摘要
采用相场模型和有限差分法,模拟了过冷金属熔体的枝晶生长,系统研究相场模型中相场和温度场耦合系数(λ)、热扩散系数(DT)以及界面原子运动时间参数( T0)对枝晶形貌的影响。模拟结果表明,随着相场和温度场耦合系数的增大,晶粒形貌由紧实枝晶向海藻态转变;随着热扩散系数和界面原子运动时间参数的增大,晶粒形貌由光滑枝晶向紧实枝晶转变。
The dendrite growth of pure metal in undercooled melts was simulated by using phase field model （PFM） and finite difference schemes. The connection between the dendrite morphologies and some parameters in phase-field model were studied, which include the coupling coefficient of the temperature field（λ） and the phase field, the thermal diffusivity （DT）, the time parameter of interface atomic motion （T0） and so on. The results show that, with the increase of coupling coefficient of the temperature field and the phase field, the grain morphologies transformed from compact dendrite to seaweed morphologies; with the increase of thermal diffusivity and the time parameter of interface atomic motion, the dendrite morphologies transform to compact morphologies from slim dendrite.
出处
《热加工工艺》
CSCD
北大核心
2007年第22期40-43,47,共5页
Hot Working Technology
关键词
相场模型
枝晶
微观组织
phase field model
dendrite
microstructure
