A three-dimensional cellular automaton model for dendritic growth in multi-component alloys
A three-dimensional cellular automaton model for dendritic growth in multi-component alloys
复制标题
多组分合金中枝晶生长的三维元胞自动机模型
DOI：
10.1016/j.actamat.2011.12.045
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发表时间：
2012-03-01
期刊：
影响因子：
9.4
通讯作者：
Zhu, Mingfang
中科院分区：
文献类型：
--
作者：
Zhang, Xianfei;Zhao, Jiuzhou;Zhu, Mingfang
建立了多元合金枝晶生长的三维元胞自动机模型。固体/液体（S/L）界面的前进速度的计算使用溶质守恒关系在S/L界面。考虑了合金元素之间的相互作用对溶质在固相和液相中扩散系数的影响。首先通过与二元和三元合金的理论预测进行比较，验证了该模型的有效性，然后通过热力学和动力学耦合计算，对Al-Cu-Mg合金的凝固过程进行了模拟。数值结果显示了自由枝晶生长过程和定向凝固过程。计算的Al-Cu-Mg合金定向凝固二次枝晶间距与实验结果吻合较好。讨论了各种合金元素之间的相互作用对枝晶生长的影响。(C)2012 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
A three-dimensional (3-D) cellular automaton model for dendritic growth in multi-component alloys is developed. The velocity of advance of the solid/liquid (S/L) interface is calculated using the solute conservation relationship at the S/L interface. The effect of interactions between the alloying elements on the diffusion coefficient of solutes in the solid and liquid phases are considered. The model is first validated by comparing with the theoretical predictions for binary and ternary alloys, and then applied to simulate the solidification process of Al-Cu-Mg alloys by a coupling of thermodynamic and kinetic calculations. The numerical results obtained show both the free dendrite growth process as well as the directional solidification process. The calculated secondary dendrite arm spacing in the directionally solidified Al-Cu-Mg alloy is in good agreement with the experimental results. The effect of interactions between :he various alloying elements on dendritic growth is discussed. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.