MULTI-PHASE FIELD SIMULATION OF EUTECTIC MORPHOLOGY SELECTION AND INTERFACE DESTABILIZATION

The KKSM multi-phase field model is employed to simulate the eutectic growth in thin-film unidirectional solidification of CBr_4-C_2Cl_6 eutectic alloy at low velocity.Three interface destabilization modes of eutectic lamellae,lamella annihilation,oscillatory instability and lamella nu- cleation,and the morphology selection of eutectic lamellae have reappeared veritably.With increasing of the initial lamella spacing,the stable morphology of the CBr_4-C_2Cl_6 eutectic alloy evolved in the sequence of lamella annihilation→stable growth→1γO instability→2λO instability→lamella nucle- ation.The simulation results are in agreement not only with Karma et al's calculated results but also with Ginibre et al's experimental results qualitatively.