During solidification of an alloy solute gets partitioned between liquid and solid. As it cools the composition of liquid and solid keeps changing. While the composition of solid can change only by diffusion that of liquid can change due to both diffusion and convection current (stirring). The laRead more
During solidification of an alloy solute gets partitioned between liquid and solid. As it cools the composition of liquid and solid keeps changing. While the composition of solid can change only by diffusion that of liquid can change due to both diffusion and convection current (stirring). The latter is much faster. If there is no convection or stirring concentration of solute builds up in the boundary layer. Its melting point becomes significantly lower than that of the liquid away from the interface. If the temperature gradient beyond the solid liquid interface is less than a critical value constitutional super cooling occurs. This promotes solidification. If the gradient is more than the critical value the solid liquid interface remains planar.
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During solidification of an alloy solute gets partitioned between liquid and solid. As it cools the composition of liquid and solid keeps changing. While the composition of solid can change only by diffusion that of liquid can change due to both diffusion and convection current (stirring). The laRead more
During solidification of an alloy solute gets partitioned between liquid and solid. As it cools the composition of liquid and solid keeps changing. While the composition of solid can change only by diffusion that of liquid can change due to both diffusion and convection current (stirring). The latter is much faster. If there is no convection or stirring concentration of solute builds up in the boundary layer. Its melting point becomes significantly lower than that of the liquid away from the interface. If the temperature gradient beyond the solid liquid interface is less than a critical value constitutional super cooling occurs. This promotes solidification. If the gradient is more than the critical value the solid liquid interface remains planar.
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