Effect of Ga addition on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powder

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

doi:10.1016/j.actamat.2009.10.035

Effect of Ga addition on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powder

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

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

60 Citations (Scopus)

Abstract

Microstructural evolution of hydrogenation-disproportionation-desorption-recombination processed Nd_12.5Fe_72.8Co_8.0B_6.5Ga_0.2 powder has been investigated in relation to coercivity development during the desorption recombination process. Coercivity increases when residual NdH₂ is completely dehydrogenated and the decomposed Nd is segregated at the grain boundaries of the Nd₂Fe₁₄B phase. Three-dimensional atom probe (3DAP) analysis indicates the segregation of Ga at the grain boundary. The reason for the enhancement of the coercivity by the trace addition Ga is discussed based on the 3DAP results.

Original language	English
Pages (from-to)	1309-1316
Number of pages	8
Journal	Acta Materialia
Volume	58
Issue number	4
DOIs	https://doi.org/10.1016/j.actamat.2009.10.035
Publication status	Published - 2010 Feb
Externally published	Yes

Keywords

Atom probe tomography
Coercivity
HDDR
Nd-Fe-B
Permanent magnets

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2009.10.035

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title = "Effect of Ga addition on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powder",

abstract = "Microstructural evolution of hydrogenation-disproportionation-desorption-recombination processed Nd12.5Fe72.8Co8.0B6.5Ga0.2 powder has been investigated in relation to coercivity development during the desorption recombination process. Coercivity increases when residual NdH2 is completely dehydrogenated and the decomposed Nd is segregated at the grain boundaries of the Nd2Fe14B phase. Three-dimensional atom probe (3DAP) analysis indicates the segregation of Ga at the grain boundary. The reason for the enhancement of the coercivity by the trace addition Ga is discussed based on the 3DAP results.",

keywords = "Atom probe tomography, Coercivity, HDDR, Nd-Fe-B, Permanent magnets",

author = "H. Sepehri-Amin and Li, {W. F.} and T. Ohkubo and T. Nishiuchi and S. Hirosawa and K. Hono",

note = "Funding Information: This work was supported by MEXT{\textquoteright}s Elements Science and Technology Project for “High Performance Anisotropic Nanocomposite Permanent Magnets with Low Rare-Earth Content”, CREST-JST, and the World Premier International (WPI) Research Center Initiative on Materials Nanoarchitronics, MEXT, Japan. ",

year = "2010",

month = feb,

doi = "10.1016/j.actamat.2009.10.035",

language = "English",

volume = "58",

pages = "1309--1316",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Effect of Ga addition on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powder

AU - Sepehri-Amin, H.

AU - Li, W. F.

AU - Ohkubo, T.

AU - Nishiuchi, T.

AU - Hirosawa, S.

AU - Hono, K.

N1 - Funding Information: This work was supported by MEXT’s Elements Science and Technology Project for “High Performance Anisotropic Nanocomposite Permanent Magnets with Low Rare-Earth Content”, CREST-JST, and the World Premier International (WPI) Research Center Initiative on Materials Nanoarchitronics, MEXT, Japan.

PY - 2010/2

Y1 - 2010/2

N2 - Microstructural evolution of hydrogenation-disproportionation-desorption-recombination processed Nd12.5Fe72.8Co8.0B6.5Ga0.2 powder has been investigated in relation to coercivity development during the desorption recombination process. Coercivity increases when residual NdH2 is completely dehydrogenated and the decomposed Nd is segregated at the grain boundaries of the Nd2Fe14B phase. Three-dimensional atom probe (3DAP) analysis indicates the segregation of Ga at the grain boundary. The reason for the enhancement of the coercivity by the trace addition Ga is discussed based on the 3DAP results.

AB - Microstructural evolution of hydrogenation-disproportionation-desorption-recombination processed Nd12.5Fe72.8Co8.0B6.5Ga0.2 powder has been investigated in relation to coercivity development during the desorption recombination process. Coercivity increases when residual NdH2 is completely dehydrogenated and the decomposed Nd is segregated at the grain boundaries of the Nd2Fe14B phase. Three-dimensional atom probe (3DAP) analysis indicates the segregation of Ga at the grain boundary. The reason for the enhancement of the coercivity by the trace addition Ga is discussed based on the 3DAP results.

KW - Atom probe tomography

KW - Coercivity

KW - HDDR

KW - Nd-Fe-B

KW - Permanent magnets

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U2 - 10.1016/j.actamat.2009.10.035

DO - 10.1016/j.actamat.2009.10.035

M3 - Article

AN - SCOPUS:72549101227

SN - 1359-6454

VL - 58

SP - 1309

EP - 1316

JO - Acta Materialia

JF - Acta Materialia

IS - 4

ER -

Effect of Ga addition on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powder

Abstract

Keywords

ASJC Scopus subject areas

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