Anisotropic Nd-Fe-B nanocrystalline magnets processed by spark plasma sintering and in situ hot pressing of hydrogenation-decomposition-desorption-recombination powder

R. Gopalan; H. Sepehri-Amin; K. Suresh; T. Ohkubo; K. Hono; T. Nishiuchi; N. Nozawa; S. Hirosawa

doi:10.1016/j.scriptamat.2009.08.007

Anisotropic Nd-Fe-B nanocrystalline magnets processed by spark plasma sintering and in situ hot pressing of hydrogenation-decomposition-desorption-recombination powder

R. Gopalan, H. Sepehri-Amin, K. Suresh, T. Ohkubo, K. Hono, T. Nishiuchi, N. Nozawa, S. Hirosawa

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

37 Citations (Scopus)

Abstract

An anisotropic full density Nd-Fe-B nanocrystalline magnet was produced by spark plasma sintering of hydrogenation-decomposition-desorption-recombination processed powder and subsequent in situ hot deformation. The in situ hot deformation caused the Nd₂Fe₁₄B grains elongated normal to the applied pressure with an enhanced c-axis texture. Accordingly, the remanence (B_r) and maximum energy product were improved from 1.07 to 1.35 T and 192 to 224 kJ m^-3, respectively, with a slightly reduced coercivity (H_c) of ∼1000 kA m^-1.

Original language	English
Pages (from-to)	978-981
Number of pages	4
Journal	Scripta Materialia
Volume	61
Issue number	10
DOIs	https://doi.org/10.1016/j.scriptamat.2009.08.007
Publication status	Published - 2009 Nov
Externally published	Yes

Keywords

Coercivity
HDDR Nd-Fe-B
Microstructure
Rare earth magnets
Spark plasma sintering

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.2009.08.007

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Gopalan, R, Sepehri-Amin, H, Suresh, K, Ohkubo, T, Hono, K, Nishiuchi, T, Nozawa, N & Hirosawa, S 2009, 'Anisotropic Nd-Fe-B nanocrystalline magnets processed by spark plasma sintering and in situ hot pressing of hydrogenation-decomposition-desorption-recombination powder', Scripta Materialia, vol. 61, no. 10, pp. 978-981. https://doi.org/10.1016/j.scriptamat.2009.08.007

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title = "Anisotropic Nd-Fe-B nanocrystalline magnets processed by spark plasma sintering and in situ hot pressing of hydrogenation-decomposition-desorption-recombination powder",

abstract = "An anisotropic full density Nd-Fe-B nanocrystalline magnet was produced by spark plasma sintering of hydrogenation-decomposition-desorption-recombination processed powder and subsequent in situ hot deformation. The in situ hot deformation caused the Nd2Fe14B grains elongated normal to the applied pressure with an enhanced c-axis texture. Accordingly, the remanence (Br) and maximum energy product were improved from 1.07 to 1.35 T and 192 to 224 kJ m-3, respectively, with a slightly reduced coercivity (Hc) of ∼1000 kA m-1.",

keywords = "Coercivity, HDDR Nd-Fe-B, Microstructure, Rare earth magnets, Spark plasma sintering",

author = "R. Gopalan and H. Sepehri-Amin and K. Suresh and T. Ohkubo and K. Hono and T. Nishiuchi and N. Nozawa and S. Hirosawa",

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,” Grant-in-Aid for Scientific Research (C) 21560706 and the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan.",

year = "2009",

month = nov,

doi = "10.1016/j.scriptamat.2009.08.007",

language = "English",

volume = "61",

pages = "978--981",

journal = "Scripta Materialia",

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T1 - Anisotropic Nd-Fe-B nanocrystalline magnets processed by spark plasma sintering and in situ hot pressing of hydrogenation-decomposition-desorption-recombination powder

AU - Gopalan, R.

AU - Sepehri-Amin, H.

AU - Suresh, K.

AU - Ohkubo, T.

AU - Hono, K.

AU - Nishiuchi, T.

AU - Nozawa, N.

AU - Hirosawa, S.

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,” Grant-in-Aid for Scientific Research (C) 21560706 and the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan.

PY - 2009/11

Y1 - 2009/11

N2 - An anisotropic full density Nd-Fe-B nanocrystalline magnet was produced by spark plasma sintering of hydrogenation-decomposition-desorption-recombination processed powder and subsequent in situ hot deformation. The in situ hot deformation caused the Nd2Fe14B grains elongated normal to the applied pressure with an enhanced c-axis texture. Accordingly, the remanence (Br) and maximum energy product were improved from 1.07 to 1.35 T and 192 to 224 kJ m-3, respectively, with a slightly reduced coercivity (Hc) of ∼1000 kA m-1.

AB - An anisotropic full density Nd-Fe-B nanocrystalline magnet was produced by spark plasma sintering of hydrogenation-decomposition-desorption-recombination processed powder and subsequent in situ hot deformation. The in situ hot deformation caused the Nd2Fe14B grains elongated normal to the applied pressure with an enhanced c-axis texture. Accordingly, the remanence (Br) and maximum energy product were improved from 1.07 to 1.35 T and 192 to 224 kJ m-3, respectively, with a slightly reduced coercivity (Hc) of ∼1000 kA m-1.

KW - Coercivity

KW - HDDR Nd-Fe-B

KW - Microstructure

KW - Rare earth magnets

KW - Spark plasma sintering

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Anisotropic Nd-Fe-B nanocrystalline magnets processed by spark plasma sintering and in situ hot pressing of hydrogenation-decomposition-desorption-recombination powder

Abstract

Keywords

ASJC Scopus subject areas

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