About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
Evaluation of Medium-entropy FexCoyNiz Alloys as Precursors for FeCoNi-based High Entropy Magnetic Alloys |
Author(s) |
Alex A Paul, Tanjore V. Jayaraman |
On-Site Speaker (Planned) |
Tanjore V. Jayaraman |
Abstract Scope |
High-entropy magnetic alloys present an excellent combination of functional and structural properties that broadens the space for developing high-performance magnetic alloys for several energy conversion applications. We evaluated the suitability of several FexCoyNiz alloy compositions, whose configurational entropy (ΔSconfig) is higher than ~9 J/mol K, as a precursor for FeCoNi-based high entropy magnetic alloys. We evaluated and compared the structure and magnetic properties of mechanically alloyed FexCoyNiz over a range of temperatures—structure by x-ray diffraction and electron microscopy, and magnetic properties by vibrating sample magnetometry. Most compositions comprised the γ phase and the rest γ + α phase. The magnetic saturation (Ms) was as high as ~150 Am2/kg and coercivity (Hc) as high as ~5 kA/m. The magnetic anisotropy (K) was on the order of 10^6 J/m3. The Ms and Hc increased at sub-ambient temperatures. With the increase in thermal-treatment temperature, the MS and Hc increased and decreased, respectively. |
Proceedings Inclusion? |
Planned: |