Microstructure of fine-grained Nd-Fe-B sintered magnets with high coercivity

H. Sepehri-Amin; Y. Une; T. Ohkubo; K. Hono; M. Sagawa

doi:10.1016/j.scriptamat.2011.05.006

Microstructure of fine-grained Nd-Fe-B sintered magnets with high coercivity

H. Sepehri-Amin, Y. Une, T. Ohkubo, K. Hono, M. Sagawa

Research output: Contribution to journal › Article › peer-review

170 Citations (Scopus)

Abstract

The microstructure of high-coercivity Nd-Fe-B sintered magnets with a grain size of about 1 μm, which was processed by helium jet milling and the pressless sintering process, was studied by scanning electron microscopy, transmission electron microscopy and atom probe tomography. The high coercivity can be attributed to a similar microstructure that is five times smaller than that of conventional sintered magnets. Initial magnetization curves showed a two-step magnetization process, suggesting that the grain boundary phase causes a pinning force.

Original language	English
Pages (from-to)	396-399
Number of pages	4
Journal	Scripta Materialia
Volume	65
Issue number	5
DOIs	https://doi.org/10.1016/j.scriptamat.2011.05.006
Publication status	Published - 2011 Sept
Externally published	Yes

Keywords

Atom probe tomography
Coercivity
Grain boundary
Nd-Fe-B
Permanent magnet

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2011.05.006

Cite this

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title = "Microstructure of fine-grained Nd-Fe-B sintered magnets with high coercivity",

abstract = "The microstructure of high-coercivity Nd-Fe-B sintered magnets with a grain size of about 1 μm, which was processed by helium jet milling and the pressless sintering process, was studied by scanning electron microscopy, transmission electron microscopy and atom probe tomography. The high coercivity can be attributed to a similar microstructure that is five times smaller than that of conventional sintered magnets. Initial magnetization curves showed a two-step magnetization process, suggesting that the grain boundary phase causes a pinning force.",

keywords = "Atom probe tomography, Coercivity, Grain boundary, Nd-Fe-B, Permanent magnet",

author = "H. Sepehri-Amin and Y. Une and T. Ohkubo and K. Hono and M. Sagawa",

note = "Funding Information: This work was supported by the Rare Metal Substitute Materials Development Project on the development of technology for reducing dysprosium usage in a rare-earth magnet, NEDO and CREST-JST . H.S.-A. acknowledges the NIMS for the provision of a NIMS Junior Research Assistantship. ",

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doi = "10.1016/j.scriptamat.2011.05.006",

language = "English",

volume = "65",

pages = "396--399",

journal = "Scripta Materialia",

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T1 - Microstructure of fine-grained Nd-Fe-B sintered magnets with high coercivity

AU - Sepehri-Amin, H.

AU - Une, Y.

AU - Ohkubo, T.

AU - Hono, K.

AU - Sagawa, M.

N1 - Funding Information: This work was supported by the Rare Metal Substitute Materials Development Project on the development of technology for reducing dysprosium usage in a rare-earth magnet, NEDO and CREST-JST . H.S.-A. acknowledges the NIMS for the provision of a NIMS Junior Research Assistantship.

PY - 2011/9

Y1 - 2011/9

N2 - The microstructure of high-coercivity Nd-Fe-B sintered magnets with a grain size of about 1 μm, which was processed by helium jet milling and the pressless sintering process, was studied by scanning electron microscopy, transmission electron microscopy and atom probe tomography. The high coercivity can be attributed to a similar microstructure that is five times smaller than that of conventional sintered magnets. Initial magnetization curves showed a two-step magnetization process, suggesting that the grain boundary phase causes a pinning force.

AB - The microstructure of high-coercivity Nd-Fe-B sintered magnets with a grain size of about 1 μm, which was processed by helium jet milling and the pressless sintering process, was studied by scanning electron microscopy, transmission electron microscopy and atom probe tomography. The high coercivity can be attributed to a similar microstructure that is five times smaller than that of conventional sintered magnets. Initial magnetization curves showed a two-step magnetization process, suggesting that the grain boundary phase causes a pinning force.

KW - Atom probe tomography

KW - Coercivity

KW - Grain boundary

KW - Nd-Fe-B

KW - Permanent magnet

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DO - 10.1016/j.scriptamat.2011.05.006

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JO - Scripta Materialia

JF - Scripta Materialia

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Microstructure of fine-grained Nd-Fe-B sintered magnets with high coercivity

Abstract

Keywords

ASJC Scopus subject areas

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