What is Constitutional Undercooling and how does it work?

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What is Constitutional Undercooling and how does it work?

In: Engineering

Someone taking a summer course on solidification?

A key is in the word “constitutional” which in this case references the things that constitute the melt, the different components of the melt. So, the stuff that makes up the melt is what causes it to be undercooled.

When the melt is going from a liquid to a solid, the amounts of the different stuff in the melt that is stable in the liquid and the amount of stuff that is stable in the solid is not usually the same amount. It is a key that the melt is made.put of different stuff and not a single.component, an alloy not a pure metal. Right at that interface between the solid and liquid, the stuff that isn’t stable in the solid gets pushed out into the liquid and that changes the composition, or “constitution” of the melt. This new composition has a far lower melting temperature than the original melt, and is thus “supercooled.”