Phase separation dynamics in binary systems containing mobile particles with variable Brownian motion

摘要

This study investigates the spinodal decomposition dynamics in binary mixtures containing mobile particles by combining the Cahna??Hilliard equation with Langevin dynamics for particles with Brownian motionchanges proportional to their mobility. We solve the Cahna??Hilliard equation numerically using a semi-implicit Fourier spectral method, and show that the domain growth rate first increases with the increase in particle mobility, and then decreases. The effect of filler particle concentration on the domain growth depends on its mobility: whenthe particle mobility is low, the domain growth rate decreases with the increase in particle concentration; whereas when the particle mobility is high, the domain growth rate decreases and then increases and finally decreases again with the increase in particle concentration. The proposed model suggests the possibility of controlling macroscopicbehaviour of binary alloys by altering filler particle properties.