Interstitial trapping during stage I E recovery of electron-irradiated pure aluminum and its dilute alloys with Ag and Mg

Recent experimental data on the influence of additional vacancies and Frenkel pairs upon the stage IE recovery of electron-irradiated Al and Al-15 ppm Ag and newly obtained results on the dilute alloy system Al- (5–65) ppm Mg are analyzed in terms of the chemical reaction rate theory. The corresponding rate equations are solved numerically yielding the following quantitative results: the capture radius of a vacancy for an Al self-interstitial, rAlv=2.1a0; the capture radii of an Mg and of an Ag atom, respectively, rMg=0.33rv, rAg=0.6rv; the electrical resistivity of a unit concentration of vacancies, ρv=2.0×10−4 Ω cm/unit concentration. The best fit has been obtained with a value of Em=112 meV for the migration energy of la self-interstitial and a frequency factor of 3×1014 sec−1.