skip to main content

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

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.
Authors:
; ; ; ; ; ;  [1] ;  [2]
  1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)
  2. Department of Physics, Furman University, Greenville, South Carolina 29613 (United States)
Publication Date:
OSTI Identifier:
22398922
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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