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采用Kim模型,利用耦合溶质场的相场模型对Al-2-mole-Cu合金等温凝固过程中多晶粒相互影响下枝晶的生长过程进行数值模拟,为了提高计算效率,采用差分去实现宏微观场之间的耦合.研究了不同过冷度对多晶粒枝晶形貌和溶质分布的影响,结果表明:成分过冷对枝晶生长速度和溶质分配有着重大的影响,溶质元素Cu在固液界面前沿重新分布,结果导致实际热过冷减小,进而影响枝晶的生长和溶质向外层的扩散,致使相互接触的枝晶产生萎缩而其余没有受到抑制的枝晶生长方向产生择优现象.
Using the Kim model, the phase field model of coupled solute field was used to simulate the growth of dendrites under the influence of multi-grains during the isothermal solidification of Al-2-mole-Cu alloy. In order to improve the computational efficiency, Field.The effects of different undercooling on the dendrite morphology and solute distribution of polycrystalline grains were studied.The results show that the overcooling has a significant effect on the growth rate of dendrite and the distribution of solutes.The solute Cu Liquid interface front redistribution, resulting in the actual thermal over-cooling decreases, and thus affect the growth of dendrites and solute diffusion to the outer layer, resulting in contact dendrite shrinkage and the remaining uninhibited dendritic growth direction produced preferential .