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Journal of Materials Science
Erschienen in: Journal of Materials Science 16/2018

23.05.2018 | Metals

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

verfasst von: Hamed Shahmir, Elena Tabachnikova, Aleksey Podolskiy, Mikhail Tikhonovsky, Terence G. Langdon

Erschienen in: Journal of Materials Science | Ausgabe 16/2018

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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.
Vorheriger Artikel Spatial distribution of Cr-bearing species on the corroded tube surface characterised by synchrotron X-ray fluorescence (SXRF) mapping and micro-XANES: exposure of tubes in oxy-firing flue gas
Nächster Artikel Recrystallization and grain growth of a nano/ultrafine structured austenitic stainless steel during annealing under high hydrostatic pressure

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Metadaten
Titel
Effect of carbon content and annealing on structure and hardness of CrFe2NiMnV0.25 high-entropy alloys processed by high-pressure torsion
verfasst von
Hamed Shahmir
Elena Tabachnikova
Aleksey Podolskiy
Mikhail Tikhonovsky
Terence G. Langdon
Publikationsdatum
23.05.2018
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 16/2018
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-018-2456-4

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