Analysis of higher-order corrections to the interface kinetics in the multiphase field method

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• 作者：Yasutaka Nishida^a ; ^{yasutaka.nishida@toshiba.co.jp} ; Satoshi Itoh^b
• 关键词：Phase field modeling ; Multiphase field method ; Phase-transformation kinetics ; Grain growth ; Microstructure
• 刊名：Acta Materialia
• 出版年：2012
• 期刊代码：1_13596454
• 类别：ms
• 出版时间：June, 2012
• 卷：60
• 期：10
• 页码：4077-4084
• 文件大小：548 K

摘要

The multiphase field method has been developed in material science on the mesoscopic scale as a powerful tool to simulate complex microstructure formation. There are different model formulations in the multiphase field method for the analysis of the microstructure that develops in low-carbon steels, such as 纬-to-伪 transformation. One is the general type derived rigorously from a free-energy formulation, and another is the antisymmetric type where only dual interface interaction is taken into account. The difference between them reflects the higher-order corrections of the interface kinetics. In this paper, a comparative study of them is performed in detail. First, we show the relationship between them analytically, and then we compare their multiphase field modeling for grain growth and 纬-to-伪 transformation numerically using equivalent model parameters in two dimensions. As a result, although we find that both models give almost the same results for the volume fraction of 伪-phase, they have different morphologies near triple junctions. These differences are caused by higher-order corrections of the interaction between grains.