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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 (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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Iowa State Univ., Ames, IA (United States)
Publication Date:
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. https://doi.org/10.1109/TMAG.2015.2437355.
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
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.
@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 = {2015},
month = {5}
}

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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