Phase transformations in the solid state usually occur by a process of nucleation and growth. The theories for these processes are well established. Overall transformation kinetics deals with the evolution of volume fraction of product phase as a function of time, temperature and other variables. It relies on a most elegant theory, the Avrami theory, to deal with impingment of particles which originated from different locations.

This should be most useful to those interested in phase transformations.

The lecture was given by Professor H. K. D. H. Bhadeshia, University of Cambridge.

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