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Unformatted text preview: T ( x ), ahead of the interface is linear, constitutional supercooling will occur when dT L ( x )/ dx > dT ( x )/ dx . It is likely that this will occur since dT L ( x )/ dx depends on the concentration gradient, which can be quite high (diffusion flux is limited), while dT L ( x )/ dx depends on the temperature gradient, which is normally limited (since metals are thermally conductive). Prob 3. Many people thought about a twin plane parallel to the film surface. While just fine in principle (and also awarded full credit), there are no shear stresses on this plane, so deformation twins like this will never form. The solutions show the twins that are seen....
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- Fall '11