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Magnetic Properties of High-Entropy Alloy FeCoNiTi.
Jiro Kitagawa1, Daiki Shintaku1
1Department of Electrical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, Fukuoka 811-0295, Japan.
ACS Omega
|September 9, 2024
Summary
This study reveals the complex magnetic properties of the FeCoNiTi high-entropy alloy (HEA), identifying distinct ferromagnetic orderings and a high coercive field in its face-centered cubic phase.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- High-entropy alloys (HEAs) offer tunable properties due to their multi-elemental composition.
- Understanding the magnetic behavior of dual-phase HEAs is crucial for advanced applications.
Purpose of the Study:
- To investigate the magnetic properties of the as-cast FeCoNiTi high-entropy alloy.
- To correlate magnetic transitions with the constituent face-centered cubic (fcc) and hexagonal C14 Laves phases.
- To explore the origin of the high coercive field in the fcc phase.
Main Methods:
- Experimental characterization of magnetic properties.
- Phase analysis of the as-cast FeCoNiTi HEA.
- First-principles electronic structure calculations.
Main Results:
- The FeCoNiTi HEA exhibits three distinct ferromagnetic orderings at 1084 K (fcc phase), 214 K (C14 phase), and 168 K (fcc phase).
- The fcc phase displays a significant coercive field of 667 Oe at 400 K.
- Electronic structure calculations confirm ferromagnetic ground states for both fcc and C14 phases.
Conclusions:
- The magnetic properties of FeCoNiTi HEA are strongly influenced by its dual-phase nature.
- The C14 phase plays a key role in the intermediate magnetic transition at 214 K.
- The fcc phase exhibits robust ferromagnetism with a notable high-temperature coercive field, warranting further investigation.
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