| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnetics and the Critical Materials Challenge: An FMD Symposium Honoring Matthew J. Kramer
|
| Presentation Title |
Far-from-equilibrium Materials Processing |
| Author(s) |
Jeffrey E. Shield |
| On-Site Speaker (Planned) |
Jeffrey E. Shield |
| Abstract Scope |
One approach to developing new materials, or optimizing existing materials, is by using far-from-equilibrium processing to create materials which are either metastable or difficult-to-obtain equilibrium phases. With respect to permanent magnet materials, two examples are MnAl and FeNi. Both relevant phases form in the L10 structure, but in MnAl the phase is metastable while in FeNi it is stable but difficult (impossible?) to form. In this paper, we will use inert gas condensation to produce nanoparticles in these and other alloys in order to produce magnetic materials. Modifying the plasma characteristics can promote either highly disordered structures, enabling diffusion or transitions to metastable or non-equilibrium phases, or in-plasma annealing that promotes atomic rearrangements in situ. Indications of L10 formation in FeNi have been observed in as-deposited Fe-Ni nanoparticles. In other alloy systems, the significant extension of solid solubility far beyond achievable by other processing methods provide pathways to new materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Nanotechnology, Characterization |