Abstract
The temperature dependence of a deforming stress (including both low-temperature decreasing branch and an anomalous high-temperature peak) has been calculated on the basis of one mechanism. The theory developed takes into account spontaneous thermally activated processes of dislocation locking and unlocking and describes the transition from conventional dislocation gliding to the jumpwise motion of dislocations with the change of the temperature (in full accordance with the in situelectron microscopy observations). The dependences of the plasticity characteristics (flow stress, strain-rate sensitivity, etc.) on the microstructural parameters such as free dislocation path and the energy barriers that should be overcome by dislocations for transformation of their cores from the “gliding” to the “sessile states” and back have also been determined.
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Translated from Kristallografiya, Vol. 46, No. 3, 2001, pp. 525–530.
Original Russian Text Copyright © 2001 by Petukhov.
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Petukhov, B.V. The dependence of anomalous temperature peak of a deforming stress on microstructural parameters. Crystallogr. Rep. 46, 474–479 (2001). https://doi.org/10.1134/1.1376480
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DOI: https://doi.org/10.1134/1.1376480