Temperature-dependent cyclic deformation behavior of CoCrFeMnNi high-entropy alloy

Lu, K and Chauhan, A and Litvinov, D and Aktaa, J (2022) Temperature-dependent cyclic deformation behavior of CoCrFeMnNi high-entropy alloy. In: International Journal of Fatigue, 160 .

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Abstract

We compare the low-cycle fatigue behavior of a CoCrFeMnNi high-entropy alloy at room-temperature (RT) and 550 °C. The cyclic response at 550 °C manifests no cyclic softening, presence of serrated flow and reduced fatigue life compared to that at RT. Microstructural investigations show that distinctly from the dominating wavy slip at RT, dislocations planar slip complements wavy slip at 550 °C. The unexpected planar slip at 550 °C is ascribed to the increase of stacking fault width, likely due to Suzuki segregation. Furthermore, dislocation slip mode evolution with both strain amplitude and cycle number at 550 °C is revealed. © 2022 Elsevier Ltd

Item Type:	Journal Article
Publication:	International Journal of Fatigue
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Chromium alloys; Cobalt alloys; Entropy; High-entropy alloys; Iron alloys; Low-cycle fatigue; Manganese alloys, Cyclic deformation behaviours; Cyclic response; Cyclic softening; Dislocation; High entropy alloys; Low-cycle fatigue behaviors; Planar slip; Serrated flow; Temperature dependent; Transmission electron microscopy, High resolution transmission electron microscopy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 May 2022 06:35
Last Modified:	16 May 2022 06:35
URI:	https://eprints.iisc.ac.in/id/eprint/71676

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