Dislocation Motion At Low Temperatures
Abstract
Dislocations in metals are underdamped at low temperatures, where their motion is a function of viscous processes. This viscosity can be altered by changing the energy spectrum of the electrons or by a size effect. Alterations of the energy spectrum of the electrons allows the instantaneous dislocation velocities to be measured. This involves rotation of a magnetic field relative to the Burgers vector of the moving dislocations, resulting in extrema in the stress. Measurments of these extrema provide information on the instantaneous dislocation velocity, V_i, the drag coefficient, B, and how many dislocations are moving at V_i. Results of experiments in Cd and Zn will be presented.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.G2606G