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

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 °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.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011 (United States)
Publication Date:
OSTI Identifier:
22410068
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM ALLOYS; ANISOTROPY; COBALT ALLOYS; COERCIVE FORCE; ENERGY DENSITY; GRAIN GROWTH; GRAIN SIZE; IRON BASE ALLOYS; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; MOLDING; NICKEL ALLOYS; PERMANENT MAGNETS; POWDERS; SINTERING

Citation Formats

Anderson, I. E., E-mail: andersoni@ameslab.gov, Kassen, A. G., White, E. M. H., Zhou, L., Tang, W., Palasyuk, A., Dennis, K. W., McCallum, R. W., and Kramer, M. J. Novel pre-alloyed powder processing of modified alnico 8: Correlation of microstructure and magnetic properties. United States: N. p., 2015. Web. doi:10.1063/1.4916996.
Anderson, I. E., E-mail: andersoni@ameslab.gov, Kassen, A. G., White, E. M. H., Zhou, L., Tang, W., Palasyuk, A., Dennis, K. W., McCallum, R. W., & Kramer, M. J. Novel pre-alloyed powder processing of modified alnico 8: Correlation of microstructure and magnetic properties. United States. doi:10.1063/1.4916996.
Anderson, I. E., E-mail: andersoni@ameslab.gov, Kassen, A. G., White, E. M. H., Zhou, L., Tang, W., Palasyuk, A., Dennis, K. W., McCallum, R. W., and Kramer, M. J. Thu . "Novel pre-alloyed powder processing of modified alnico 8: Correlation of microstructure and magnetic properties". United States. doi:10.1063/1.4916996.
@article{osti_22410068,
title = {Novel pre-alloyed powder processing of modified alnico 8: Correlation of microstructure and magnetic properties},
author = {Anderson, I. E., E-mail: andersoni@ameslab.gov and Kassen, A. G. and White, E. M. H. and Zhou, L. and Tang, W. and Palasyuk, A. and Dennis, K. W. and McCallum, R. W. and Kramer, M. J.},
abstractNote = {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. 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.},
doi = {10.1063/1.4916996},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}