Abstract
A kinetic theory of nucleation and growth of single atom phase precipitates in a supersaturated solid solution at grain boundaries is developed. In the present theory, particular attention is devoted to the analysis of two stages of the overall transformation process: (1) – a stage of quasi-steady-state nucleation and (2) – a transient stage of coarsening. As a result of this analysis, the quasi-steady-state nucleation rate, the number of new phase particles formed via nucleation and diffusional growth, and the time-evolution of the size distribution of the precipitates are established. Moreover, estimates are given for the duration of the different stages of the decomposition process.
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