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Effective and back stresses evolution upon cycling a high-entropy alloy

Lu, Kaiju ORCID iD icon 1; Chauhan, Ankur 1; Knöpfle, Fabian 1; Aktaa, Jarir 1
1 Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI), Karlsruher Institut für Technologie (KIT)

Abstract:

We report on the effective and back stresses evolution of a CoCrFeMnNi high-entropy alloy (HEA) by partitioning its cyclic hysteresis loops. It was found that the cyclic stress response of the HEA predominantly originates from the back stress evolution. Back stress also increases significantly with increasing strain amplitude and reducing grain size. However, the change of effective stress is rather insignificant with altering cycle number, strain amplitude and grain size. This indicates that the effective stress is determined mainly by the lattice friction. Further comparisons to an austenitic steel and a medium-entropy alloy identified the origins of their peculiar cyclic strength.

The effective stress and back stress upon cycling a HEA are assessed, both of which are higher than a conventional FCC steel, contributing to the HEA’s higher cyclic strength.


Verlagsausgabe §
DOI: 10.5445/IR/1000148525
Veröffentlicht am 12.07.2022
Originalveröffentlichung
DOI: 10.1080/21663831.2022.2054667
Scopus
Zitationen: 15
Web of Science
Zitationen: 11
Dimensions
Zitationen: 15
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 03.06.2022
Sprache Englisch
Identifikator ISSN: 2166-3831
KITopen-ID: 1000148525
HGF-Programm 38.04.01 (POF IV, LK 01) Gas turbines
Erschienen in Materials Research Letters
Verlag Taylor & Francis Open Access
Band 10
Heft 6
Seiten 369–376
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 23.03.2022
Schlagwörter High-entropy alloy; fatigue; effective stress; back stress
Nachgewiesen in Scopus
Dimensions
Web of Science
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