Magnetic field control of microstructural development in melt-spun Pr2Co14B

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.

doi:10.1016/j.jmmm.2016.12.101

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

Journal Article · Fri Jan 27 00:00:00 EST 2017 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2016.12.101· OSTI ID:1350926

McGuire, Michael A. ^[1]; Rios, Orlando ^[1]; Conner, Ben S. ^[1]; Carter, William G. ^[1]; Huang, Mianliang ^[2]; Sun, Kewei ^[2]; Palasyuk, Olena ^[2]; Jensen, Brandt ^[2]; Zhou, Lin ^[2]; Dennis, Kevin ^[2]; Nlebedim, Ikenna Cajetan ^[2]; Kramer, Matthew J. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ames Lab., Ames, IA (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Critical Materials Institute (CMI)

Sponsoring Organization:: Work for Others (WFO); USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1350926

Alternate ID(s):: OSTI ID: 1412026

Journal Information:: Journal of Magnetism and Magnetic Materials, Vol. 430, Issue C; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Effects of High Magnetic Fields on Phase Transformations in Amorphous Nd2Fe14B Kesler, Michael; Jensen, Brandt; Zhou, Lin Magnetochemistry, Vol. 5, Issue 1 https://doi.org/10.3390/magnetochemistry5010016	journal	March 2019

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