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

Bhattacharya, Rahul LU ; Annasamy, Murugesan ; Cizek, Pavel ; Kamaraj, M. ; Muralikrishna, G. Mohan ; Hodgson, Peter ; Fabijanic, Daniel and Murty, B. S. (2022) In Journal of Materials Research 37. p.959-975
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... (More)

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.]

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author
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
High-entropy alloys, Mechanical alloying, Nanostructure, Precession nanobeam diffraction, Spark plasma sintering, Transmission electron microscopy
in
Journal of Materials Research
volume
37
pages
17 pages
publisher
Springer
external identifiers
  • scopus:85124362704
ISSN
0884-2914
DOI
10.1557/s43578-021-00483-0
language
English
LU publication?
no
id
99eb8066-275d-4858-a16c-98f05d9adca8
date added to LUP
2025-08-28 21:04:09
date last changed
2025-09-22 11:44:51
@article{99eb8066-275d-4858-a16c-98f05d9adca8,
  abstract     = {{<p>Nanocrystalline Al<sub>x</sub>CoCrFeNi (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 &lt; 10 nm for MA powders and &lt; 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 Al<sub>0.3</sub>CoCrFeNi, whereas Fe dominates FCC phase of Al<sub>0.6</sub>CoCrFeNi and AlCoCrFeNi. Carbon and Oxygen addition during milling process resulted in nanoscale dispersion of Cr<sub>7</sub>C<sub>3</sub> carbide and Cr<sub>2</sub>O<sub>3</sub> /Al<sub>2</sub>O<sub>3</sub> post-SPS. The hardness of AlCoCrFeNi (730HV<sub>0.3</sub>) was the highest among all MA-SPS alloys. Graphical abstract: [Figure not available: see fulltext.]</p>}},
  author       = {{Bhattacharya, Rahul and Annasamy, Murugesan and Cizek, Pavel and Kamaraj, M. and Muralikrishna, G. Mohan and Hodgson, Peter and Fabijanic, Daniel and Murty, B. S.}},
  issn         = {{0884-2914}},
  keywords     = {{High-entropy alloys; Mechanical alloying; Nanostructure; Precession nanobeam diffraction; Spark plasma sintering; Transmission electron microscopy}},
  language     = {{eng}},
  month        = {{02}},
  pages        = {{959--975}},
  publisher    = {{Springer}},
  series       = {{Journal of Materials Research}},
  title        = {{Evolution of phase constitution with mechanical alloying and spark plasma sintering of nanocrystalline Al<sub> x</sub>CoCrFeNi (x = 0, 0.3, 0.6, 1 mol) high-entropy alloys}},
  url          = {{http://dx.doi.org/10.1557/s43578-021-00483-0}},
  doi          = {{10.1557/s43578-021-00483-0}},
  volume       = {{37}},
  year         = {{2022}},
}