Coercivity enhancement of hydrogenation-disproportionation-desorption- recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys

H. Sepehri-Amin; T. Ohkubo; T. Nishiuchi; S. Hirosawa; K. Hono

doi:10.1016/j.scriptamat.2010.08.021

Coercivity enhancement of hydrogenation-disproportionation-desorption- recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys

H. Sepehri-Amin, T. Ohkubo, T. Nishiuchi, S. Hirosawa, K. Hono

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

210 Citations (Scopus)

Abstract

We report the coercivity enhancement of hydrogenation-disproportionation- desorption-recombination processed Nd-Fe-B nanocrystalline powders from 1321 to 1552 kA m^-1 (19.5 kOe) by the grain boundary diffusion of Nd-Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase was observed after the diffusion process by scanning electron microscopy and transmission electron microscopy; however, atom probe tomography indicated that the change in composition of the grain boundary phase was not significant. The mechanism of the coercivity enhancement is discussed based on these results.

Original language	English
Pages (from-to)	1124-1127
Number of pages	4
Journal	Scripta Materialia
Volume	63
Issue number	11
DOIs	https://doi.org/10.1016/j.scriptamat.2010.08.021
Publication status	Published - 2010 Nov
Externally published	Yes

Keywords

Coercivity
Diffusion process
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.2010.08.021

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title = "Coercivity enhancement of hydrogenation-disproportionation-desorption- recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys",

abstract = "We report the coercivity enhancement of hydrogenation-disproportionation- desorption-recombination processed Nd-Fe-B nanocrystalline powders from 1321 to 1552 kA m-1 (19.5 kOe) by the grain boundary diffusion of Nd-Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase was observed after the diffusion process by scanning electron microscopy and transmission electron microscopy; however, atom probe tomography indicated that the change in composition of the grain boundary phase was not significant. The mechanism of the coercivity enhancement is discussed based on these results.",

keywords = "Coercivity, Diffusion process, Nd-Fe-B, Permanent magnet",

author = "H. Sepehri-Amin and T. Ohkubo and T. Nishiuchi and S. Hirosawa and K. Hono",

note = "Funding Information: {\textquoteright} Contribution No. 1068 from the McCollum-Pratt Institute, The Johns Hopkins University. These studies were supported by Grants DEB7619877 and DEB79-12216 from the National Science Foundation, by Grants NIEHS ES 01527 and GM-18254 from the National Institutes of Health, and contract EY-76-S-02-2965 from the Department of Energy. * Present address: Department of Biochemistry, Brandeis University, Waltham, Mass. 02154.",

year = "2010",

month = nov,

doi = "10.1016/j.scriptamat.2010.08.021",

language = "English",

volume = "63",

pages = "1124--1127",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

number = "11",

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TY - JOUR

T1 - Coercivity enhancement of hydrogenation-disproportionation-desorption- recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys

AU - Sepehri-Amin, H.

AU - Ohkubo, T.

AU - Nishiuchi, T.

AU - Hirosawa, S.

AU - Hono, K.

N1 - Funding Information: ’ Contribution No. 1068 from the McCollum-Pratt Institute, The Johns Hopkins University. These studies were supported by Grants DEB7619877 and DEB79-12216 from the National Science Foundation, by Grants NIEHS ES 01527 and GM-18254 from the National Institutes of Health, and contract EY-76-S-02-2965 from the Department of Energy. * Present address: Department of Biochemistry, Brandeis University, Waltham, Mass. 02154.

PY - 2010/11

Y1 - 2010/11

N2 - We report the coercivity enhancement of hydrogenation-disproportionation- desorption-recombination processed Nd-Fe-B nanocrystalline powders from 1321 to 1552 kA m-1 (19.5 kOe) by the grain boundary diffusion of Nd-Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase was observed after the diffusion process by scanning electron microscopy and transmission electron microscopy; however, atom probe tomography indicated that the change in composition of the grain boundary phase was not significant. The mechanism of the coercivity enhancement is discussed based on these results.

AB - We report the coercivity enhancement of hydrogenation-disproportionation- desorption-recombination processed Nd-Fe-B nanocrystalline powders from 1321 to 1552 kA m-1 (19.5 kOe) by the grain boundary diffusion of Nd-Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase was observed after the diffusion process by scanning electron microscopy and transmission electron microscopy; however, atom probe tomography indicated that the change in composition of the grain boundary phase was not significant. The mechanism of the coercivity enhancement is discussed based on these results.

KW - Coercivity

KW - Diffusion process

KW - Nd-Fe-B

KW - Permanent magnet

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DO - 10.1016/j.scriptamat.2010.08.021

M3 - Article

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SN - 1359-6462

VL - 63

SP - 1124

EP - 1127

JO - Scripta Materialia

JF - Scripta Materialia

IS - 11

ER -

Coercivity enhancement of hydrogenation-disproportionation-desorption- recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys

Abstract

Keywords

ASJC Scopus subject areas

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