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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 ASEP0483092
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleIn 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, ORCID
    Number of authors6
    Source TitleJournal of Materials Research. - : Springer - ISSN 0884-2914
    Roč. 32, č. 24 (2017), s. 4514-4521
    Number of pages8 s.
    Languageeng - English
    CountryUS - United States
    KeywordsCu ; dynamic grain coarsening ; dynamic recovery ; ECAP ; in situ ; stress relaxation ; UFG
    Subject RIVJG - Metallurgy
    OECD categoryMaterials engineering
    R&D ProjectsLQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
    Institutional supportUFM-A - RVO:68081723
    UT WOS000419001500007
    EID SCOPUS85030836558
    DOI10.1557/jmr.2017.343
    AnnotationPure 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.
    WorkplaceInstitute of Physics of Materials
    ContactYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Year of Publishing2018
Number of the records: 1  

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