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Title: Magnetic field control of microstructural development in melt-spun Pr 2 Co 14 B

Abstract

In the processing of commercial rare earth permanent magnets, use of external magnetic fields is limited mainly to the alignment of anisotropic particles and the polarization of the finished magnets. Here we explore the effects of high magnetic fields on earlier stages of magnet synthesis, including the crystallization and chemical phase transformations that produce the 2:14:1 phase in the Pr-Co-B system. Pr2Co14B alloys produced by melt-spinning were annealed in the presence of strong applied magnetic fields (H=90 kOe). The resulting materials were characterized by x-ray diffraction, electron microscopy, and magnetization measurements. We find that magnetic fields suppress the nucleation and growth of crystalline phases, resulting in significantly smaller particle sizes. In addition, magnetic fields applied during processing strongly affects chemical phase selection, suppressing the formation of Pr2Co14B and α-Co in favor of Pr2Co17. Here, the results demonstrate that increased control over key microstructural properties is achievable by including a strong magnetic field as a processing parameter for rare-earth magnet materials.

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Ames Lab., Ames, IA (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Critical Materials Institute (CMI)
Sponsoring Org.:
Work for Others (WFO); USDOE
OSTI Identifier:
1350926
Alternate Identifier(s):
OSTI ID: 1412026
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 430; Journal Issue: C; Journal ID: ISSN 0304-8853
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

McGuire, Michael A., Rios, Orlando, Conner, Ben S., Carter, William G., Huang, Mianliang, Sun, Kewei, Palasyuk, Olena, Jensen, Brandt, Zhou, Lin, Dennis, Kevin, Nlebedim, Ikenna Cajetan, and Kramer, Matthew J. Magnetic field control of microstructural development in melt-spun Pr2Co14B. United States: N. p., 2017. Web. doi:10.1016/j.jmmm.2016.12.101.
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McGuire, Michael A., Rios, Orlando, Conner, Ben S., Carter, William G., Huang, Mianliang, Sun, Kewei, Palasyuk, Olena, Jensen, Brandt, Zhou, Lin, Dennis, Kevin, Nlebedim, Ikenna Cajetan, & Kramer, Matthew J. Magnetic field control of microstructural development in melt-spun Pr2Co14B. United States. https://doi.org/10.1016/j.jmmm.2016.12.101
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McGuire, Michael A., Rios, Orlando, Conner, Ben S., Carter, William G., Huang, Mianliang, Sun, Kewei, Palasyuk, Olena, Jensen, Brandt, Zhou, Lin, Dennis, Kevin, Nlebedim, Ikenna Cajetan, and Kramer, Matthew J. Fri . "Magnetic field control of microstructural development in melt-spun Pr2Co14B". United States. https://doi.org/10.1016/j.jmmm.2016.12.101. https://www.osti.gov/servlets/purl/1350926.
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@article{osti_1350926,
title = {Magnetic field control of microstructural development in melt-spun Pr2Co14B},
author = {McGuire, Michael A. and Rios, Orlando and Conner, Ben S. and Carter, William G. and Huang, Mianliang and Sun, Kewei and Palasyuk, Olena and Jensen, Brandt and Zhou, Lin and Dennis, Kevin and Nlebedim, Ikenna Cajetan and Kramer, Matthew J.},
abstractNote = {In the processing of commercial rare earth permanent magnets, use of external magnetic fields is limited mainly to the alignment of anisotropic particles and the polarization of the finished magnets. Here we explore the effects of high magnetic fields on earlier stages of magnet synthesis, including the crystallization and chemical phase transformations that produce the 2:14:1 phase in the Pr-Co-B system. Pr2Co14B alloys produced by melt-spinning were annealed in the presence of strong applied magnetic fields (H=90 kOe). The resulting materials were characterized by x-ray diffraction, electron microscopy, and magnetization measurements. We find that magnetic fields suppress the nucleation and growth of crystalline phases, resulting in significantly smaller particle sizes. In addition, magnetic fields applied during processing strongly affects chemical phase selection, suppressing the formation of Pr2Co14B and α-Co in favor of Pr2Co17. Here, the results demonstrate that increased control over key microstructural properties is achievable by including a strong magnetic field as a processing parameter for rare-earth magnet materials.},
doi = {10.1016/j.jmmm.2016.12.101},
journal = {Journal of Magnetism and Magnetic Materials},
number = C,
volume = 430,
place = {United States},
year = {Fri Jan 27 00:00:00 EST 2017},
month = {Fri Jan 27 00:00:00 EST 2017}
}
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https://doi.org/10.1016/j.jmmm.2016.12.101
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    Works referencing / citing this record:

    Effects of High Magnetic Fields on Phase Transformations in Amorphous Nd2Fe14B
    journal, March 2019

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