About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
Investigation of the Phase Formation and Thermal Stability of the Second L10 Phase in the MnAlCu System |
| Author(s) |
Henri Baldino, Noah Schnitzer, Zachary Monem, Sean Rego, Daniel Hedlund, Don Heiman, Boazhi Cui, Like Li, David Muller, Piotr Kulik |
| On-Site Speaker (Planned) |
Henri Baldino |
| Abstract Scope |
The MnAl L10, τ, ferrimagnetic phase is promising commercially if its metastability is resolved. In MnAlCu, an ε-phase immiscibility gap at 3–6 at.% Cu produces two τ-phases of which τ2 from ε2 may have improved thermal stability. To probe τ2, MnAl with 8 at.% Cu was studied for structure, phase transformations, microstructure, and magnetism. The high Cu additions was found to deepen the ε→β-Mn+γ2 eutectoid reaction to at least 453 K, with ε2 transforming to τ2 via a two-step martensitic mechanism at 453 K. The τ2-phase shows improved kinetic stability below the martensite precipitation temperature of 750 K. The magnetic domains were found to follow the martensite plates with a magnetocrystalline anisotropy comparable to Cu free τ MnAl. These results offer insight into the mechanisms by which the MnAl τ-phase can be modified to improve its phase formation ability and increase its thermal stability towards a potential commercial application. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Phase Transformations, |