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Modeling Solid-State Precipitation by Ernst Kozeschnik

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Chapter 3

Diffusion-Controlled Precipitate Growth and Coarsening

The first stage of a phase transformation is controlled by the rate of generation of supercritical nuclei of the new phase. The nucleation of particles is a stochastic process which can be quantitatively described on the basis of statistical thermodynamics and mechanics. The concepts of Classical Nucleation Theory (CNT) have been outlined in the previous chapter with special emphasis on solid-state nucleation. It is important to emphasize that the formulation of nucleation theory is founded on the average behavior of large thermodynamic systems. CNT does not deliver answers to the spatial and temporal occurrence of individual nucleation events, nor can it do so. However, CNT does ...

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