Kinetics of isothermal phase transformations above and below the peritectic temperature: Phase-field simulations

摘要

We present phase-field simulations of isothermal phase transformations in the peritectic system below and above the peritectic tem perature. The physical processes involved are of different natures, involving either a triple junction or a liquid-film-migration (LFM) mechanism. Below the peritectic temperature, one of the solid phases steadily grows along the other. Above the peritectic temperature the phase transformation proceeds via the LFM mechanism. To the best of our knowledge, this mechanism has not been discussed in the literature as a generic process of phase transitions in peritectic systems. In addition to the LFM process, we also simulate melting along the solid-solid interface. Finally, we make a simplified linear stability analysis of the liquid film, supporting our simulation results.