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Pure aluminum was irradiated at about 90°K using 2-MeV electrons. Isochronal and isothermal annealing studies were carried out. The isochronal anneals were for 10 and 30 min at temperatures 10°C apart. The isothermals were for 64 min at temperatures 20°C apart. The major results were: Stage III occurs by a second-order process with activation energy Em = 0.62±0.04 eV. From the fact that this activation energy agrees well with that observed after quenching, it is concluded that stage III in aluminum occurs by vacancy migration.

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