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相场法模拟多元合金过冷熔体中的枝晶生长
引用本文:龙文元,蔡启舟,魏伯康,陈立亮.相场法模拟多元合金过冷熔体中的枝晶生长[J].物理学报,2006,55(3):1341-1345.
作者姓名:龙文元  蔡启舟  魏伯康  陈立亮
作者单位:(1)华中科技大学材料科学与工程学院,武汉 430074; (2)南昌航空工业学院材料科学与工程学院,南昌 330034
基金项目:中国科学院资助项目;江西省材料科学与工程中心资助项目
摘    要:在二元合金相场模型研究的基础上,进行扩展获得了多元合金相场模型.以Al-Si-Mg三元合金为例,采用该相场模型实现了逼真地模拟多元合金凝固过程的等轴枝晶生长,得到了二次或更高次晶臂生长等复杂的枝晶形貌.随着第三组元Mg含量的减少,枝晶的二次枝晶越发达,枝晶中溶质的偏析越严重,枝晶尖端的生长速率和半径越大,与丁二腈-丙酮体系中枝晶尖端生长速率、半径随溶质浓度变化关系的理论计算和实验结果相符合.另外,枝晶初生晶臂中心的溶质浓度最低,在被二次晶臂包围的界面区域的溶质浓度最高;固液界面区域具有较大的浓度梯度,其中枝晶尖端前沿的梯度最大. 关键词: 相场法 多元合金 凝固过程 枝晶生长

关 键 词:相场法  多元合金  凝固过程  枝晶生长
收稿时间:03 15 2005 12:00AM
修稿时间:2005-03-152005-07-18

Simulation of dendritic growth of multicomponent alloys using phase-field method
Long Wen-Yuan,Cai Qi-Zhou,Wei Bo-Kang,Chen Li-Liang.Simulation of dendritic growth of multicomponent alloys using phase-field method[J].Acta Physica Sinica,2006,55(3):1341-1345.
Authors:Long Wen-Yuan  Cai Qi-Zhou  Wei Bo-Kang  Chen Li-Liang
Institution:1. College of Material Science and Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330034, China ; 2 . College of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract:A phase-field model for multicomponent alloys based on the binary phase-field model has been developed. The isothermal dendritic growth of Al-Si-Mg alloys is presented as a numerical example, accordingly, the dendrite growing morphology of multicomponent alloys solidification could be simulated realistically using the phase-field model. As the result, the intricate figures such as secondary and tertiary dendrite arms are revealed. The decrease of solute Mg can trigger the growth of the secondary arms and increase the solute microsegregation rate, the tip speed and radius of dendrite. The variation of the speed and the radius in the dendrite tip agrees well with theoretical and experimental results in succinonitrile-acetone system. In addition, the spines of the primary arms have lowest concentration, and the mushy regions between the dendrite secondary arms have the highest concentration; the solute gradients are higher in the vicinity of the S/L interface regions, and highest in the tip.
Keywords:phase-field method  multicomponent alloys  solidification  dendritic growth
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