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Effect of grain size on strength and strain rate sensitivity in the CrMnFeCoNi high-entropy alloy

Effect of grain size on strength and strain rate sensitivity in the CrMnFeCoNi high-entropy alloy
Effect of grain size on strength and strain rate sensitivity in the CrMnFeCoNi high-entropy alloy
It was shown recently that the grain size contribution to the flow stress and strain rate sensitivity of pure metals having different structures can be estimated by the model of deformation by grain boundary sliding. The present research extends this earlier study by estimating the grain size contribution to the flow stress in the CrMnCoFeNi high entropy alloy. This alloy has attracted significant attention in recent years due to its remarkable mechanical properties which include a higher strength compared to f.c.c. pure metals due to a significant contribution from solid solution strengthening. The present work demonstrates that the flow stress of the CrMnCoFeNi alloy can be readily estimated from the sum of the contributions from solid solution and grain size strengthening. There are some unique experimental trends observed in this alloy and these provide supporting evidence for the assumption that the grain size strengthening is thermally-activated. The flow stress, strain rate sensitivity, activation volume and activation energy are predicted for different grain sizes and testing conditions as a function of the fundamental properties of this alloy and the results show excellent agreement with the reported experimental data.
CrMnCoFeNi alloy, deformation mechanisms, strain rate sensitivity, strength, ultrafine grains
2238-7854
2358 - 2368
Figueiredo, Roberto B.
8fb6251c-f4d3-418c-acae-0835a4f56e15
Wolf, Witor
d366e844-3024-4802-bad6-aa5551bbb8a3
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B.
8fb6251c-f4d3-418c-acae-0835a4f56e15
Wolf, Witor
d366e844-3024-4802-bad6-aa5551bbb8a3
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Figueiredo, Roberto B., Wolf, Witor and Langdon, Terence G. (2022) Effect of grain size on strength and strain rate sensitivity in the CrMnFeCoNi high-entropy alloy. Journal of Materials Research and Technology, 20, 2358 - 2368. (doi:10.1016/j.jmrt.2022.07.181).

Record type: Article

Abstract

It was shown recently that the grain size contribution to the flow stress and strain rate sensitivity of pure metals having different structures can be estimated by the model of deformation by grain boundary sliding. The present research extends this earlier study by estimating the grain size contribution to the flow stress in the CrMnCoFeNi high entropy alloy. This alloy has attracted significant attention in recent years due to its remarkable mechanical properties which include a higher strength compared to f.c.c. pure metals due to a significant contribution from solid solution strengthening. The present work demonstrates that the flow stress of the CrMnCoFeNi alloy can be readily estimated from the sum of the contributions from solid solution and grain size strengthening. There are some unique experimental trends observed in this alloy and these provide supporting evidence for the assumption that the grain size strengthening is thermally-activated. The flow stress, strain rate sensitivity, activation volume and activation energy are predicted for different grain sizes and testing conditions as a function of the fundamental properties of this alloy and the results show excellent agreement with the reported experimental data.

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Roberto-JMRT-S-22-02460 - Accepted Manuscript
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Accepted/In Press date: 22 July 2022
e-pub ahead of print date: 12 August 2022
Published date: 26 August 2022
Keywords: CrMnCoFeNi alloy, deformation mechanisms, strain rate sensitivity, strength, ultrafine grains

Identifiers

Local EPrints ID: 469824
URI: http://eprints.soton.ac.uk/id/eprint/469824
ISSN: 2238-7854
PURE UUID: fd55ef72-a953-4e8e-99b6-73208d61698d
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 27 Sep 2022 16:30
Last modified: 31 Oct 2022 05:01

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Contributors

Author: Roberto B. Figueiredo
Author: Witor Wolf

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