Phase equilibria and thermodynamic properties of the Ni-based superalloys are fundamental to design novel Ni-based superalloys with outstanding high temperature resistance properties. In order to develop the thermodynamic database of multi-component Ni-based superalloys with the elements Re, Ru and W, thermodynamic assessments of the Re-Ru, Ru-W and Re-Ru-W systems over the whole composition range were carried out using the CALPHAD (CALculation of PHAse Diagrams) method based on the available experimental phase equilibria data reported in the literature. The substitutional solution model was used to describe the solution phases including liquid, (Re), (Ru) and (W). The intermetallic compounds σ and χ were described by the sublattice models (Re,Ru,W)₁₀(W)₄(Re,Ru,W)₁₆ and (Re,Ru)₂₄(Re,W)₁₀(Re,Ru,W)₂₄, respectively. A set of self-consistent thermodynamic parameters for the Re-Ru, Ru-W and Re-Ru-W systems was obtained. Comparisons between the calculated results and experimental data show that most of the reliable experimental data can be reproduced by the present thermodynamic modeling.

镍基高温合金的相平衡和热力学性能是设计具有出色耐高温性能的新型镍基高温合金的基础。为了开发含有 Re、Ru 和 W 元素的多组分镍基高温合金的热力学数据库，在整个成分范围内对 Re-Ru、Ru-W 和 Re-Ru-W 系统进行了热力学评估使用基于文献中报道的可用实验相平衡数据的 CALPHAD（计算 PHAse 图表）方法。置换溶液模型用于描述溶液相，包括液体、（Re）、（Ru）和（W）。金属间化合物 σ 和 χ 由亚晶格模型描述 (Re,Ru,W) ₁₀ (W) ₄ (Re,Ru,W) ₁₆和(Re,Ru) ₂₄ (Re,W) ₁₀ (Re,Ru,W) ₂₄分别。获得了 Re-Ru、Ru-W 和 Re-Ru-W 系统的一组自洽热力学参数。计算结果与实验数据的比较表明，大多数可靠的实验数据可以通过目前的热力学模型重现。