Abstract
The equilibrium state of moving dislocations in a crystal during the constant strain-rate deformation is discussed on the basis of three hypothesis. I. The configuration of immobile dislocations is such that the static free energy of the crystal associated with existing immobile dislocations be as low as possible. II. There are certain equilibrium stationary values in the density and the velocity of moving dislocations which depend on the rate-controlling mechanism of dislocation motion and on the deformation condition. III. The equilibrium state of moving dislocations is determined so as to make the component of the flow stress associated with moving dislocations minimum to maintain the given strain rate. This model is shown to give a good description of the strain-rate dependence of the deformation behavior in germanium crystals at 600°C observed experimentally.
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