Spin-driven ordering of Cr in the equiatomic high entropy alloy NiFeCrCo. Niu, C, Zaddach, A J, Oni, A A, Sang, X, Hurt, J W, LeBeau, J M, Koch, C C, & Irving, D L Appl. Phys. Lett., 106(16):161906, AIP Publishing, April, 2015.
doi  abstract   bibtex   
Spin-driven ordering of Cr in an equiatomic fcc NiFeCrCo high entropy alloy (HEA) was predicted by first-principles calculations. Ordering of Cr is driven by the reduction in energy realized by surrounding anti-ferromagnetic Cr with ferromagnetic Ni, Fe, and Co in an alloyed L12 structure. The fully Cr-ordered alloyed L12 phase was predicted to have a magnetic moment that is 36% of that for the magnetically frustrated random solid solution. Three samples were synthesized by milling or casting/annealing. The cast/annealed sample was found to have a low temperature magnetic moment that is 44% of the moment in the milled sample, which is consistent with theoretical predictions for ordering. Scanning transmission electron microscopy measurements were performed and the presence of ordered nano-domains in cast/annealed samples throughout the equiatomic NiFeCrCo HEA was identified.
@ARTICLE{Niu2015-rh,
  title     = "Spin-driven ordering of Cr in the equiatomic high entropy alloy
               {NiFeCrCo}",
  author    = "Niu, C and Zaddach, A J and Oni, A A and Sang, X and Hurt, J W
               and LeBeau, J M and Koch, C C and Irving, D L",
  abstract  = "Spin-driven ordering of Cr in an equiatomic fcc NiFeCrCo high
               entropy alloy (HEA) was predicted by first-principles
               calculations. Ordering of Cr is driven by the reduction in
               energy realized by surrounding anti-ferromagnetic Cr with
               ferromagnetic Ni, Fe, and Co in an alloyed L12 structure. The
               fully Cr-ordered alloyed L12 phase was predicted to have a
               magnetic moment that is 36\% of that for the magnetically
               frustrated random solid solution. Three samples were synthesized
               by milling or casting/annealing. The cast/annealed sample was
               found to have a low temperature magnetic moment that is 44\% of
               the moment in the milled sample, which is consistent with
               theoretical predictions for ordering. Scanning transmission
               electron microscopy measurements were performed and the presence
               of ordered nano-domains in cast/annealed samples throughout the
               equiatomic NiFeCrCo HEA was identified.",
  journal   = "Appl. Phys. Lett.",
  publisher = "AIP Publishing",
  volume    =  106,
  number    =  16,
  pages     = "161906",
  month     =  apr,
  year      =  2015,
  keywords  = "LeBeau;HEA DMREF;HfO2",
  issn      = "0003-6951",
  doi       = "10.1063/1.4918996"
}

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