Abstract
Recent studies using classical precipitation models to follow experimental precipitation kinetics in Al-Sc alloys have concluded that an explicitly time- and temperature-dependant interfacial energy must be adopted to explain the observed precipitation kinetics. An alternative explanation for the precipitation kinetics based on vacancy-enhanced diffusivity is proposed in this work. This method, combined with a classical Kampmann–Wagner (KWN) class model, has allowed us to reconcile the kinetics of nucleation, growth, and coarsening in an Al-Mg-Sc alloy using a single value for the interfacial energy in the temperature range 250 °C to 350 °C.
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