Recovery of Electron-Irradiated Aluminum and Aluminum Alloys. II. Stage II

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Abstract
The recovery of the residual electrical resistivities of pure Al and the Al (nominally 0.1 at.%) alloys Al-Mg, Al-Ga, and Al-Ag has been investigated following 1-MeV electron irradiation near 4°K. The addition of solute atoms caused a suppression of recovery normally observed in stage I (<70°K) for pure Al. This suppression amounted to 20-27% of the recovery of the pure sample. The state-II (70-170°K) recovery of pure Al occurs throughout the whole temperature range. However, well-defined recovery regions were observed between 70 and 90°K and between 120 and 140°K. In the alloy system, the recovery characteristics varied with the particular solute addition. Specifically, Al-Mg showed two distinct substages of recovery in stage II, centered at 81 and 127°K. Al-Ga showed a doublet (two partially overlapping substages) centered at about 111°K. Al-Ag showed no distinct substages of recovery which could be attributed to the addition of the solute. None of the substage kinetics follow integral reaction orders when analyzed with chemical rate theory, indicating complex annealing processes.