| Numéro |
J. Phys. Colloques
Volume 46, Numéro C10, Décembre 1985
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
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|---|---|---|
| Page(s) | C10-297 - C10-300 | |
| DOI | https://doi.org/10.1051/jphyscol:19851066 | |
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 46 (1985) C10-297-C10-300
DOI: 10.1051/jphyscol:19851066
Physics Department, University College of Bahrain, PO Box 1082, Bahrain, Arabian Gulf.
J. Phys. Colloques 46 (1985) C10-297-C10-300
DOI: 10.1051/jphyscol:19851066
DISLOCATION RELAXATION IN HIGH PURITY POLYCRYSTALLINE ALUMINUM AT MEGAHERTZ FREQUENCIES
M. ZEINPhysics Department, University College of Bahrain, PO Box 1082, Bahrain, Arabian Gulf.
Abstract
The internal friction of cold-worked polycrystalline aluminum has been measured in the temperature range of l00K to 290K, at frequencies of 10 and 5MHZ, using a conventional ultrasonic pulse technique with a single transducer. Temperature, height and shape of the internal friction peak were studied as a function of the magnitude of stress used in the prior deformation. The results show a large decrease in the peak temperature as the deformation is increased followed by as light increase as the deformation is continued. An increase in the height of the peak, and decrease in the activation energy has been observed by increasing the deformation.