| Issue |
J. Phys. Colloques
Volume 42, Number C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-103 - C5-107 | |
| DOI | https://doi.org/10.1051/jphyscol:1981515 | |
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-103-C5-107
DOI: 10.1051/jphyscol:1981515
1 Centre d'Etudes Nucléaires de Grenoble, Département de Recherche Fondamentale Section de Physique du Solide, 85 X - 38041 Grenoble Cedex, France
2 Akademia Górniczo - Hutnicza, Instytut Metalurgii, Al. Mickiewicza 30, 30-059 Kraków, Poland
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-103-C5-107
DOI: 10.1051/jphyscol:1981515
AMPLITUDE DEPENDENCE OF INTERNAL FRICTION IN IRON AT LOW TEMPERATURE
J.F. Dufresne1, L.B. Magalas1, 2 et P. Moser11 Centre d'Etudes Nucléaires de Grenoble, Département de Recherche Fondamentale Section de Physique du Solide, 85 X - 38041 Grenoble Cedex, France
2 Akademia Górniczo - Hutnicza, Instytut Metalurgii, Al. Mickiewicza 30, 30-059 Kraków, Poland
Abstract
A narrow investigation of the amplitude dependence on internal friction in high purity iron was conducted. It was found that the activation energy of βα peak is E = 0.28 eV. The possibility that the β1 peak is thermally activated unpinning on string-like dislocations can be ruled out. It is therefore accounted for in terms of thermally activated unpinning phenomenon of geometrical kinks on non-screw dislocations. A big amplitude effect at 4.2 K was also observed.