. Based on the thermodynamic descriptions of three constitutive binary systems available in the literature as well as the experimental phase equilibria data obtained from the present work and literature, thermodynamic re-assessment of the Cu–Cr–Si system was carried out by the CALPHAD (CALculation of PHAse Diagrams) approach. The substitutional model and sublattice model were used to describe the solution phases and intermediate phases, respectively. A set of thermodynamic parameters of the Cu–Cr–Si system was obtained. The calculated isothermal sections and vertical section are in good agreement with most of the reliable experimental data. The liquidus projection and reaction scheme of the Cu–Cr–Si system over the whole composition were also presented.

Cu-Cr-Si三元体系的相平衡通过研究热力学建模与关键实验相结合。通过将 X 射线衍射 (XRD) 和扫描电子显微镜与能量色散 X 射线光谱 (SEM/EDS) 相结合，制备了 17 种三元合金，以确定 700 和 800 °C 下 Cu-Cr-Si 系统的等温截面。未发现三元化合物。测量了 Cu-Si 和 Cr-Si 系统中第三种元素在二元化合物中的溶解度。基于文献中可用的三种本构二元体系的热力学描述以及从目前的工作和文献中获得的实验相平衡数据，通过 CALPHAD（CALculation PHAse 图）方法。替代模型和亚晶格模型分别用于描述溶液相和中间相。获得了一组 Cu-Cr-Si 系统的热力学参数。计算得到的等温截面和垂直截面与大部分可靠的实验数据吻合良好。还介绍了 Cu-Cr-Si 系统在整个组合物中的液相线投影和反应方案。