Abstract
The non-dimensional analysis of segregation during directional solidification under transient conditions is applied to different types of growth in various solidification configurations, namely Bridgman, Czochralski and floating zone. We shall see that in most experiments, both segregation mechanisms (the formation of a steady-state diffusion barrier and enrichment of the liquid through homogenization) are concurrent. Consequently typical theories which consider only the two extremes are not suitable to interpret this phenomenon. These theories are compared and attention is drawn to their limitations. The marked influence of the \\ ̃ gD parameter on segregation is pointed out. It may have a value below 5 even during experiments at microgravity. giving rise to a segregation very different from the pure diffusion profile. The effect of the second parameter of the model, ø, is used to investigate the influence on the segregation proceess of variations in the composition of the liquid ahead of the diffusion layer. Finally our model permits a quantitative interpretation of several solidification experiments aimed at determining the influence of convection on segregation.
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