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In situ study of thermally activated flow and dynamic restoration of ultrafine-grained pure Cu at 373 K
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SYSNO ASEP 0483092 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title In situ study of thermally activated flow and dynamic restoration of ultrafine-grained pure Cu at 373 K Author(s) Blum, W. (DE)
Král, Petr (UFM-A) RID, ORCID
Dvořák, Jiří (UFM-A) RID, ORCID
Petrenec, M. (CZ)
Eisenlohr, P. (US)
Sklenička, Václav (UFM-A) RID, ORCIDNumber of authors 6 Source Title Journal of Materials Research. - : Springer - ISSN 0884-2914
Roč. 32, č. 24 (2017), s. 4514-4521Number of pages 8 s. Language eng - English Country US - United States Keywords Cu ; dynamic grain coarsening ; dynamic recovery ; ECAP ; in situ ; stress relaxation ; UFG Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000419001500007 EID SCOPUS 85030836558 DOI 10.1557/jmr.2017.343 Annotation Pure Cu was made ultrafine-grained by equal channel angular pressing on route BC at ambient
temperatures and deformed in situ in a scanning electron microscope at the elevated temperature
of 373 K and at a constant total strain rate of 10-4 s-1. Deformation was repetitively stopped to
take micrographs of the grain structure on the same area of observation, revealing limited activity
of discontinuous dynamic recrystallization. During the stops of deformation, the flow stress was
relaxing. The relaxation of stress as function of time was used to determine the rate of inelastic
deformation as a function of stress, from which the activation volume V of the thermally
activated flow was derived. It is found that the normalized values of V were lying in the same
order generally found for coarse-grained pure materials. This seems to be in conflict with the
literature. However, the conflict is resolved by noting that the literature results refer to quasistationary
deformation with the concurrent dynamic recovery in contrast to the present results
obtained at a virtually constant microstructure. The interpretation of the two kinds of activation
volumes for thermally activated flow is discussed.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2018
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