Počet záznamů: 1
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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název In situ study of thermally activated flow and dynamic restoration of ultrafine-grained pure Cu at 373 K Tvůrce(i) 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, ORCIDCelkový počet autorů 6 Zdroj.dok. Journal of Materials Research. - : Springer - ISSN 0884-2914
Roč. 32, č. 24 (2017), s. 4514-4521Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova Cu ; dynamic grain coarsening ; dynamic recovery ; ECAP ; in situ ; stress relaxation ; UFG Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP LQ1601 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UFM-A - RVO:68081723 UT WOS 000419001500007 EID SCOPUS 85030836558 DOI 10.1557/jmr.2017.343 Anotace 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.Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2018
Počet záznamů: 1