Stage III Annealing Study of Electron-Irradiated Pure Aluminum

Abstract

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.

On the point-defect annealing mechanism for stage III recovery in irradiated or quenched tungsten

“…We emphasize, Qnce again, that the temperature range of Stage III in quenched w is often different from that of irradiated W because of the larger number of jumps made by a vacancy before it is annihilated in quenched W; (23,27,(36)(37)(38)(39)) also see Fig. 12 in reference (22) and Fig.…”