Abstract
The Ostwald ripening behavior of Al 8 CeCu 4 phase in the Al-14Cu-7Ce alloy annealed at elevated temperatures was investigated using hardness testing, scanning electron microscopy, image analyses and physical modeling. Results indicate that the average radius of Al 8 CeCu 4 particles increases while the hardness of the alloy decreases with increasing of annealing temperature and time. The ripening process of Al 8 CeCu 4 phase is mainly controlled by the volume diffusion of Ce. The ripening kinetic of Al 8 CeCu 4 particles satisfies well the modified Lifshits-Slyozov-Wagner theory, taking into account the effect of the volume fraction of Al 8 CeCu 4 particles. The volume diffusion coefficient of Ce and the interfacial energy between the matrix and Al 8 CeCu 4 phase were also calculated based on the general rate equation.
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