Dendritic Growth Simulation of Polycrystalline for Pure Material by Phase Field Method

Numerical simulation based on phase field method is developed to describe polycrystalline solidification for pure material,the evolution of the interface morphology is showed and the effect of anisotropy parameter is formulated for Nickel.The results indicate that,with increasing time,all of nuclei grow from independence to competition.The nuclei grow into an asymmetry dendritic with a forced flow.As the forced flow velocity is increased,the asymmetry of dendritic shape is intensified for A dendritic,where tip quasi-steady vecolity of upstream arm gradually increases,those for downstream arm and perpendicular arm gradually decrease.With increase in anisotropic values or undercooling values,the size of every dendritic increase,in which the enhancement of upstream arm for A dendritic is fastest among various direction dendritic arm.In addition,when the nuclei number increase,the interaction of nuclei is intensified,and the shape of A dendritic is tightened.