Nucleation and Growth Johnson-Mehl-Avrami Equation

1 Nucleation and Growth Johnson-Mehl-Avrami Equation 

The Physical Chemistry of Materials Energy and Environmental Applications 

FIGURE 3.1 Nucleation and growth process in the case of solidification. 

The induction process is normally dominated by the nucleation process. The acceleration step tends to be dominated by growth, while the deceleration is a consequence of the extinction of growth, because of the impingement of diverse growth regions at grain boundaries [5], 

The kinetic theory presented by Johnson and Mehl [2] and Avrami [3] predicts the volume fraction transformed, as a function of time, t, during an isothermal phase transformation. The derivation of the Johnson-Mehl-Avrami kinetics is based on the grouping of the three individual partial processes, that is, nucleation, growth, and impingement of growing particles [5], 

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