Abstract
The isochronal recovery of work hardening in Al-Al 2O 3 SAP type alloys has been studied by combining several techniques, mainly electrical resistivity and metallographic observations. The effects of the oxide content on the amount of defects produced by cold work and on the way they anneal out have been observed. The influence of impurities has also been considered. It is noticed that work-hardening gives rise to a high lattice strain increasing with oxide content and depending on particle spacing too. Annealing takes place in stages. The last corresponds to recrystallization and is preceded by a recovery process giving rise to polygonization and growth of the grains. This is characterized by the presence of substages: three peaks are observed in less pure alloys, a single peak, centered at ≈ 200° C, in the samples prepared from pure aluminium. This substage seems connected with annealing of vacancies. For a given degree of work-hardening, recrystallization takes place at temperatures rapidly rising with the oxide content. Probably this behaviour results from competition between recovery and recrystallization increasing with the dispersed phase.
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