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 CBr₄-C₂Cl₆ eutectic alloy at low velocity. Three interface destabilization modes of eutectic lamellae, lamella annihilation, oscillatory instability and lamella nucleation, and the morphology selection of eutectic lamellae have reappeared veritably. With increasing of the initial lamella spacing, the stable morphology of the CBr₄-C₂Cl₆ eutectic alloy evolved in the sequence of lamella annihilation → stable growth → 1λO instability → 2λO instability → lamella nucleation. 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.