On the stress discrepancy at low-temperatures in pure iron
Résumé
We present a complete analysis of the velocity of individual screw dislocations in pure iron, as a function of stress and temperature, by means of in situ straining experiments in a transmission electron microscope. The results show a very pronounced deviation from the classical laws of thermodynamics, which is at the origin of the discrepancy between experimental and calculated deformation stresses at low temperature. This strongly supports the occurrence of large quantum effects proposed in a recent theoretical study. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Mots clés
Dislocations (crystals)
High resolution transmission electron microscopy
Iron
Quantum electronics
Quantum theory
Screw dislocations
Thermodynamics
Transmission electron microscopy
Deformation stress
In-situ experiments
In-situ straining
Laws of thermodynamics
Low temperatures
Pure iron
Quantum effects
Theoretical study
Temperature