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Role of deformation twinning in fatigue of CrCoNi medium-entropy alloy at room temperature
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SYSNO ASEP 0542936 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Role 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 authors 8 Article number 113985 Source Title Scripta Materialia. - : Elsevier - ISSN 1359-6462
Roč. 202, SEP (2021)Number of pages 6 s. Language eng - English Country GB - United Kingdom Keywords Medium- and high-entropy Alloys ; Deformation twinning ; Fatigue ; Crack initiation ; Crack initiation Subject RIV JG - Metallurgy OECD category Materials engineering Method of publishing Limited access Institutional support UFM-A - RVO:68081723 UT WOS 000663221900009 EID SCOPUS 85106349521 DOI 10.1016/j.scriptamat.2021.113985 Annotation Cylindrical 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S1359646221002657?via%3Dihub
Number of the records: 1