各向异性强度对过冷NiCu合金枝晶生长的影响研究

Influence of Anisotropy Degree on Dendrite Growth in Ni-Cu Binary Alloy Using the Phase Method

采用相场与浓度场耦合的相场法,对二元单相Ni-Cu合金过冷熔体中的枝晶生长过程,进行了二维数值模拟,研究了各向异性强度对枝晶生长的影响。结果表明,随着各向异性强度的增大,枝晶尖端生长速度加快,枝晶结构特征愈加明显。各向异性最佳取值范围0.03～0.055之间,能真实反映实际的技晶生长形貌。

Tha phase-field model which coupled the concentration field and phase field is applied to simulate microstructure evolution during dendritic growth of Ni-Cu binary in 2-D, The influence of anisotropy degree on dendritic crystal growth is investigated in this paper. The simulated result shows that as the degree of anisotropy increases, the growth velocity of dendrite tip is accelerated and characteristic of dendritic structure is more obvious. When the anisotropy parameter is between 0.03 and 0. 055, the best simulation result of the dendrite morphology can be obtain.