INVESTIGATION OF THE ULTRASONIC ATTENUATION IN IRRADIATED METALS.
Final rept. 15 Jan 64-15 Nov 66,
TUFTS UNIV MEDFORD MASS DEPT OF PHYSICS
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Measurements of the ultrasonic attenuation of phonons in samples of pure copper and aluminum were undertaken to determine the effects of gamma irradiation on the electron-phonon interaction and the phonon-dislocation interaction in normal metals. From these measurements the absolute electronic attenuation was determined, as well as the temperature dependence of the electron mean free path at low temperatures. The measurements revealed that the ultrasonic attenuation in copper is orientation-dependent, and that the attenuation in aluminum is orientation-independent. The electron-phonon interaction in copper is orientation-dependent the electron-phonon attenuation in aluminum is orientation-independent. The dislocation-phonon interaction in copper is also orientation-dependent, whereas in aluminum no dislocation-phonon interaction was detected. Author
- Metallurgy and Metallography
- Radioactivity, Radioactive Wastes and Fission Products