CAJ | 학술논문

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.
이용일개간단적상장모형,대과랭용체중지정적생장형모진행수치모의,정성분석각향이성강도、무량강잠열급우동인자등대지정형모적영향.결과표명,지정주간생장속도수착각향이성강도적증대이증대,병차지정결구강렬의뢰우각향이성강도;수착무량강잠열적증대,정체생장과정중지정결구특정유가명현;우동대지정결구특정유일정적영향,수착우동인자적증가,지정간경쟁생장가극.
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 anisotropy, dimensionless latent heat, and noise factor on the shape of crystal growth is given. The results show that the velocity 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.