SIMULATION OF MULTI-COMPONENT SOLIDIFICATION USING THE CELLULAR AUTOMATON-FINITE DIFFERENCE (CAFD) METHOD

摘要

A novel numerical model is described which simulates two-dimensional columnar and equiaxed dendritic growth of ternary alloys with the aid of a combined cellular automaton-finite difference approach. The key components of the model are FD modelling of solute diffusion in both the solid and liquid, a CA model of dendrite growth, solute rejection and absorption at the solid/liquid interface and finally a combined curvature/surface energy anisotropy algorithm. As a demonstration, the model is applied to the Al-Cu-Si ternary alloy system and preliminary results are shown for the first time. The effects of alloy composition and solidification conditions on microsegregation are considered.