About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
Oxidation and crystallization behavior of Co-based amorphous/nanocomposite alloys |
| Author(s) |
Yuankang Wang, Alex Leary, Paul Ohodnicki |
| On-Site Speaker (Planned) |
Yuankang Wang |
| Abstract Scope |
Co-based amorphous and nanocomposite soft magnetic alloys are promising for high-temperature aerospace and electrical applications due to their excellent magnetic properties. However, their long-term performance is often degraded by oxidation and the formation of detrimental borides. Annealing, while necessary to induce the desired nanocomposite microstructure, also accelerates surface oxidation, altering local structure and degrading magnetic behavior. Our previous work showed that minor additions of Nb and Si significantly improved crystallization resistance, with Si also enhancing oxidation resistance. In this study, TGA, in-situ TEM, and FIB were employed to investigate how alloying additions influence oxidation and crystallization. The results reveal a strong coupling between crystallization and oxidation near the surface. In particular, the formation of Si-rich protective oxide not only improves oxidation resistance but also suppresses FCC-Co grain coarsening in the surface region. These insights support the design of oxidation-resistant Co-based soft magnetic alloys with improved thermal stability. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Phase Transformations, Characterization |