Effect of carbon content and annealing on structure and hardness of CrFe2NiMnV0.25 high entropy alloys processed by high-pressure torsion
Effect of carbon content and annealing on structure and hardness of CrFe2NiMnV0.25 high entropy alloys processed by high-pressure torsion
CrFe2NiMnV0.25C0.075 and CrFe2NiMnV0.25C0.125 high entropy alloys (HEA) were processed by high-pressure torsion (HPT) followed by post-deformation annealing (PDA) at 823 and 1273 K. This severe plastic deformation led to a significant microhardness increment (by a factor of ~2.5) up to ~435 Hv and the microstructures exhibited exceptional grain refinement with average grain sizes of ~30 nm in both HEAs. It was found that the hardness increased up to
~555 Hv after annealing at 823 K due to precipitation of the σ phase but thereafter the hardness decreased to ~195 Hv after annealing at 1273 K which was very close to the value of the initial coarse-grained condition. This behavior is caused by a combination of grain coarsening and a dissolution of the precipitates. These results suggest that the nanocrystalline HEA facilitates the
formation of precipitates owing to the large number of grain boundaries which serve both as fast diffusion pathways and as preferential nucleation sites for precipitate formation.
11813-11822
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Tabachnikova, Еlena
106b8d6f-1034-49ac-8dcb-936e302bab95
Podolskiy, Аleksey
d178e38b-9cf1-46e5-b544-e8eb417a1258
Tikhonovsky, Mikhail
a9b23820-d7b6-46f5-abba-b8658b1c4a41
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
August 2018
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Tabachnikova, Еlena
106b8d6f-1034-49ac-8dcb-936e302bab95
Podolskiy, Аleksey
d178e38b-9cf1-46e5-b544-e8eb417a1258
Tikhonovsky, Mikhail
a9b23820-d7b6-46f5-abba-b8658b1c4a41
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed, Tabachnikova, Еlena, Podolskiy, Аleksey, Tikhonovsky, Mikhail and Langdon, Terence G.
(2018)
Effect of carbon content and annealing on structure and hardness of CrFe2NiMnV0.25 high entropy alloys processed by high-pressure torsion.
Journal of Materials Science, 53 (16), .
(doi:10.1007/s10853-018-2456-4).
Abstract
CrFe2NiMnV0.25C0.075 and CrFe2NiMnV0.25C0.125 high entropy alloys (HEA) were processed by high-pressure torsion (HPT) followed by post-deformation annealing (PDA) at 823 and 1273 K. This severe plastic deformation led to a significant microhardness increment (by a factor of ~2.5) up to ~435 Hv and the microstructures exhibited exceptional grain refinement with average grain sizes of ~30 nm in both HEAs. It was found that the hardness increased up to
~555 Hv after annealing at 823 K due to precipitation of the σ phase but thereafter the hardness decreased to ~195 Hv after annealing at 1273 K which was very close to the value of the initial coarse-grained condition. This behavior is caused by a combination of grain coarsening and a dissolution of the precipitates. These results suggest that the nanocrystalline HEA facilitates the
formation of precipitates owing to the large number of grain boundaries which serve both as fast diffusion pathways and as preferential nucleation sites for precipitate formation.
Text
Shahmir-JMSC-May2018
- Accepted Manuscript
More information
Accepted/In Press date: 12 May 2018
e-pub ahead of print date: 23 May 2018
Published date: August 2018
Identifiers
Local EPrints ID: 420928
URI: http://eprints.soton.ac.uk/id/eprint/420928
ISSN: 0022-2461
PURE UUID: 60ed9513-afc7-4e8c-b47d-b5d8bcb8faa9
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Date deposited: 18 May 2018 16:30
Last modified: 16 Mar 2024 06:37
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Author:
Hamed Shahmir
Author:
Еlena Tabachnikova
Author:
Аleksey Podolskiy
Author:
Mikhail Tikhonovsky
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