Phase Field Simulation of Dendrite Growth of Coupling Coefficient Effecting

摘要

The phase-field coupling with the temperature distribution field is used to simulate the dendrite growth during isothermal solidification. The effects of coupling coefficient on the dendrite growth are studied. The results indicate that grain shape is hypertrophy dendritic crystal When the coupling coefficient is low. As coupling coefficient increases, the main branch of dendritic crystal become long and thin, and has the stable front interface. When the coupling coefficient is large, the dendrite growth becomes very complicated and the front interface of it is very unstable. Meanwhile, the temperature distribution field of main branch tip increases slowly first, then decreases; in addition to the main branch, the temperature field increases monotonously.