通过KKSM多相场模型,分别研究了定向凝固条件下亚共晶、过共晶成分的CBr4-C2Cl6合金层片生长形貌选择规律.结果表明,随着初始层片间距的不断增加,亚共晶的形貌选择变化依次为:层片湮没→稳态生长→2λ0不稳定性→层片分叉与形核;而过共晶的形貌选择变化依次为:层片湮没→稳态生长→2λ0不稳定性→T-2λ0不稳定性→Tilt 生长→T-1λ0不稳定性.模拟结果不仅与理论计算的形貌选择图相符,而且与实验结果定性地一致.
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