Optimization of correlative Parameters in Numerical Simulation of Denddtic Dendritic Crystal Growth in Al-4.5%Cu alloy Using Phase-field Model

Isothermal dendritic crystal growth in AI-4.5%Cu alloy is simulated by using the phase-field model。The influence of the mesh size,anisotropy strength and interface thickness on dendritic growth is investigated.The calculated results show that the secondary arms develop well and the tip becomes smooth with decreasing the mesh size.The lower anisotropy strengh makes the secondary arms grow in different direction,and the higher anisotropy strength results in error noise. The greater the interface thickness,the stronger tendency to form side-branches on secondary arms.The thinner interface thickness leads to the dendritic growth subject to the sharp interface condition. Finally,the optimized parameters are deduced.