Abstract
The velocity of edge oriented dislocations in pure iron single crystals was determined as a function of stress and temperature. The velocities were determined from measurements of the growth of slip bands which had been subjected to constant amplitude stress pulses of known duration. Slip bands were observed using the Berg-Barrett X-ray technique. Measurements were made for temperatures of 77, 198, 295 and 373°K. Resolved shear stresses covered a range of 10–500 Mdyn/cm 2. Measured velocities ranged from 10 −2 to 1 cm/sec. A strong temperature dependence of the dislocation velocity was observed. The results can only be correlated with theories of a single thermally activated mechanism if a substantial entropy of activation exists. Alternative explanations of the experimental results in terms of multiple processes and differences in slip band structure are proposed.
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