About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Magnetics and the Critical Materials Challenge: An FMD Symposium Honoring Matthew J. Kramer
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Presentation Title |
Utilizing High Energy X-rays to Perform In Situ observations of Alnico Spinodal Evolution |
Author(s) |
Emily Anne Rinko, Matthew J. Kramer, Iver E. Anderson |
On-Site Speaker (Planned) |
Emily Anne Rinko |
Abstract Scope |
Rare earth (RE) free alnico permanent magnet (PM) alloys undergo spinodal decomposition of a solid solution B2 (BCC) phase to Fe-Co (α1), and Ni-Al-rich (α2) phases. As alnico’s coercivity largely relies on shape anisotropy, the distribution, size, and geometry of the resulting α1 impacts coercivity, which is too low for alnico to be an alternative to RE-PMs. Utilizing high energy X-rays with high time resolution (sub-second) small and wide-angle diffraction at different isothermal regions within the spinodal in controlled atmosphere, the evolution of the spinodal was studied in alnico alloys, one close to commercial alnico 8H and two others designed for higher coercivity. These observations helped provide improved understanding on how processing parameters impact the evolution of alnico’s spinodal and eventually can allow process optimization to promote maximum coercivity and energy product in alnico PMs. Funded by USDOE-OTT-TCF with EERE-VTO support and by KC-NSC through Ames Lab contract no. DE-AC02-07CH11358. |
Proceedings Inclusion? |
Planned: |
Keywords |
Magnetic Materials, Characterization, Powder Materials |