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Novel pre-alloyed powder processing of modified alnico 8: Correlation of microstructure and magnetic properties

TitleNovel pre-alloyed powder processing of modified alnico 8: Correlation of microstructure and magnetic properties
Publication TypeJournal Article
Year of Publication2015
AuthorsAnderson, IE, Kassen, AG, White, EMH, Zhou, L, Tang, W, Palasyuk, A, Dennis, KW, McCallum, RW, Kramer, MJ
JournalJournal of Applied Physics
Volume117
Pagination17d138
Date Published05
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberWOS:000354984100361
Abstract

Progress is reviewed on development of an improved near-final bulk magnet fabrication process for alnico 8, as a non-rare earth permanent magnet with promise for sufficient energy density and coercivity for electric drive motors. This study showed that alnico bulk magnets in near-final shape can be made by simple compression molding from spherical high purity gas atomized pre-alloyed powder. Dwell time at peak sintering temperature (1250 degrees C) greatly affected grain size of the resulting magnet alloys. This microstructure transformation was demonstrated to be useful for gaining partially aligned magnetic properties and boosting energy product. While a route to increased coercivity was not identified by these experiments, manufacturability of bulk alnico magnet alloys in near-final shapes was demonstrated, permitting further processing and alloy modification experiments that can target higher coercivity and better control of grain anisotropy during grain growth. (C) 2015 AIP Publishing LLC.

DOI10.1063/1.4916996
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