Elevated-temperature cyclic deformation mechanisms of CoCrNi in comparison to CoCrFeMnNi

Lu, K and Knöpfle, F and Chauhan, A and Litvinov, D and Schneider, M and Laplanche, G and Aktaa, J (2022) Elevated-temperature cyclic deformation mechanisms of CoCrNi in comparison to CoCrFeMnNi. In: Scripta Materialia, 220 .

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Abstract

We report the cyclic deformation behavior of CoCrNi at 550 °C under a strain amplitude of ± 0.5 and compare it to that of CoCrFeMnNi. CoCrNi manifests cyclic hardening followed by minor softening and a near-steady state until failure. Transmission electron microscopy investigations of CoCrNi revealed that increasing the number of cycles from 10 to 2500/5000 leads to a transition of dislocation arrangements from slip bands to tangles. Compared to CoCrFeMnNi, CoCrNi exhibits higher strength, longer lifetime and persistent serrated flow. Owing to its lower stacking fault energy (even at 550 °C), planar slip is more pronounced in CoCrNi than CoCrFeMnNi, which additionally shows wavy slip.

Item Type:	Journal Article
Publication:	Scripta Materialia
Publisher:	Acta Materialia Inc
Additional Information:	The copyright for this article belongs to the Acta Materialia Inc.
Keywords:	Cobalt alloys; Deformation; Fatigue of materials; High resolution transmission electron microscopy; Iron alloys; Manganese alloys; Ternary alloys; Transmissions, Cyclic deformation behaviours; Cyclic deformations; Cyclic hardening; Deformation mechanism; Dislocation; Elevated temperature; Multi-principal element alloy; Number of cycles; Steady state; Strain amplitude, Chromium alloys
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	10 Aug 2022 05:29
Last Modified:	10 Aug 2022 05:29
URI:	https://eprints.iisc.ac.in/id/eprint/75764

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