Dislocation Mobility in Copper
- 1 August 1967
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 38 (9), 3595-3603
- https://doi.org/10.1063/1.1710178
Abstract
The velocity of dislocations of mixed edge‐screw type in copper crystals of 99.999% purity has been measured as a function of stress at room temperature. Dislocation displacements produced by torsion stress pulses of microsecond duration were detected by etch pitting {100} surfaces. A nearly linear relationship between dislocation velocity and resolved shear stress was found. Stresses from 2.8×106 to 23.1×106 dyn/cm2 produced velocities from 160 to 710 cm/sec. These data give a value of the damping constant for high‐velocity dislocations of 7×10−4 dyn·sec/cm2, in good agreement with the values deduced from internalfriction measurements. The results also agree, within experimental and theoretical uncertainties, with the phonon viscosity model for the mobility of dislocations.Keywords
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