| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
A-9: Enhanced Hard Magnetism of Synthetic L10-FeNi |
| Author(s) |
Ihor Hlova, Yaroslav Mudryk, Anis Biswas |
| On-Site Speaker (Planned) |
Ihor Hlova |
| Abstract Scope |
An ordered tetragonal L10-FeNi, also known as meteoritic mineral tetrataenite – a promising rare-earth-free hard-magnetic compound – has been synthesized starting from a mechanochemically-activated disordered cubic A1-FeNi via formation of a chemically-ordered FeNiN intermediate and its subsequent denitrogenation and further purification of the product. Nature of a process control agent employed during the mechanochemical activation of A1-FeNi and ammonia flow velocity during the synthesis of the intermediate are two of the main factors controlling the nitrogenation. Denitrogenation with hydrogen at elevated pressures and at temperatures substantially below the order-disorder transition preserves the chemical order established in the intermediate. Post-synthesis refinement of the L10-FeNi product includes removal of residual nitrides with a dilute acid to further improve hard-magnetic properties of the material. The thus synthesized L10-FeNi powders exhibit coercivity as high as 2.3 kOe and maximum energy product reaching 6 MGOe – the highest values ever reported for a synthetic tetrataenite. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Energy Conversion and Storage, Phase Transformations |