6.1 | MSE104 - Scheil Equation

Lecture 6 - Faster Solidification and the Scheil Equation. Constitutional microsegregation.
Course webpage with notes: dyedavid.com/ms...
Lecturer: Dr David Dye.
Licence: Creative Commons
Department of Materials, Imperial College, London, UK

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[@ashwinkumar7977]

Hello Professor,
I didn't quite understand the term infinite mixing and one more question, when the liquid solidifies, obviously solid is slowly formed but why does the liquid gets enriched while forming solids at the same time? Please reply.

[@jameslennard4062]

Not sure on infinite mixing but intimate mixing would imply that all of the dissolved atoms are uniformly/homogeneously dispersed...
The liquid is enriched as the purest material is the first to solidify: dissolved (ie alloy) atoms are rejected from the solid phase and end up in the liquid, the final liquid to solidify is therefore the most impure (or solute-enriched, depends on perspective)... this can be seen at home when you freeze an ice lolly: any remaining liquid or recently-melted ice lolly tastes sweeter than the frozen parts which are more like pure ice.