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本文评述了广泛应用于描述平衡态和动态偏析的修正Darken模型。该模型首次提出了偏析的驱动力是化学势梯度,并成功地应用于定量描述体块材料的平衡态和动态的表面偏析。在考虑到薄膜体系中的尺寸效应后,引入了一个约束条件,再将其应用于修正的Darken模型,实现了在所有的浓度和薄膜厚度范围内,对合金薄膜体系的平衡态和动态的表面偏析的模拟计算。并利用该模型模拟了N(i111)Cu二元合金薄膜系统的平衡态和动态的表面偏析。
This article reviews modified Darken models that are widely used to describe equilibrium and dynamic segregation. The model first proposed that the driving force of segregation is a chemical potential gradient and has been successfully applied to quantitatively describe the equilibrium state and dynamic surface segregation of bulk materials. After considering the size effect in the thin film system, a constraint was introduced and then applied to the modified Darken model to achieve the equilibrium and dynamic surface of the alloy thin film system at all concentrations and film thicknesses Segregation simulation calculation. The model was used to simulate the equilibrium and dynamic surface segregation of N (i111) Cu binary alloy thin film system.