The Interaction Between Interface Morphology of Particles with Anisotropic Effect of Interface Kinetics in an Alloy Melt

Abstract

AbstractThe conventional theory of crystal growth presents an irreversible outward increase of the crystal size through solute deposition on the nuclei; however, the asymptotic solution of the dynamics model of the particle reveals that the crystal growth undergoes a locally reversible inward growth process in the early stage of crystal growth. Immediately after nucleation, some parts of the interface first grow inward through solute rejection along certain crystal orientations from the interface of nucleation, while the other parts of the interface grow outward through solute deposition along other crystal orientations. Until the inward growth attains a certain distance, the interface grows outward along each crystal orientation. This growth behavior is attributed to the interaction between interface morphology of particles with the anisotropic effect of interface kinetics. Through a systematic variation of the anisotropy parameters, the particle exhibits a continuous transition from one growth morphology to other growth morphologies. During the morphological transition process, as initial concentration increases, the growth of the particle is inhibited in the preferred growth directions, whereas it is facilitated in other growth directions. As a result, the interface morphologies of the particle with different petal‐shaped morphologies in the early stage of crystal growth are formed.