On the stress discrepancy at low-temperatures in pure iron

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 thermodynami...

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Bibliographic Details
Published in:Acta materialia 2014-01, Vol.62 (1), p.267-275
Main Author: Caillard, D.
Format: Article
Language:English
Subjects:
Applied sciences
Dislocations
Exact sciences and technology
In situ experiments
Iron
Metals. Metallurgy
Physics
Transmission electron microscopy
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Summary: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.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2013.10.007