六重对称合金枝晶生长场变量扩散元胞自动机模型

汤思璠, 魏晶晶, 岳怡心, 李鹏宇, 姚曼, 王旭东

Field-Variable Diffusion Cellular Automaton Model for Dendritic Growth with Sixfold Symmetry Alloys

TANG Sifan, WEI Jingjing, YUE Yixin, LI Pengyu, YAO Man, WANG Xudong

表1 计算采用的Mg-6%Al合金热物性参数[13]

Table 1 Thermophysical properties of Mg-6%Al alloy used in the calculations[13]

Parameter Value Unit Diffusivity of alloy elements in liquid DL 1.8 × 10-9 m2·s-1 Diffusivity of alloy elements in solid DS 1.0 × 10-13 m2·s-1 Liquidus temperature TL 901 K Partition coefficient k 0.4 - Liquidus slope mL -5.5 K·%-1 (% for mass fraction) Gibbs-Thomson coefficient Γ 2.0 × 10-7 K·m Kinetic anisotropy δk 0.5 - Thermodynamic anisotropy δ 0.03 - Accommodation coefficient γ 1.25 - Degree of anisotropy n 6 -