Computer Simulation of Grain Growth in Dual-Phase Structures

摘要

Grain growth in dual-phase structures has been studied by computer simulation techniques using two-and three-dimensional lattice models. Grain coarsening in each phase follows the cube power law and growth rate constants depend on the morphology of the dual-phase structures. This is the result of mutual retardation of grain growth and is affected by the mutual wettability of both phases, which in itself is a function of the interfacial energy ratio σ_(αα)/σ_(αβ) and σ_(ββ)/σ_(αβ) between the two phases. The two-dimensional simulation, under various conditions of interfacial energies, are compared with the proposed relation between the mean grain radii and volume (or area) fractions of α and β phases, R_α/{f_α[(σ_(αα)/σ_(αβ) f_α +f_β]}~(1/2) = R_β/{f_β[f_α + (σ_(ββ)/σ_(αβ) · f_β]}~(1/2).