Three-dimensional phase-field crystal modeling of fcc and bcc dendritic crystal growth
Three-dimensional phase-field crystal modeling of fcc and bcc dendritic crystal growth
复制标题
面心立方和体心立方树枝状晶体生长的三维相场晶体建模
DOI：
10.1016/j.jcrysgro.2011.08.027
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发表时间：
2011-11-01
影响因子：
1.8
通讯作者：
Yu, Yan-Mei
中科院分区：
文献类型：
--
作者：
Tang, Sai;Backofen, Rainer;Yu, Yan-Mei
通过使用相场晶体模型（PFC），我们模拟了面心立方和体心立方结构的枝晶生长。研究了枝晶生长速度系数 C 的各向异性和生长动态缩放指数 n' 作为液相中 PFC 数密度 (psi) 的函数。我们获得了PFC枝晶尖端工作状态的稳定性准则，约为0.278（fcc）和0.104（bcc），大于宏观枝晶生长预测的0.025。这种分歧是由 PFC 表面能大各向异性区域的强刻面生长引起的。 (C) 2011 Elsevier B.V. 保留所有权利。
By using the phase-field crystal model (PFC), we simulate dendritic growth of face-centered cubic and body-centered cubic structures. The anisotropy of the dendritic growth velocity coefficient C and the growth dynamic scaling exponent n' are investigated as function of the PFC number density in the liquid phase (psi) over bar. We obtain the stability criterion of the operating state of the PFC dendrite tip, which is about 0.278 (fcc) and 0.104 (bcc), being larger than 0.025 predicted for the macroscopic dendritic growth. This disagreement is caused by the strongly faceted growth in the regime of large anisotropy of the PFC surface energy. (C) 2011 Elsevier B.V. All rights reserved.