About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
Tunable Magnetic Properties in High-entropy FeCoNiAlxSix (0.2 < x < 0.5) Alloys |
Author(s) |
Kathem Bazzi, Ramasis Goswami, Tanjore V. Jayaraman |
On-Site Speaker (Planned) |
Tanjore V. Jayaraman |
Abstract Scope |
High-entropy FeCoNiAlxSix alloys exhibit decent soft-magnetic and electromagnetic properties. We present the tunability of the soft-magnetic properties facilitated by the presence of metastable f.c.c. phase, instead of the stable f.c.c and b.c.c. phases, in the high-entropy alloys. The mechanically alloyed FeCoNiAl0.375Si0.375 resulted in the formation of a single-phase—metastable f.c.c.—alloy. At ambient temperature, the specific magnetization (σS) and coercivity (HC) of the as-prepared alloy was ~91 Am2/kg and ~5 kA/m, respectively. The magnetic characterization from 60 K to 900 K showed a steady decrease in MS, but the HC initially decreased and subsequently increased. The metastable phase was stable up to ~800 K and after that dissociated. Thermal-treatment improved the soft-magnetic properties while retaining the nanocrystallinity. While fabrication by equilibrium processing facilitates the formation of two stable phases—b.c.c. and f.c.c., mechanical alloying promotes the formation of metastable f.c.c. phase having relatively superior soft-magnetic properties and good thermal stability. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |