Abstract
Ultrasonic attenuation and velocity measurements were made as a function of polarization, temperature, frequency, and annealing before and after 2.5-MeV electron irradiation of dilute AlFe alloys. In addition to the relaxation peaks observed in earlier low-frequency internal-friction measurements, two new relaxation peaks were found. One of these has all the properties predicted by a size-effect model. The peak structure observed is very different from that found for AlMn, suggesting that theories based only on impurity size require extension. 20 references, 12 figures, 3 tables.
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