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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... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Effect of carbon content and annealing on structure and hardness of CrFe2NiMnV0.25 high-entropy alloys processed by high-pressure torsion

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
DOI
10.1007/s10853-018-2456-4
Publisher site
See Article on Publisher Site

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.

Journal

Journal of Materials Science – Springer Journals

Published: May 23, 2018

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