LAUSR

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.