Abstract
Formation mechanisms of precipitate free zones (PFZ) in an artificially aged Al–1.74 mol%Cu alloy have been clarified using transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and a Monte Carlo computer simulation. The vacancy depletion mechanism caused by the annihilation of quenched-in excess vacancies was found to work predominantly in the early stage of aging at 433 K, whereas the solute depletion mechanism caused by the grain boundary precipitation followed thereafter. The simulation model taking into account such a vacancy depletion effect well reproduced the obtained experimental results, suggesting that the difference of size distribution of Cu clusters after quenching is responsible for the initial formation of PFZ in the subsequent aging stage.
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