Phase-field modeling of dendritic growth of magnesium alloys with a parallel-adaptive mesh refinement algorithm  

作　　者：Bing-hui Tian Meng-wu Wu Ang Zhang Zhi-peng Guo Shou-mei Xiong 

机构地区：[1]Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,China [2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China [3]School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《China Foundry》2021年第6期541-549,共9页中国铸造（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51805389);the Natural Science Foundation of Hubei Province,China(No.2018CFB210);the 111 Project(No.B17034)。

摘　　要：A two-dimensional phase field(PF)model was developed to simulate the dendritic solidification in magnesium alloy with hcp crystal structure.By applying a parallel-adaptive mesh refinement(Para-AMR)algorithm,the computational efficiency of the numerical model was greatly improved.Based on the PF model,a series of simulation cases were conducted and the results showed that the anisotropy coefficient and coupling coefficient had a great influence on the dendritic morphology of magnesium alloy.The dendritic growth kinetics was determined by the undercooling and equilibrium solute partition coefficient.A significant finding is acquired that with a large undercooling,the maximum solute concentration is located on both sides of the dendrite tip in the liquid,whereas the maximum solute concentration gradient is located right ahead of the dendrite tip in the liquid.The dendrite tip growth velocity decreases with the increase of the equilibrium solute partition coefficient,while the variation trend of the dendrite tip radius is the opposite.Quantitative analysis was carried out relating to the dendritic morphology and growth kinetics,and the simulated results are consistent with the theoretical models proposed in the previously published works.

关 键 词：magnesium alloy dendritic growth phase-field modeling SOLIDIFICATION 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] TG146.22[自动化与计算机技术—计算机科学与技术]