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

Journal Article · Mon Apr 13 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4916996· OSTI ID:1225377

Anderson, I. E.  ^[1]; Kassen, A. G.  ^[1]; White, E. M. H. ^[1]; Zhou, L. ^[1]; Tang, W. ^[1]; Palasyuk, A. ^[1]; Dennis, K. W. ^[1]; McCallum, R. W. ^[1]; Kramer, M. J. ^[1]

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1. Ames Lab. and Iowa State Univ., Ames, IA (United States)

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°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. Furthermore, 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.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1225377
• Report Number(s): IS-J-8494; JAPIAU
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; ISSN 0021-8979
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
sintering
magnets
coercive force
permanent magnets
nanopowders