CA法模拟各向异性和Gibbs-Thomson参数对枝晶生长的影响  

Effect of Anisotropy Coefficient and Gibbs-Thomson Coefficient on Dendrite Growth

作　　者：张俊婷[1] 崔小朝[1] 王宥宏[1] 

机构地区：[1]太原科技大学应用科学学院,山西太原030024

出　　处：《中北大学学报（自然科学版）》2013年第2期204-207,212,共5页Journal of North University of China(Natural Science Edition)

基　　金：太原科技大学青年基金资助项目(20113021)

摘　　要：基于溶质扩散和界面能的作用,考虑成分过冷、曲率过冷、界面能各向异性和界面扰动等因素,建立了单个枝晶的生长模型.应用该模型将有限体积法与元胞自动机相结合,对Al-4%wtCu合金的枝晶生长过程进行了计算机模拟研究.结果发现:界面能各向异性和Gibbs-Thomson参数对枝晶的形貌和生长速度有着重要影响,随着Gibbs-Thomson系数和各向异性强度的减小,枝晶臂沿优先生长方向出现分裂,且生长速度也随之减小.Based on the physical effect of solute diffusion and interfacial energy,a model for describing the growth of single equiaxed dendrite was established,including the factors of constitutional undercooling,curvature undercooling,anisotropy of interfacial energy and perturbation on the interface.Using this modeling approach combining the finite volume method and the cellular automata technique,the solidification of Al-4%wtCu alloys was simulated.The results show that the impact of anisotropy coefficient and Gibbs-Thomson coefficient for the morphologies of dendrite and the velocity of dendrite growth is important.With the decreasing of anisotropy intensity and Gibbs-Thomson coefficient,the growth velocity of the dendritic tip would be reduced,and the well known branching of finger would been observed.

关 键 词：枝晶生长 元胞自动机 有限体积法 

分 类 号：TG248[金属学及工艺—铸造]