The authors show that the kinetics of the classical two-particle Ostwald ripening problem can be altered radically by elastic stress induced by misfit (coherency) strains. The growth rates of the second-phase particles in the presence of elastic stress differ not only in magnitude but also in sign from the classical zero-stress treatment. For example, the larger particle does not always grow at the expense of the smaller particle, but there are large ranges of the thermophysical parameters in which inverse ripening occurs; i.e., the smaller particle grows at the expense of the larger particle. Elastic stresses also may induce morphological changes in the particles, as well as far stronger spatial correlations between the coarsening particles than in the classical zero-stress limit. The influence of misfit strains on particle growth rates and regimes of inverse coarsening is greater than that predicted from elastic energy analyses. Many of the qualitative features of the ripening behavior discussed could be observed in the multibody problem found in nature.
|Original language||English (US)|
|Number of pages||15|
|Journal||Metallurgical transactions. A, Physical metallurgy and materials science|
|State||Published - Jul 1 1989|
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