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Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature

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    SYSNO ASEP0542936
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleRole of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature
    Author(s) Heczko, Milan (UFM-A) ORCID
    Mazánová, Veronika (UFM-A)
    Slone, Connor E. (US)
    Shih, M. (US)
    George, E.P. (US)
    Ghazisaedi, M. (US)
    Polák, Jaroslav (UFM-A) RID, ORCID
    Mills, M. J. (US)
    Number of authors8
    Article number113985
    Source TitleScripta Materialia. - : Elsevier - ISSN 1359-6462
    Roč. 202, SEP (2021)
    Number of pages6 s.
    Languageeng - English
    CountryGB - United Kingdom
    KeywordsMedium- and high-entropy Alloys ; Deformation twinning ; Fatigue ; Crack initiation ; Crack initiation
    Subject RIVJG - Metallurgy
    OECD categoryMaterials engineering
    Method of publishingLimited access
    Institutional supportUFM-A - RVO:68081723
    UT WOS000663221900009
    EID SCOPUS85106349521
    AnnotationCylindrical specimens of CrCoNi alloy with electropolished surfaces were subjected to constant total strain amplitude low cycle fatigue. The alloy exhibited an initial period of cyclic hardening followed by cyclic softening until failure occurred. At the end of hardening stage at the peak of cyclic stress, well-developed persistent slip markings (PSMs) consisting of extrusions and intrusions were associated with thin deformation twins. A sophisticated experimental workflow was designed to extract information from the surface and the bulk of tested material. A combination of SEM, EBSD, ECCI, FIB and HR-STEM was used to study the internal structure and the surface profiles around the deformation twins, which were produced during the initial period of cyclic loading. Furthermore, localized cyclic plastic strain and stress concentrations near deformation twins led not only to early, well-developed PSMs, but also to the activation of TWIP and TRIP plasticity even at low macroscopic stress amplitudes.
    WorkplaceInstitute of Physics of Materials
    ContactYvonna Šrámková,, Tel.: 532 290 485
    Year of Publishing2022
    Electronic address
Number of the records: 1