Research of Simulation Dendritic Growth of Polycrystalline Non-isothermal Binary Alloys by Phase Field Method

Numerical simulation based on phase field method is developed to describe polycrystalline solidification of the non-isothermal binary alloy,the evolution of the interface morphology is showed and the effect of anisotropy parameter is formulated for Ni-Cu alloy.The results indicate that,with increase in time,all of nuclei grow from independence to competition.The nuclei grows into an asymmetry dendritic with a forced flow,that is,upstream dendritic arm is promoted,downstream is inhibited and tilts to down direction,and perpendicular arms have no obvious change,but tilts to upstream direction.The asymmetry of dendritic shape is intensified as the forced flow velocity is increased,where there is a secondary dendritic in the upstream direction of perpendicular arms,while there is no secondary dendritic in the downstream direction.With increase in anisotropic values or undercooling values,the size of every dendritic increase.