Abstract
A microsegregation model is used to investigate the effect of approximating liquidus and solidus lines in binary phase diagrams by straight lines during solidification modeling. Even if repartitioning of solute can be described by a constant partition coefficient, the curvature of the phase boundary lines exerts an influence on results of microsegregation calculations. Deviations of liquids and solidus lines from linearity have a distinct influence on microstructural parameters predicted for a wide range of cooling conditions, owing to the effect of pronounced changes of the solidified fraction at a given temperature. Results obtained with simplified phase diagrams should therefore be considered with care.
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