Influences of particle fractions on second-phase particles pinning grain coarsening processes

A two-dimensional cellular automata model for the second-phase particles pinning grain coarsening process was established based on a grain boundary/particle interaction model. Using this model, the grain coarsening processes for the systems of different volume fractions of the second-phase particles were simulated. The transformation of the grain coarsening mechanisms for low and high volume fractions of particles were numerically simulated for the first time. The reasons for this transformation were revealed by analyzing the interactions between the grain boundary and the second-phase particles in detail. To quantitatively describe the influences of the particle volume fractions on the grain coarsening kinetics, a novel formula for the grain coarsening kinetics considering the influences of particle volume fractions was established according to the simulation results. At last, the comparisons between the experimental results and the simulation results of the present model and other models showed that the present model should be more efficient in simulating the second-phase particle pinning grain coarsening processes than other models.