On the stress discrepancy at low-temperatures in pure iron

Daniel Caillard (1)

1 CEMES - Centre d'élaboration de matériaux et d'études structurales

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

Domaines: Physique [physics]

Daniel Caillard. On the stress discrepancy at low-temperatures in pure iron. Acta Materialia, 2014, 62 (1), pp.267-275. ⟨10.1016/j.actamat.2013.10.007⟩. ⟨hal-01726241⟩