Abstract
Effects of elastic field interactions between precipitating droplets on coarsening behavior (Ostwald ripening) have been studied by simulating the droplet growth equations with elastic interactions which have been recently put forward by the present authors. Attractive elastic inter-droplet interactions lead to suppression of coarsening with sharp droplet size distributions, whereas repulsive interactions accelerate coarsening with broadened droplet size distributions. For a small droplet volume fraction, Q = 0.01, the simulation results are in good agreement with our earlier theoretical predictions. The finite Q-effects on coarsening are also investigated for Q = 0.1, and are found to delay the onset time after which elastic interactions play important roles in coarsening, by comparing the simulation result with our earlier theoretical prediction for the same Q value. This is explained by correlation effects. The broadened droplet size distribution is found to be in good agreement with experimental results for fatigued Al-Zn alloys.
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