Multi-phase-field modeling on morphology selection of off-eutectic CBr₄-C₂Cl₆ alloy lamellar growth

The KKSM multi-phase-field model is employed to study the morphology selection of lamellar hypo- and hypereutectic of CBr₄-C₂Cl₆ alloys respectively under the condition of unidirectional solidification. It's found that, with the increase of the initial lamellar spacing, for hypoeutectic, morphology evolves in the sequence of lamellae annihilation→stable growth→2λO instability→lamellae nucleation, while for hypereutectic, the evolution sequence is lamellae annihilation→stable growth→2λO instability→T-2λO instability→Tilt mode→T-1λO instability. Simulation results are in agreement not only with Karma et al.'s calculated results but also with Ginibre et al.'s experimental results qualitatively.