Abstract
The torsional stress pulse method of Vreeland was used to measure the velocities of 30°-dislocations in various dilute Cu-Al alloy single crystals at 300 K and 77 K. The velocity-stress relation was found to be well described by the theory of Labusch et al. considering also its dependence on solute concentration and temperature. The fraction of dislocations that moved during a pulse increased strongly at the respective CRSS. At finite temperatures this is explained by dislocations released by thermal activation from positions in front of extended solute clusters. This process and that of dislocation multiplication characterize macroscopic deformation in addition to the microscopic process investigated in this paper.
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