About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Magnetic Materials for Energy and Power Conversion Applications
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Presentation Title |
Development of Enhanced Magnetic and Mechanical Properties of Alnico as a Rare Earth-free Permanent Magnet by Final-shape Powder Processing |
Author(s) |
Iver E. Anderson, Emily Anne Rinko, Emma M.H. White, Aaron G. Kassen, Wei Tang, Lin Zhou, Timothy Prost, Matthew J. Kramer |
On-Site Speaker (Planned) |
Iver E. Anderson |
Abstract Scope |
A lack of useful coercivity in alnico (Al-Ni-Co-Fe) magnets currently limits application in automotive traction drive motors, despite high temperature stability. Using enhanced alnico magnets to replace rare earth magnets, can decrease motor cooling needs and increase the motor’s efficiency. Conventional alnico magnet production involves directionally-solidified casting into special chill molds (high-cost/limited production) to achieve good second quadrant squareness, but insufficient coercivity limits their energy product at 180˚C to about 50% of Nd-Dy-Fe-B magnets for existing traction drives. Alternatively, full density pre-alloyed powder processed alnico magnets are mass production capable with increased coercivity, but have so-far achieved reduced energy products as isotropic fine-grained magnets, insufficient for drive motors. However, current results have shown that aligned microstructures with enhanced properties are accessible in alnico magnets by novel approaches during final shaping by compression molding and stress-biased secondary sintering. Funded by USDOE-EERE-VT-EDT program and USDOE-OTT-TCF program through Ames Lab contract no. DE-AC02-07CH11358. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |