What is constitutional undercooling?

[ScareCrow271828]

Homework Statement

What is constitutional undercooling? What are it's effects?

Homework Equations

The Attempt at a Solution

Undercooling is when the liquid has a below freezing temperature. However konstituntial undercooling occurs during solidification when the liquid is brought to freezing ahead of the solid-liquid interface. Assuming that there are nucleation sites available, would homogenous nucleation occur since temperatures are low enough away from the liquid-solid interface? Are there other effects?

 

[haruspex]

Homework Statement

What is constitutional undercooling?

You could try https://en.m.wikipedia.org/wiki/Supercooling#Constitutional_supercooling, but I do not pretend to understand it myself.