Abstract
The coarsening process of second-phase droplet in solidifying Al-20 wt% Bi immiscible alloy is in situ studied using synchrotron radiation imaging technology. The collision-induced coarsening and Ostwald coarsening phenomena are directly observed and analyzed. It is found that through observation, collision-induced coarsening phenomenon occurs between droplets with little difference in radius, while Ostwald coarsening phenomenon occurs among droplets with much difference in radius. Moreover, the coarsening rate of Ostwald coarsening is much higher than that of collision-induced coarsening.
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