PHASE FIELD SIMULATION OF EQUIAXED DENDRITIC GROWTH DURING NON-ISOTHERMAL POLYCRYSTALLINE SOLIDIFICATION

The non-isothermal polycrystalline solidification of a binary alloy is simulated by employing a phase field model which takes into account the heat transition and the random crystallographic orientation. The stochastic nucleation is taken into account in the simulation through the Poisson seeding algorithm and a kinetic calculation for binary melts based on the classical nucleation theory. Different microstructures are obtained under various cooling conditions. It is found that the grain structure becomes finer with increasing the cooling rate, which agrees with experimental result.