An ultrasonic study of impurity-interstitial complexes in electron irradiated Al-Si and Al-Ag
Ultrasonic attenuation and velocity measurements were performed to probe the structure and annealing behavior of solute self interstitial complexes in electron irradiated (T < 70 K) dilute Al-Ag and Al-Si alloys. In both alloy systems, a similar attenuation peak structure is observed. This peak structure strongly suggests that in both alloys, a defect species of <110>- monoclinic defect symmetry is present. The annealing, during Stage II, of this defect species follows a first order rate -equation which has a prefactor proportional to the solute concentration. The diaelastic effect associated with this defect is found to be comparable in magnitude and anisotropy to that attributed to <100>-self interstitial dumbbells in pure aluminum. A <110>-monoclinic mixed dumbbell model is examined as a possible explanation for these results.
ultrasonic attenuation, intersitial complexes, electron irradiated, Aluminum Alloys
University of Illinois - Urbana-Champaign
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