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Nucleation and Growth

Nucleation and GrowthTopic DarwishMECH 636: Solidification Modelling5-4 Heterogeneous Nucleation ! undercooling of a few K sufficientNNheterogeneoushomogeneous> due to reduced nucleus/melt surfaceFig. 5-4. Sketch ofhomogeneous andheterogeneousnucleation. Thelatter occurs atexisting surfaces.""GfGccheterogeneoushomogeneous = ( )()ff=coscos:## wetting angleFig. 5-5. (Left) Nucleation at a wall and wetting angle #. (Right) f defined in eq. ( ) as function ofcos # for a flat substrate. As expected Nucleation is facilitated if the melt wets the solid Nucleation facilitated by:- similar crystal structure (low misfitstrain)- chemical affinity- rough surface (reduced melt/nucleus surface)Grafting of melt with small particles !

Nucleation and Growth Topic 4 M.S Darwish MECH 636: Solidification Modelling 5- 4 H et r o g en o u s n c l e a t i o n! u n d erc ol i n g o fa ew Ks u f i c i en t N N h e t r og n u s > h o m g en u s d u eto r d u c e d n ul s / mel t s u rf a c e F i g .5- 4 S k etc h of h o m g en u s a nd h e t r og n u s n u c l ea ti o . T he l a ter ...

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