Influence of Anisotropy on Dendritic Growth in Binary Alloy with Phase-Field Simulation

Some computational results on dendritic growth in binary alloy are obtained by using a phase-field model coupled the solute gradient term. The effect of crystalline anisotropy on the morphological formation, tip steady state and the solute partition is investigated for different dendrites. The interface formation and tip steady state are affected evidently with increase in anisotropy for < 100 > dendrite growth, but the solute partition coefficient is not significantly influenced. For < 110 > preferred growth directions, when the anisotropy strength is lower than the critical value, the tip velocity of [(1) over bar 10] direction is lower than [(1) over bar 01] and [0 (1) over bar1] directions. As the anisotropy strength crosses the critical value, the tip velocity of [(1) over bar 10] direction increases; suddenly, larger than the tip velocity of [<(1over bar>01] and [0 (1) over bar1] directions, showing strong solute trapping.