在纯物质相场模型中, 采用计算效率较高的邻界面点相场大梯度计算域控制法,模拟了纯金属在无量纲过冷度为0.55熔体中等轴枝晶的生长演化过程, 得到与实验观察相符合的等轴枝晶生长规律, 通过加入形式较简单的热扰动, 产生了明显的二次枝晶臂, 有的二次枝晶臂上还出现了三次枝晶臂. 同时计算了枝晶晶轴尖端的无量纲生长速度和曲率半径,并求出Peclet数. 计算结果与微观可求解理论和Ivantsov理论吻合良好.
A new way to improve computational efficiency of phase field is used to simulate the evolution of the equiaxed dendritic growth morphology in pure metal melt with initial dimensionless supercooling of 0.55. Much information about equiaxed dendritic growth has been got, which is in good agreement with experimental observation. The births of second arms and third arms have been simulated successfully by adding appropriate thermal noise. Furthermore, the dimensionless velocity and radius of the equiaxed dendritic axis' tip, and the Peclet number are computed, and the computational results by phase--field method are in good agreement with the ones by the microsolvability theory and the Ivantsov theory.
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