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Lecture 10: Homogeneous Nucleation

1 Lecture 10: Homogeneous Nucleation Today s topics What is Nucleation ? What implied in real practice of materials processing, particularly phase transformation? General comparison between Homogeneous and heterogeneous Nucleation . Critical particle (or nucleus) size (r*) for a Homogeneous Nucleation from liquid ( , solidification of metals). How to derive and understand the critical size in terms of both thermodynamics and kinetics of Nucleation . About Nucleation Nucleation : localized formation of a distinct thermodynamic phase.

temperature), but which are above the homogeneous nucleation temperature (pure substance freezing temperature) are called supercooled. • An example of supercooling: Pure water freezes at −42°C rather than at its freezing temperature of 0°C. So, if cooled slowly below the freezing point, pure water may remain

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