期刊
JOURNAL OF APPLIED PHYSICS
卷 113, 期 17, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4798340
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资金
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0953733] Funding Source: National Science Foundation
The equimolar alloy FeCoCrNi, a high-entropy alloy, forms in the face-centered-cubic crystal structure and has a ferromagnetic Curie temperature of 130 K. In this study, we explore the effects of Cr concentration, cold-rolling, and subsequent heat treatments on the magnetic properties of FeCoCrxNi alloys. Cr reductions result in an increase of the Curie temperature, and may be used to tune the T-C over a very large temperature range. The magnetic entropy change for a change in applied field of 2T is Delta S-m = -0.35 J/(kg K) for cold-rolled FeCoCrNi. Cold-rolling results in a broadening of Delta S-m, where subsequent heat treatment at 1073 K sharpens the magnetic entropy curve. In all of the alloys, we find that upon heating (after cold-rolling) there is a re-entrant magnetic moment near 730 K. This feature is much less pronounced in the as-cast samples (without cold-rolling) and in the Cr-rich samples, and is no longer observed after annealing at 1073 K. Possible origins of this behavior are discussed. (C) 2013 American Institute of Physics.
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