| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
Magnetic and mechanical hardening of nano-lamellar magnets using a thermo-magnetic field |
| Author(s) |
Liuliu Han, Ruth Schwaiger, Kovács András , Dierk Raabe, Nicolas Peter, Jin Wang, Oliver Gutfleisch, Fernando Maccari |
| On-Site Speaker (Planned) |
Liuliu Han |
| Abstract Scope |
Permanent magnets (PMs) based on rare earth (RE) intermetallics are essential for sustainable energy conversion. However, there is a need to develop inexpensive and RE-free PMs because of the high price and supply risk of RE elements. Another challenge is they are often exposed to high mechanical loading during manufacture and use. Nevertheless, most PMs are inherently brittle. Here, we enhance the magnetic and mechanical response of RE-free multicomponent magnets. This is achieved by introducing nanolamellar structures into the Co-Fe-Ni-Al material through eutectoid decomposition under a thermomagnetic field. The thermomagnetic field accelerates the phase decomposition kinetic and leads to smaller lamella spacing and eutectic colony size than the material treated only by thermal activation. The lamellae's size, density, interfaces, and chemistry were carefully tuned to enhance their pinning effect on the magnetic domain walls and dislocation motion, increasing magnetic coercivity and mechanical strength. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, High-Entropy Alloys, Magnetic Materials |