定向凝固糊状区枝晶粗化和二次臂迁移的实验和模拟

方辉,薛桦,汤倩玉,张庆宇,潘诗琰,朱鸣芳

Dendrite Coarsening and Secondary Arm Migration in the Mushy Zone During Directional Solidification:

Hui FANG,Hua XUE,Qianyu TANG,Qingyu ZHANG,Shiyan PAN,Mingfang ZHU

表1 本工作采用的物性参数[23,34]

Table 1 The physical parameters used in the present work[23,34]

Parameter Unit Value Gibbs-Thomson coefficient, Γ ℃·m 6.48×10-8 Diffusion coefficient in liquid, Dl m2·s-1 1×10-9 Diffusion coefficient in solid, Ds m2·s-1 1×10-12 Partition coefficient, k - 0.1 Liquidus slope, ml ℃·%-1 (mass fraction) -2.8 Melting point of the pure solvent, Tm ℃ 58.081