Low-cycle fatigue behavior and deformation mechanisms of a dual-phase Al0.5CoCrFeMnNi high-entropy alloy

Lu, K and Knöpfle, F and Chauhan, A and Jeong, HT and Litvinov, D and Walter, M and Kim, WJ and Aktaa, J (2022) Low-cycle fatigue behavior and deformation mechanisms of a dual-phase Al0.5CoCrFeMnNi high-entropy alloy. In: International Journal of Fatigue, 163 .

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Abstract

We uncover the low-cycle fatigue response and deformation mechanisms of a dual-phase Al0.5CoCrFeMnNi high-entropy alloy (HEA) by comparing to CoCrFeMnNi HEA. Al0.5CoCrFeMnNi demonstrates higher cyclic stress resistance, meanwhile maintaining comparable cyclic strain resistance at low-to-medium strain amplitudes. Microstructural investigations revealed dislocation slip as the primary deformation mechanism, which changes from planar slip to wavy slip with increasing strain amplitude. The enhanced cyclic stress resistance is related to precipitation hardening and improved solid solution strengthening. Meanwhile, the comparable cyclic strain resistance is ascribed to their similar deformation mode. Lastly, comparisons with Al0.5CoCrFeNi and CoCrNi alloys provide strategies for tailoring HEAs with enhanced fatigue resistance.

Item Type:	Journal Article
Publication:	International Journal of Fatigue
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Dislocation; Dual-phase; Fatigue; High-entropy alloy; Transmission electron microscopy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Jul 2022 05:37
Last Modified:	04 Jul 2022 05:37
URI:	https://eprints.iisc.ac.in/id/eprint/74114

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