Phase field simulation of the phase separation in the TiC-ZrC-WC system

Abstract

The phase separation in the ZrC-TiC-WC pseudo-ternary system is investigated by actualizing a model based on Cahn-Hilliard equation in three-dimensional space. The simulation results show the solute diffusion of the three elements at different time and temperature, and the results are compared with the experimental results. The microstructural evolution is investigated by performing a statistical analysis during the spinodal decomposition. A sub-circular pattern is observed with the Ti- and W-rich regions embedded in the Zr rich matrix and the approximately the same shape and distribution. The number of Ti- and W-rich regions decreases and their averages size increases with time. The time required for completion of phase separation decreases with the increase of temperature. The simulation result of the phase separation in the ZrC-TiC-WC pseudo-ternary system is very similar to the experimental observation in element distribution. The laws and characteristics of microstructure evolution are well predicted in the ZrC-TiC-WC pseudo-ternary system.