Microstructure of high coercivity Nd-Fe-Co-Ga-B hot-deformed magnet improved by the Dy diffusion treatment

研究成果: ジャーナルへの寄稿記事

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抄録

Microstructure of Nd-Fe-Co-Ga-B hot-deformed magnet improved by the Dy diffusion treatment was investigated with high-resolution scanning electron microscopy (HRSEM), analytical transmission electron microscopy (ATEM) and high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). It was found that Dy diffuses along the thin grain boundary (GB) phase between Nd2(Fe,Co)14B grains, and then the Dy substitutes for a part of Nd near the surface of the Nd2(Fe,Co)14B grains. Consequently, two-layered-wrapping structure of thin GB phase and thin (Nd,Dy)2(Fe,Co)14B layer is formed on each Nd 2(Fe,Co)14B grain. Moreover, the Dy substitution occurs preferentially at the Nd-sites of a-planes compared with that of c-planes in the Nd2(Fe,Co)14B grains. These results indicate that the Dy diffusion treatment improves significantly the coercivity by forming the thin (Nd,Dy)2(Fe,Co)14B layer on the surface of Nd 2(Fe,Co)14B grains, although the treatment leads to grain growth and deterioration of the c-axis alignment of Nd2(Fe,Co) 14B grains.

元の言語英語
ページ(範囲)1-4
ページ数4
ジャーナルJournal of Alloys and Compounds
557
DOI
出版物ステータス出版済み - 4 25 2013

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Coercive force
Magnets
Microstructure
Grain boundaries
Transmission electron microscopy
Scanning electron microscopy
High resolution electron microscopy
Grain growth
Deterioration
Substitution reactions

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

これを引用

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title = "Microstructure of high coercivity Nd-Fe-Co-Ga-B hot-deformed magnet improved by the Dy diffusion treatment",
abstract = "Microstructure of Nd-Fe-Co-Ga-B hot-deformed magnet improved by the Dy diffusion treatment was investigated with high-resolution scanning electron microscopy (HRSEM), analytical transmission electron microscopy (ATEM) and high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). It was found that Dy diffuses along the thin grain boundary (GB) phase between Nd2(Fe,Co)14B grains, and then the Dy substitutes for a part of Nd near the surface of the Nd2(Fe,Co)14B grains. Consequently, two-layered-wrapping structure of thin GB phase and thin (Nd,Dy)2(Fe,Co)14B layer is formed on each Nd 2(Fe,Co)14B grain. Moreover, the Dy substitution occurs preferentially at the Nd-sites of a-planes compared with that of c-planes in the Nd2(Fe,Co)14B grains. These results indicate that the Dy diffusion treatment improves significantly the coercivity by forming the thin (Nd,Dy)2(Fe,Co)14B layer on the surface of Nd 2(Fe,Co)14B grains, although the treatment leads to grain growth and deterioration of the c-axis alignment of Nd2(Fe,Co) 14B grains.",
author = "N. Watanabe and Masaru Itakura and Minoru Nishida",
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T1 - Microstructure of high coercivity Nd-Fe-Co-Ga-B hot-deformed magnet improved by the Dy diffusion treatment

AU - Watanabe, N.

AU - Itakura, Masaru

AU - Nishida, Minoru

PY - 2013/4/25

Y1 - 2013/4/25

N2 - Microstructure of Nd-Fe-Co-Ga-B hot-deformed magnet improved by the Dy diffusion treatment was investigated with high-resolution scanning electron microscopy (HRSEM), analytical transmission electron microscopy (ATEM) and high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). It was found that Dy diffuses along the thin grain boundary (GB) phase between Nd2(Fe,Co)14B grains, and then the Dy substitutes for a part of Nd near the surface of the Nd2(Fe,Co)14B grains. Consequently, two-layered-wrapping structure of thin GB phase and thin (Nd,Dy)2(Fe,Co)14B layer is formed on each Nd 2(Fe,Co)14B grain. Moreover, the Dy substitution occurs preferentially at the Nd-sites of a-planes compared with that of c-planes in the Nd2(Fe,Co)14B grains. These results indicate that the Dy diffusion treatment improves significantly the coercivity by forming the thin (Nd,Dy)2(Fe,Co)14B layer on the surface of Nd 2(Fe,Co)14B grains, although the treatment leads to grain growth and deterioration of the c-axis alignment of Nd2(Fe,Co) 14B grains.

AB - Microstructure of Nd-Fe-Co-Ga-B hot-deformed magnet improved by the Dy diffusion treatment was investigated with high-resolution scanning electron microscopy (HRSEM), analytical transmission electron microscopy (ATEM) and high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). It was found that Dy diffuses along the thin grain boundary (GB) phase between Nd2(Fe,Co)14B grains, and then the Dy substitutes for a part of Nd near the surface of the Nd2(Fe,Co)14B grains. Consequently, two-layered-wrapping structure of thin GB phase and thin (Nd,Dy)2(Fe,Co)14B layer is formed on each Nd 2(Fe,Co)14B grain. Moreover, the Dy substitution occurs preferentially at the Nd-sites of a-planes compared with that of c-planes in the Nd2(Fe,Co)14B grains. These results indicate that the Dy diffusion treatment improves significantly the coercivity by forming the thin (Nd,Dy)2(Fe,Co)14B layer on the surface of Nd 2(Fe,Co)14B grains, although the treatment leads to grain growth and deterioration of the c-axis alignment of Nd2(Fe,Co) 14B grains.

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