| 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) | C10-367 - C10-370 | |
| DOI | https://doi.org/10.1051/jphyscol:19851082 | |
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 46 (1985) C10-367-C10-370
DOI: 10.1051/jphyscol:19851082
1 Laboratoire de Mécanique et Physique des Matériaux, UA CNRS n° 863, ENSMA, 86034 Poitiers Cedex, France
2 Laboratoire de Métallurgie physique, UA CNRS n° 131, Faculté des Sciences, 86022 Poitiers, France
J. Phys. Colloques 46 (1985) C10-367-C10-370
DOI: 10.1051/jphyscol:19851082
HIGH TEMPERATURE RELAXATION MECHANISMS IN Cu-Al SOLID SOLUTIONS
S. BELHAS1, A. RIVIERE1, J. WOIRGARD1, J. VERGNOL2 and J. DE FOUQUET11 Laboratoire de Mécanique et Physique des Matériaux, UA CNRS n° 863, ENSMA, 86034 Poitiers Cedex, France
2 Laboratoire de Métallurgie physique, UA CNRS n° 131, Faculté des Sciences, 86022 Poitiers, France
Abstract
The high temperature damping of copper-aluminium solid solutions has been investigated in single crystals containing various aluminium contents : 3.1 - 5.4 - 7.3 - 9.3 and 11 .4 at % of Al. Measurements have been performed in a wide frequency range (10-4 Hz - 10 Hz) between room temperature and 1200 K. Two internal friction peaks have been observed in slightly strained specimens. Both the relaxation strength and the activation energy have been found to be sensitive with the aluminium content. The results can be explained with a mechanism involving dislocation climb and independent gliding of Shockley partials, in widely split dislocations.