About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetic Materials
|
| Presentation Title |
Enhanced Powder-Processed Alnico Magnets by Novel Solid-State Engineering of the Microstructure and Nanostructure |
| Author(s) |
Iver E. Anderson, Emily Rinko, Wei Tang, Matthew Kramer, Nicolas Argibay |
| On-Site Speaker (Planned) |
Iver E. Anderson |
| Abstract Scope |
Alnico rare earth-free magnets have valuable high temperature stability but lack the coercivity and energy product necessary for advanced motors/generators and actuators. Current supply/price pressure on Co motivated this work on abnormal grain growth (AGG), beneficial <001> texturing, and nano-structure alignment in Co-lean alnico. AGG was promoted by engineering a bi-modal starting powder size distribution to enable particle-assisted AGG (PA-AGG), with particles (~500 nm) from residual prior particle boundary oxides. Texturing was encouraged by imposing uniaxial compressive stress during vacuum sintering (1240C, 20h) of samples in an AGG-prone condition (90% dense) that retained grain growth driving force. Nano-structure alignment was attempted by novel tensile annealing during spinodal decomposition to enhance shape anisotropy and magnetic properties, instead of magnetic annealing. Results on grain size, texture evolution, and nanostructure will be reported, along with magnetic properties after standard magnetic annealing and draw cycles. Funded by KC-NSC through Ames Lab contract no. DE-AC02-07CH11358. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Powder Materials, Sustainability |