New alnico magnets fabricated from pre-alloyed gas-atomized powder through diverse consolidation techniques

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

doi:10.1109/TMAG.2015.2437355

Title: New alnico magnets fabricated from pre-alloyed gas-atomized powder through diverse consolidation techniques

Abstract

Fine Alnico 8 spherical powder produced by gas atomization was consolidated through hot pressing (HP), hot isostatic pressing (HIP), and compression molding and subsequent sintering (CMS) techniques. The effects of different fabrication techniques and processing parameters on microstructure and magnetic properties were analyzed and compared. The HP, HIP, and CMS magnets exhibited different features in microstructures and magnetic properties. Magnetically annealed at 840°C for 10 min and subsequently tempered at 650°C for 5h and 580°C for 15h, the HIP sample achieved the best coercivity (H_cj =1845 Oe) due to spinodally decomposed (SD) phases with uniform and well-faceted mosaic morphology. As a result, the CMS sample had a lower Hcj than HIP and HP samples, but a higher remanence and thus the best energy product (6.5 MGOe) due to preferential grain alignment induced by abnormal grain growth.

Authors:

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

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

Publication Date:: Mon May 25 00:00:00 EDT 2015

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1234461

Report Number(s):: IS-J-8871
Journal ID: ISSN 0018-9464

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Magnetics

Additional Journal Information:: Journal Volume: 51; Journal Issue: 11; Journal ID: ISSN 0018-9464

Publisher:: Institute of Electrical and Electronics Engineers. Magnetics Group

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; alnico permanent magnets; gas atomization powder; hot pressing; magnetic properties; sintering

Citation Formats


                    Tang, W., Zhou, L., Kassen, A. G., Palasyuk, A., White, E. M., Dennis, K. W., Kramer, M. J., McCallum, R. W., and Anderson, I. E. New alnico magnets fabricated from pre-alloyed gas-atomized powder through diverse consolidation techniques.  United States: N. p., 2015. 
Web.  doi:10.1109/TMAG.2015.2437355.

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                    Tang, W., Zhou, L., Kassen, A. G., Palasyuk, A., White, E. M., Dennis, K. W., Kramer, M. J., McCallum, R. W., & Anderson, I. E. New alnico magnets fabricated from pre-alloyed gas-atomized powder through diverse consolidation techniques.  United States.  https://doi.org/10.1109/TMAG.2015.2437355

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                    Tang, W., Zhou, L., Kassen, A. G., Palasyuk, A., White, E. M., Dennis, K. W., Kramer, M. J., McCallum, R. W., and Anderson, I. E. Mon .  
"New alnico magnets fabricated from pre-alloyed gas-atomized powder through diverse consolidation techniques".  United States.  https://doi.org/10.1109/TMAG.2015.2437355.  https://www.osti.gov/servlets/purl/1234461.

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@article{osti_1234461,

  title        = {New alnico magnets fabricated from pre-alloyed gas-atomized powder through diverse consolidation techniques},

  author       = {Tang, W. and Zhou, L. and Kassen, A. G. and Palasyuk, A. and White, E. M. and Dennis, K. W. and Kramer, M. J. and McCallum, R. W. and Anderson, I. E.},

  abstractNote = {Fine Alnico 8 spherical powder produced by gas atomization was consolidated through hot pressing (HP), hot isostatic pressing (HIP), and compression molding and subsequent sintering (CMS) techniques. The effects of different fabrication techniques and processing parameters on microstructure and magnetic properties were analyzed and compared. The HP, HIP, and CMS magnets exhibited different features in microstructures and magnetic properties. Magnetically annealed at 840°C for 10 min and subsequently tempered at 650°C for 5h and 580°C for 15h, the HIP sample achieved the best coercivity (Hcj =1845 Oe) due to spinodally decomposed (SD) phases with uniform and well-faceted mosaic morphology. As a result, the CMS sample had a lower Hcj than HIP and HP samples, but a higher remanence and thus the best energy product (6.5 MGOe) due to preferential grain alignment induced by abnormal grain growth.},

  doi          = {10.1109/TMAG.2015.2437355},

  journal      = {IEEE Transactions on Magnetics},

  number       = 11,

  volume       = 51,

  place        = {United States},

  year         = {Mon May 25 00:00:00 EDT 2015},

  month        = {Mon May 25 00:00:00 EDT 2015}

}

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Works referencing / citing this record:

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

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Title: New alnico magnets fabricated from pre-alloyed gas-atomized powder through diverse consolidation techniques

Abstract

Citation Formats

Processing of Alnico Magnets by Additive Manufacturing journal, November 2019

Processing of Alnico Magnets by Additive Manufacturing
journal, November 2019