Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion
Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion
A CoCrFeNiMn high-entropy alloy was processed by high-pressure torsion to produce a grain size of ~10 nm and then tested in tension at elevated temperatures from 773 to 1073 K using strain rates in the range from 1.0×10?3 to 1.0×10?1 s?1. The alloy exhibited excellent ductility at these elevated temperatures including superplastic elongations with a maximum elongation of >600% at a testing temperature of 973 K. It is concluded that the formation of precipitates and the sluggish diffusion in the HEA inhibit grain growth and contribute to a reasonable stability of the fine-grained structure at elevated temperatures. The results show the activation energy for flow matches the anticipated value for grain boundary diffusion in nickel but the strain rate sensitivity is low due to the occurrence of some grain growth at these high testing temperatures
342-348
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
He, Junyang
cafc9d17-af90-4f09-8988-61c9ccb9b6bb
Lu, Zhaoping
33e0322f-c987-46e1-a857-6ed7b7275241
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
8 February 2017
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
He, Junyang
cafc9d17-af90-4f09-8988-61c9ccb9b6bb
Lu, Zhaoping
33e0322f-c987-46e1-a857-6ed7b7275241
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed, He, Junyang, Lu, Zhaoping, Kawasaki, Megumi and Langdon, Terence G.
(2017)
Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion.
Materials Science and Engineering: A, 685, .
(doi:10.1016/j.msea.2017.01.016).
Abstract
A CoCrFeNiMn high-entropy alloy was processed by high-pressure torsion to produce a grain size of ~10 nm and then tested in tension at elevated temperatures from 773 to 1073 K using strain rates in the range from 1.0×10?3 to 1.0×10?1 s?1. The alloy exhibited excellent ductility at these elevated temperatures including superplastic elongations with a maximum elongation of >600% at a testing temperature of 973 K. It is concluded that the formation of precipitates and the sluggish diffusion in the HEA inhibit grain growth and contribute to a reasonable stability of the fine-grained structure at elevated temperatures. The results show the activation energy for flow matches the anticipated value for grain boundary diffusion in nickel but the strain rate sensitivity is low due to the occurrence of some grain growth at these high testing temperatures
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Accepted/In Press date: 5 January 2017
e-pub ahead of print date: 6 January 2017
Published date: 8 February 2017
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 404410
URI: http://eprints.soton.ac.uk/id/eprint/404410
ISSN: 0921-5093
PURE UUID: 04a96c7b-1e33-4ee4-bec4-074de1fba2a8
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Date deposited: 09 Jan 2017 09:51
Last modified: 16 Mar 2024 03:28
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Author:
Hamed Shahmir
Author:
Junyang He
Author:
Zhaoping Lu
Author:
Megumi Kawasaki
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