| 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) | C10-343 - C10-346 | |
| DOI | https://doi.org/10.1051/jphyscol:19851076 | |
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 46 (1985) C10-343-C10-346
DOI: 10.1051/jphyscol:19851076
Laboratoire de Mécanique et Physique des Matériaux, UA CNRS 863, ENSMA 86034 Poitiers Cedex, France
J. Phys. Colloques 46 (1985) C10-343-C10-346
DOI: 10.1051/jphyscol:19851076
ON THE 0.4 TM PEAK IN F.C.C. PURE METALS
A. RIVIÈRE, J. WOIRGARD and J. DE FOUQUETLaboratoire de Mécanique et Physique des Matériaux, UA CNRS 863, ENSMA 86034 Poitiers Cedex, France
Abstract
An internal friction relaxation peak-located about 0.4 TM for a vibration frequency of 1 Hz is observed in poly and single crystals of pure F.C.C. metals (Al-Ag-Cu-Ni-Pd). The relating activation energy is always close to 0.5 Hv, Hv being the self diffusion energy. According the experimental results, the peak can be associated with motion of dislocation loops belonging either to fragments of cells destroyed in heavily cold-rolled polycrystal, or freshly created dislocations in high temperature annealed poly or single crystals. The observed effects can be explained by a mechanism involving dislocation climb enhanced by vacancy core diffusion.