We simulate thermodynamic processes of phase separation, which exert significant influence on the temperature characteristics of single-crystal refractory alloys based on nickel (RABN). By using an empirical approach, we deduce new relations for the ratios Kγ ′ and Kγ taking into account the joint influence of alloying elements on the temperature characteristics of multicomponent compositions of single-crystal alloys. It is shown that, as the ratio Kγ ′ increases, the critical temperatures become higher and, hence, the thermal stability of the entire system increases. The computed values of the critical temperatures for CMSX-10K alloy are in good agreement with the experimental values and their difference does not exceed 1%. We present the dependences of the ratio Kγ on the alloying system of RABN and analyze the effect of alloying on the liquidus temperature of the alloys. Finally, we present the ratios of the content of alloying elements and regression models with the help of which it is possible to predict the width of the range of crystallization temperatures and the optimal temperature of homogenization for specific alloys.

中文翻译：

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镍基单晶难熔合金相分离热力学过程的预测

我们模拟了相分离的热力学过程，这对基于镍的单晶难熔合金 (RABN) 的温度特性产生了重大影响。通过使用经验方法，考虑到合金元素对单晶合金多组分成分的温度特性的共同影响，我们推导出了比率 Kγ ' 和 Kγ 的新关系。结果表明，随着比值 Kγ' 的增加，临界温度变得更高，因此整个系统的热稳定性增加。CMSX-10K合金临界温度的计算值与实验值吻合良好，差异不超过1%。我们介绍了比率 Kγ 对 RABN 合金化系统的依赖性，并分析了合金化对合金液相线温度的影响。最后，我们提出了合金元素含量的比率和回归模型，借助这些模型可以预测特定合金的结晶温度范围和最佳均质化温度。