摘要
利用相场法对纯金属熔体中的枝晶生长进行了模拟;研究了界面动力学系数取值的影响因素及其取值对枝晶尖端生长速度和尖端半径的影响。结果表明:界面动力学系数的取值由相场和温度场的耦合系数、热扩散系数、界面厚度、界面原子运动时间变量等参数综合决定,随着界面动力学系数的增加,枝晶尖端生长速度减小,尖端半径增大。
The dendrite growth of pure metal was simulated by phase field model （PFM）. The effects of interface kinetic coefficient on the dendrite tip velocity and dendrite tip radius, and the influence factors which relate the value of interface kinetic coefficient were studied. The results show that the value of interface kinetic coefficient is determined synthetically by the coupling coefficient between the temperature field and the phase field, the thermal diffusivity coefficient, the interface width, the time parameter of interface atomic motion etc. The dendrite tip radius increases, the dendrite tip velocity decreases with the increase of interface kinetic coefficient.
出处
《热加工工艺》
CSCD
北大核心
2008年第20期46-49,共4页
Hot Working Technology
关键词
相场模型
界面动力学
枝晶
phase field model
interface kinetic
dendrite
