Novel mechanisms for solid-state processing and grain growth with microstructure alignment in alnico-8 based permanent magnets

dc.contributor.author Kassen, Aaron
dc.contributor.author White, Emma
dc.contributor.author Hu, Liangfa
dc.contributor.author Tang, Wei
dc.contributor.author Zhou, Lin
dc.contributor.author Kramer, Matthew
dc.contributor.author Anderson, Iver
dc.contributor.department Ames Laboratory
dc.contributor.department Materials Science and Engineering
dc.date 2018-04-28T10:25:10.000
dc.date.accessioned 2020-06-29T23:20:52Z
dc.date.available 2020-06-29T23:20:52Z
dc.date.issued 2018-01-01
dc.description.abstract <p>An estimated 750,000 new hybrid electric and plug-in battery vehicles, most with permanent magnet synchronous alternating current (PMAC) drive motors, took to the road in 2016 alone. Accompanied by 40% year over year growth in the EV market significant challenges exist in producing large quantities of permanent magnets (on the order of tens of millions) for reliable, low-cost traction motors [IE Agency, Energy Technology Perspectives (2017)]. Since the rare earth permanent magnet (REPM) market is essentially 100% net import reliant in the United States and has proven to have an unstable cost and supply structure in recent years, a replacement RE-free PM material must be designed or selected, fully developed, and implemented. Alnico, with its high saturation magnetization and excellent thermal stability, appears to be uniquely suited for this task. Further, while alnico typically has been considered a relatively low coercivity hard magnet, strides have been made to increase the coercivity to levels suitable for traction drive motors [W Tang, IEEE Trans. Magn., 51 (2015)]. If a simple non-cast approach for achieving near [001] easy axis grain aligned permanent magnets can be found, this would allow mass-produced final-shape anisotropic high energy product magnets suitable for usage in compact high RPM rotor designs. Therefore, a powder metallurgical approach is being explored that uses classic compression molding with “de-bind and sinter” methods, where a novel applied uniaxial loading, and an applied magnetic field may create final-shape magnets with highly textured resulting microstructures by two different mechanisms. Results indicate a positive correlation between applied uniaxial load and resulting texture (Fig. 1), along with benefits from using an applied magnetic field for improved texture, as well. The apparent mechanisms and resulting properties will be described using closed loop hysteresisgraph measurements, EBSD orientation mapping, and high-resolution SEM.</p>
dc.identifier archive/lib.dr.iastate.edu/ameslab_manuscripts/143/
dc.identifier.articleid 1147
dc.identifier.contextkey 11998815
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/143
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/7061
dc.language.iso en
dc.relation.ispartofseries IS-J 9627
dc.source.bitstream archive/lib.dr.iastate.edu/ameslab_manuscripts/143/IS_J_9627.pdf|||Fri Jan 14 20:18:07 UTC 2022
dc.source.uri 10.1063/1.5007850
dc.subject.disciplines Condensed Matter Physics
dc.subject.disciplines Engineering Physics
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Metallurgy
dc.subject.keywords Condensed matter properties
dc.subject.keywords Crystallography
dc.subject.keywords Amorphous metals
dc.subject.keywords Magnetic materials
dc.subject.keywords Thermodynamic processes
dc.subject.keywords Batteries
dc.subject.keywords Materials forming
dc.subject.keywords Sintering
dc.subject.keywords Electric currents
dc.title Novel mechanisms for solid-state processing and grain growth with microstructure alignment in alnico-8 based permanent magnets
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
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