Spin-driven ordering of Cr in the equiatomic high entropy alloy NiFeCrCo
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 20, 2015
- Source ID
- 10.1063/1.4918996
Entities
People
- A. A. Oni
- A.J. Zaddach
- C. C. Koch
- Changning Niu
- D. L. Irving
- J. M. Lebeau
- J. W. Hurt
- X. Sang
Organizations
- Air Force Office of Scientific Research
- Furman University
- National Science Foundation
- North Carolina State University