枝晶生长的相场法数值模拟  

Numerical Simulation of Dendritic Growth Using Phase-Field Method

作　　者：刘晶峰[1] 赵紫玉[1] 蹇崇军[1] 江开勇[1] 

机构地区：[1]华侨大学机电与自动化学院,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2010年第1期6-11,共6页Journal of Huaqiao University(Natural Science)

基　　金：福建省科技计划重点项目(2008H0028);华侨大学高层次人才科研启动项目(07BS202)

摘　　要：利用一个简单的相场模型,对过冷熔体中枝晶的生长形貌进行数值模拟,定性分析各向异性强度、无量纲潜热及扰动因子等对枝晶形貌的影响.结果表明,枝晶主干生长速度随着各向异性强度的增大而增大,并且枝晶结构强烈依赖于各向异性强度;随着无量纲潜热的增大,晶体生长过程中枝晶结构特征愈加明显;扰动对枝晶结构特征有一定的影响,随着扰动因子的增加,枝晶间竞争生长加剧.By a simple phase-field model, a series of numerical simulations for dendritic growth into undercooled melt is performed to show the formation of various dendritic patterns. Qualitative analysis of the influence of the strength of ani- sotropy, dimensionless latent heat, and noise factor on the shape of crystal growth is given. The results show that the ve- locity of principal branch growth increases as strength of anisotropy increases and the branch structure is very strongly dependent on strength of anisotropy; as dimensionless latent heat increases, dendritic structures become obvious during grain growth; competition of branches growth becomes strong as noise factor increases.

关 键 词：枝晶生长 相场法 过冷熔体 数值模拟 形貌 

分 类 号：TG111.4[金属学及工艺—物理冶金]