Распределение элементов в карбидах многокомпонентных сплавов системы Ni - Cr - Co - Al - W - Re - Ta - Mo - Nb - C

Abstract

Specific features of the distribution of alloying elements in the carbides of multicomponent alloys with base composition Ni - 5% Cr - 9% Co - 6% Al - 8.3% W - 4% Re - 4% Ta - 1% Mo - 1.5% Nb - 0.15% C are studied. The thermodynamic crystallization processes are simulated using the CALPHAD method. Dependences of the temperature of dissolution (precipitation) of carbides of the alloying elements are derived. The results of the thermodynamic computations of the chemical composition of the carbides are compared to experimental data obtained by electron microscopy (a REM-106I microscope with a system for energy dispersive x-ray spectrum analysis). The structure-and-energy condition of the carbide/matrix interfaces is assessed. It is shown that the dependences derived correlate well with the thermodynamic processes occurring in the system.