RESEARCH OF THE EQUAXIED DENDRITIC GROWTH IN THE UNDERCOOLED MELT OF THE PURE METAL BY PHASE-FIELD METHOD

A new way to improve computational efficiency of phase field is used to simulate the evolution of the equiaxed dendritic growth morphology in pure metal melt with initial dimensionless supercooling of 0.55. Much information about equiaxed dendritic growth has been got, which is in good agreement with experimental observation. The births of second arms and third arms have been simulated successfully by adding appropriate thermal noise. Furthermore, the dimensionless velocity and radius of the equiaxed dendritic axis' tip, and the Peclet number are computed, and the computational results by phase-field method are in good agreement with the ones by the microsolvability theory and the Ivantsov theory.