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Effect of Cr content on FCC phase fraction of nanocrystalline AlCoCrxFeNi high entropy alloys synthesized by mechanical alloying and spark plasma sintering

Bhattacharya, Rahul LU and Fabijanic, Daniel (2020) International Conference on Nanostructured Materials 2020
Abstract
Cr is known to be a BCC stabilizer in steels. In case of nanocrystalline AlCoCrFeNi high entropy alloys (HEA) synthesized by mechanical alloying (MA) and consolidated by spark plasma sintering (SPS), the systematic increase of Cr content from 0 mole to 1 mole supports and provides for the increase of Fe-Co-Cr rich FCC multicomponent phase. This increase in FCC phase fraction with increasing Cr content further influences the relative elemental distribution among the FCC and BCC/B2 multicomponent phases which in turn effects the
thermal stability, hardness, melting point and oxidation behavior of these HEAs. This can be attributed to the metastable nature of the phases formed in the HEAs synthesized by nonequilibrium synthesis route of... (More)
Cr is known to be a BCC stabilizer in steels. In case of nanocrystalline AlCoCrFeNi high entropy alloys (HEA) synthesized by mechanical alloying (MA) and consolidated by spark plasma sintering (SPS), the systematic increase of Cr content from 0 mole to 1 mole supports and provides for the increase of Fe-Co-Cr rich FCC multicomponent phase. This increase in FCC phase fraction with increasing Cr content further influences the relative elemental distribution among the FCC and BCC/B2 multicomponent phases which in turn effects the
thermal stability, hardness, melting point and oxidation behavior of these HEAs. This can be attributed to the metastable nature of the phases formed in the HEAs synthesized by nonequilibrium synthesis route of MA-SPS. In this work, we intend to investigate the underlying thermodynamic explanation corroborated with experimental evidence for correlating the increase of Cr content and the increase of FCC multicomponent phase and its subsequent effect on various properties. This study is substantiated by extensive TEM and SEM characterization, DSC as well as XRD to draw correlation between the experimental observation and CALPHAD predictions
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type
Contribution to conference
publication status
published
subject
keywords
High entropy alloys, oxidation behaviour, Mechanical alloying, Spark plasma sintering, High resolution transmission electron microscopy, Scanning electron microscope (SEM), X ray diffraction, EDS, EBSD, Scanning Transmission Electron Microscopy, GDOES, Powder metallurgy (PM), Physical Metallugy, Thermodynamics and kinetics, Sintering, Microstructural evolution, Mechanical properties, Annealing, Heat treatment, Casting, Furnace control, CALPHAD
pages
1 pages
conference name
International Conference on Nanostructured Materials 2020
conference location
Australia
conference dates
2020-01-21
language
English
LU publication?
no
additional info
Abstract presented at Symposium B: Nanostructure in High Entropy Alloys
id
4c8bc660-c7bf-450b-9f23-8f8b3c208dba
alternative location
https://search.informit.org/doi/pdf/10.3316/informit.197658577733438
date added to LUP
2025-09-23 17:53:40
date last changed
2025-10-07 10:28:30
@misc{4c8bc660-c7bf-450b-9f23-8f8b3c208dba,
  abstract     = {{Cr is known to be a BCC stabilizer in steels. In case of nanocrystalline AlCoCrFeNi high entropy alloys (HEA) synthesized by mechanical alloying (MA) and consolidated by spark plasma sintering (SPS), the systematic increase of Cr content from 0 mole to 1 mole supports and provides for the increase of Fe-Co-Cr rich FCC multicomponent phase. This increase in FCC phase fraction with increasing Cr content further influences the relative elemental distribution among the FCC and BCC/B2 multicomponent phases which in turn effects the<br/>thermal stability, hardness, melting point and oxidation behavior of these HEAs. This can be attributed to the metastable nature of the phases formed in the HEAs synthesized by nonequilibrium synthesis route of MA-SPS. In this work, we intend to investigate the underlying thermodynamic explanation corroborated with experimental evidence for correlating the increase of Cr content and the increase of FCC multicomponent phase and its subsequent effect on various properties. This study is substantiated by extensive TEM and SEM characterization, DSC as well as XRD to draw correlation between the experimental observation and CALPHAD predictions<br/>}},
  author       = {{Bhattacharya, Rahul and Fabijanic, Daniel}},
  keywords     = {{High entropy alloys; oxidation behaviour; Mechanical alloying; Spark plasma sintering; High resolution transmission electron microscopy; Scanning electron microscope (SEM); X ray diffraction; EDS; EBSD; Scanning Transmission Electron Microscopy; GDOES; Powder metallurgy (PM); Physical Metallugy; Thermodynamics and kinetics; Sintering; Microstructural evolution; Mechanical properties; Annealing; Heat treatment; Casting; Furnace control; CALPHAD}},
  language     = {{eng}},
  title        = {{Effect of Cr content on FCC phase fraction of nanocrystalline AlCoCrxFeNi high entropy alloys synthesized by mechanical alloying and spark plasma sintering}},
  url          = {{https://search.informit.org/doi/pdf/10.3316/informit.197658577733438}},
  year         = {{2020}},
}