Abstract
Numerical simulations of the solidification of a binary metal alloy with a globulitic morphology are reported. The model is based on a previously developed two-phase approach that incorporates descriptions of the heat transfer, solute redistribution, melt convection, and solid transport on the system scale with microscopic models of nucleation, thermal and solutal undercoolings, grain growth and impingement. Results are obtained for solidification of an Al-4%Cu alloy in a rectangular cavity cooled from one side. Three simulations are conducted to investigate the effects of solid transport and nucleation rate on the final macrosegregation pattern and grain size distribution. It is shown that the nucleation rate has a profound influence on the settling behavior of the grains, which in turn leads to strong vertical variations in the composition and grain size.
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