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

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

doi:10.1063/1.4916996

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. 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.

Authors:

^[1];

^[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]

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

Publication Date:: Mon Apr 13 00:00:00 EDT 2015

Research Org.:: Ames Lab., Ames, IA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1225377

Report Number(s):: IS-J-8494
Journal ID: ISSN 0021-8979; JAPIAU

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 117; Journal Issue: 17; Journal ID: ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; sintering; magnets; coercive force; permanent magnets; nanopowders

Citation Formats


                    Anderson, I. E., 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.

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                    Anderson, I. E., 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.  https://doi.org/10.1063/1.4916996

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                    Anderson, I. E., Kassen, A. G., White, E. M. H., Zhou, L., Tang, W., Palasyuk, A., Dennis, K. W., McCallum, R. W., and Kramer, M. J. Mon .  
"Novel pre-alloyed powder processing of modified alnico 8: Correlation of microstructure and magnetic properties".  United States.  https://doi.org/10.1063/1.4916996.  https://www.osti.gov/servlets/purl/1225377.

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@article{osti_1225377,

  title        = {Novel pre-alloyed powder processing of modified alnico 8: Correlation of microstructure and magnetic properties},

  author       = {Anderson, I. E. 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. 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.},

  doi          = {10.1063/1.4916996},

  journal      = {Journal of Applied Physics},

  number       = 17,

  volume       = 117,

  place        = {United States},

  year         = {Mon Apr 13 00:00:00 EDT 2015},

  month        = {Mon Apr 13 00:00:00 EDT 2015}

}

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Works referenced in this record:

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators
journal, June 2012

Kramer, M. J.; McCallum, R. W.; Anderson, I. A.
JOM, Vol. 64, Issue 7
DOI: 10.1007/s11837-012-0351-z

Architecture and magnetism of alnico
journal, August 2014

Zhou, Lin; Miller, M. K.; Lu, Ping
Acta Materialia, Vol. 74
DOI: 10.1016/j.actamat.2014.04.044

Role of the Applied Magnetic Field on the Microstructural Evolution in Alnico 8 Alloys
journal, January 2014

Zhou, Lin; Miller, M. K.; Dillon, H.
Metallurgical and Materials Transactions E, Vol. 1, Issue 1
DOI: 10.1007/s40553-013-0004-3

Magnetic Aging of Spinodal Alloys
journal, December 1963

Cahn, John W.
Journal of Applied Physics, Vol. 34, Issue 12
DOI: 10.1063/1.1729261

Highly tuned gas atomization for controlled preparation of coarse powder. Hochleistungsgasverdüsung für die gezielte Präparation grober Pulver
journal, July 2010

Anderson, I. E.; Byrd, D.; Meyer, J.
Materialwissenschaft und Werkstofftechnik, Vol. 41, Issue 7, p. 504-512
DOI: 10.1002/mawe.201000636

Works referencing / citing this record:

Fabrication and Characterization of a Magnetic Drilling Actuator for Navigation in a Three-dimensional Phantom Vascular Network
journal, February 2018

Lee, Sunkey; Lee, Seungmin; Kim, Sangwon
Scientific Reports, Vol. 8, Issue 1
DOI: 10.1038/s41598-018-22110-5

Processing of Alnico Magnets by Additive Manufacturing
journal, November 2019

White, Emma; Rinko, Emily; Prost, Timothy
Applied Sciences, Vol. 9, Issue 22
DOI: 10.3390/app9224843

Fabrication and Characterization of a Magnetic Drilling Actuator for Navigation in a Three-dimensional Phantom Vascular Network
text, January 2018

Lee, Sunkey; Lee, Seungmin; Kim, Sangwon
ETH Zurich
DOI: 10.3929/ethz-b-000249960

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

Abstract

Citation Formats

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