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Double minimum creep of single crystal Ni-base superalloys

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    SYSNO ASEP0464792
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleDouble minimum creep of single crystal Ni-base superalloys
    Author(s) WU, X. (DE)
    Wollgramm, P. (DE)
    Somsen, C. (DE)
    Dlouhý, Antonín (UFM-A) RID
    Kostka, A. (DE)
    Eggeler, G. (DE)
    Number of authors6
    Source TitleActa Materialia. - : Elsevier - ISSN 1359-6454
    Roč. 112, JUN (2016), s. 242-260
    Number of pages19 s.
    Languageeng - English
    CountryGB - United Kingdom
    KeywordsSingle crystal Ni-base superalloys ; Primary creep ; Transmission electron microscopy ; Dislocations ; Stacking faults
    Subject RIVJG - Metallurgy
    R&D ProjectsGA14-22834S GA ČR - Czech Science Foundation (CSF)
    Institutional supportUFM-A - RVO:68081723
    UT WOS000377326400024
    EID SCOPUS84964483770
    DOI10.1016/j.actamat.2016.04.012
    AnnotationLow temperature (750°C) and high stress (800 MPa) creep curves of single crystal superalloy ERBO/1 tensile specimens loaded in the (001) direction show two creep rate minima. Strain rates decrease towards a first sharp local creep rate minimum at 0.1% strain (reached after 30 min). Then deformation rates increase and reach an intermediate maximum at 1% (reached after 1.5 h). Subsequently, strain rates decrease towards a global minimum at 5% (260 h), before tertiary creep (not considered in the present work) leads to final rupture. We combine high resolution miniature creep testing with diffraction contrast transmission electron microscopy and identify elementary processes which govern this double-minimum type of creep behavior. We provide new quantitative information on the evolution of microstructure during low temperature and high stress creep, focusing on γ-channel dislocation activity and stacking fault shear of the γ′-phase. We discuss our results in the light of previous work published in the literature and highlight areas in need of further work.
    WorkplaceInstitute of Physics of Materials
    ContactYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Year of Publishing2017