Spin-driven ordering of Cr in the equiatomic high entropy alloy NiFeCrCo

Journal Article · Mon Apr 20 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4918996· OSTI ID:22398922

Niu, C.; Zaddach, A. J.; Oni, A. A.; Sang, X.; LeBeau, J. M.; Koch, C. C.; Hurt, J. W. ^[1]

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1. Department of Physics, Furman University, Greenville, South Carolina 29613 (United States)

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 L1{sub 2} structure. The fully Cr-ordered alloyed L1{sub 2} 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.

• OSTI ID: 22398922
• Journal Information: Applied Physics Letters, Vol. 106, Issue 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CASTING
CHROMIUM
COBALT
ENTROPY
FCC LATTICES
FERROMAGNETIC MATERIALS
FERROMAGNETISM
INTERMETALLIC COMPOUNDS
IRON
MAGNETIC MOMENTS
NICKEL
RANDOMNESS
SOLID SOLUTIONS
SPIN
TRANSMISSION ELECTRON MICROSCOPY