Evolution of phase constitution with mechanical alloying and spark plasma sintering of nanocrystalline AlxCoCrFeNi (x = 0, 0.3, 0.6, 1 mol) high-entropy alloys

Bhattacharya, Rahul and Annasamy, Murugesan and Murty, B S and et al, . (2022) Evolution of phase constitution with mechanical alloying and spark plasma sintering of nanocrystalline AlxCoCrFeNi (x = 0, 0.3, 0.6, 1 mol) high-entropy alloys. Journal of Materials Research, 37 (4). pp. 959-975. ISSN 0884-2914

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Abstract

Nanocrystalline AlxCoCrFeNi (x = 0, 0.3, 0.6, 1 mol) high-entropy alloys were synthesized by mechanical alloying (MA) and consolidated by spark plasma sintering (SPS). Single-phase face-centered cubic (FCC) structure was achieved with x = 0 and 0.3. Dual-phase body-centered cubic (BCC)/B2 + FCC structure was obtained in x = 0.6 and 1. Complete solid solution was achieved with a significantly reduced duration of MA (10 h) followed by a brief SPS leading to crystallite size of < 10 nm for MA powders and < 60 nm post-SPS. Incremental changes in Al content translate into increase of BCC + B2 phase fraction and alter the co-existing FCC phase composition consequently. Ni dominates FCC phase of CoCrFeNi and Al0.3CoCrFeNi, whereas Fe dominates FCC phase of Al0.6CoCrFeNi and AlCoCrFeNi. Carbon and Oxygen addition during milling process resulted in nanoscale dispersion of Cr7C3 carbide and Cr2O3 /Al2O3 post-SPS. The hardness of AlCoCrFeNi (730HV0.3) was the highest among all MA-SPS alloys. Graphical abstract: [Figure not available: see fulltext.] © 2022, The Author(s), under exclusive licence to The Materials Research Society.

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IITH Creators:
IITH CreatorsORCiD
Murty, B Shttps://orcid.org/0000-0002-4399-8531
Item Type: Article
Uncontrolled Keywords: High-entropy alloys; Mechanical alloying; Nanostructure; Precession nanobeam diffraction; Spark plasma sintering; Transmission electron microscopy
Subjects: Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 18 Jul 2022 11:14
Last Modified: 18 Jul 2022 11:14
URI: http://raiithold.iith.ac.in/id/eprint/9629
Publisher URL: http://doi.org/10.1557/s43578-021-00483-0
OA policy: https://v2.sherpa.ac.uk/id/publication/19039
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