| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-345 - C5-350 | |
| DOI | https://doi.org/10.1051/jphyscol:1981551 | |
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-345-C5-350
DOI: 10.1051/jphyscol:1981551
DYNAMIC DISLOCATION DAMPING IN METALS
V.I. Al'Shits1, N.P. Kobelev2 et Ya. M. Soifer21 Institute of Crystallography, Academy of Sciences of the USSR, Moscow, USSR
2 Institute of Solid State Physics, Academy of Sciences of the USSR, Chernogolovka, Moscow district, USSR
Abstract
The simultaneous measurements of the amplitude independent damping and modulus defect in the copper and lead single crystals are performed within the temperature range from 4,2 K to 300 K (Cu) and from 4,2 K to 10 K (Pb) at 5+15 MHz. It is found that the dislocation internal friction in copper is determined by the superposition of two energy loss contributions : dynamic loss caused by the viscous dislocation drag and the relaxation one caused by thermoactivated dislocation motion. The dynamic loss contribution was singled out, and the temperature dependence of the damping constant B is obtained. The B(T) de endence in Cu is discussed in terms of the existing models of the dynamic dislocation damping. By using the superconducting transition in lead the strong evidence is obtained that the damping constant B at low temperatures is determined by the electron-dislocation interaction.