Journal
SCRIPTA MATERIALIA
Volume 72-73, Issue -, Pages 59-62Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.10.020
Keywords
Severe plastic deformation; Ultrafine-grained material; Dynamic recrystallization; Derby relation; Geometrically necessary dislocations
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Funding
- French State through the program Investment in the Future
- National Research Agency (ANR) [ANR-11-LABX-0008-01]
- ANR project (ANR HYPERTUBE) of the French National Research Agency
- Agence Nationale de la Recherche (ANR) [ANR-11-LABX-0008] Funding Source: Agence Nationale de la Recherche (ANR)
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It was documented by Derby in 1992 that the flow stress is in power-law relationship with the steady-state grain size obtained in dynamic recrystallization. This relation has been found valid in this paper also for ultrafine-grained metals that can be obtained by severe plastic deformation. For these materials, the exponent is -0.5, which is the Hall-Petch relation. In copper, a uniform dislocation density without geometrically necessary dislocations is valid for this state. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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