Anisotropic effect of equiaxed dendritic growth in a undercooled molten metal

Based on the Karma-Rappel phase field model, the equiaxed dendritic growth and change in temperature field in a pure molten metal were numerically simulated at an initial dimensionless supercooling of 0.45. Morphological evolvement of dendrites at various anisotropic coefficients was investigated. The result shows that anisotropic coefficient significantly affects the dendrite morphology. During dendritic growth, obvious necking phenomenon appears as the anisotropic coefficient is 0.05. The preferred growth direction of dendrites is always kept consistent with that of the highest temperature gradient.