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Temperature dependence of the flow stress and the strain rate sensitivity at the transition from the Peierls mechanism to pinning by localized obstacles

Published online by Cambridge University Press:  15 February 2000

B. V. Petukhov ,
M. Bartsch  and
U. Messerschmidt
B. V. Petukhov*
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Leninskii Prospect 59, Moscow 117333, Russia
M. Bartsch
Affiliation:
Max Planck Institute of Microstructure Physics, Weinberg 2, Halle/Saale 06120, Germany
U. Messerschmidt
Affiliation:
Max Planck Institute of Microstructure Physics, Weinberg 2, Halle/Saale 06120, Germany
*
petukhov@ns.crys.ras.ru
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Abstract

Barriers of very different character such as localized obstacles and the extendedPeierls- Nabarro relief may control the dislocation motion in crystals in different stressand temperature ranges. The great difference in the microscopic parameters characterizingthese two mechanisms, e.g., in the activation volumes, manifests itself even on themacroscopic scale as a strong change of the plastic properties in a rather narrow transitionrange of the temperature. A theory describing the temperature dependence of the flow stressand the strain rate sensitivity near the transition has been developed and compared withexperimental data on the plastic deformation of cubic ZrO2 single crystals in a softorientation.

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Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 9 , Issue 2 , February 2000 , pp. 89 - 95
Copyright
© EDP Sciences, 2000

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