About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
Novel Rare-Earth-Free L1<sub>o</sub>-Structural Magnets |
| Author(s) |
Ian Baker, Thomas R. Keller, Edwin S Jiang, Annie Jaswal, Ikenna J. Amadi, Si Chen |
| On-Site Speaker (Planned) |
Ian Baker |
| Abstract Scope |
In this presentation, we describe research on two tetragonal (L1<sub>o</sub>-structured) low-cost, potentially-commercially-useful permanent magnets NiFe and tau-MnAl that could replace rare-earth magnets in some applications. However, there are problems associated with the production of both. The issue for NiFe is that the transformation from the high temperature f.c.c. phase to the L1<sub>o</sub>-structured phase occurs at the equiatomic composition at around 320°C and, thus, is extremely slow. For the metastable phase tau-MnAl, different processing methods have either produced high saturation magnetization or high coercivity but not both simultaneously. For each alloy, we outline the effects of ternary alloying additions on the magnetic properties and relate this to changes in the microstructure. In addition, for NiFe we describe the effects of electropulse annealing on the phase transformation. Research funded by the U.S. National Science Foundation and the Irving Institute for Energy and Society at Dartmouth. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Sustainability, |