A phase-field model with antitrapping current for multicomponent alloys with arbitrary thermodynamic properties
A phase-field model with antitrapping current for multicomponent alloys with arbitrary thermodynamic properties
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DOI：
10.1016/j.actamat.2007.04.004
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发表时间：
2007-08
期刊：
影响因子：
9.4
通讯作者：
S. Kim
中科院分区：
文献类型：
--
作者：
S. Kim
为了预测工程合金在相变过程中的组织演变，发展准确、高效的相变计算工具是先决条件。尽管反陷阱相场模型（PFM）已经被开发出来，并越来越多地用于这一目的，它一直局限于稀二元合金。在这项研究中，反捕获PFM扩展到具有任意热力学性质的多组分系统。我们证明了在化学势跃变消失的条件下，多元扩散方程中的反俘获项与二元稀合金的情况一样保持不变。在薄界面极限下，导出了相场迁移率与真实的界面迁移率之间的关系，并证明了该关系中的多分量效应可以用一个简洁的矩阵形式表示。
The development of accurate and efficient computational tools for phase transformation is a prerequisite in order to predict the microstructure evolution during phase transformation in engineering alloys. Even though the antitrapping phase-field model (PFM) has been developed and is increasingly being used for this purpose, it has been limited to dilute binary alloys. In this study, the antitrapping PFM was extended to multicomponent systems with arbitrary thermodynamic properties. We showed that at the condition of vanishing chemical potential jump, the antitrapping term in the multicomponent diffusion equation remains unchanged with the case of binary dilute alloys. We then derived the relationship between the phase-field mobility and the real interface mobility at the thin interface limit, and showed that the multicomponent effect in the relationship can be expressed in a concise matrix form.