中文摘要：

基于每个单元的溶质守恒,求解了合金凝固过程中溶质的扩散方程。考虑温度分布随时间变化,在绝热和高度过冷的液相中,对Al-Cu合金枝晶生长中液相和固相溶质的再分配进行了三维计算。在固定的笛卡尔网格上开发了数值算法以显式跟踪固/液界面,并进行了枝晶形貌演变模拟。

英文摘要：

The solute diffusion equation in solidification process was solved based on the solute conservation of each unit.Considering temperature distribution changing with time,the three-dimensional redistribution of liquid and solid phase solute in Al-Cu alloy dendrite growth was computed in the adiabatic and highly supercooled liquid phase. A numerical algorithm was developed to explicitly track the sharp solid/liquid（S/L） interface on a fixed Cartesian grid. And the evolution of dendrite morphology was simulated.