Improved energy product in grained aligned and sintered MRE2 Fe14 B magnets (MRE=Y+Dy+Nd)

W. Tang; Y. Q. Wu; N. T. Oster; K. W. Dennis; M. J. Kramer; I. E. Anderson; R. W. McCallum

doi:10.1063/1.3347786

Improved energy product in grained aligned and sintered MRE₂ Fe14 B magnets (MRE=Y+Dy+Nd)

W. Tang, Y. Q. Wu, N. T. Oster, K. W. Dennis, M. J. Kramer, I. E. Anderson, R. W. McCallum

Research and Economic Development

Ames Laboratory

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

17 Scopus citations

Abstract

Sintered [Nd0.45 (Y₃ Dy₁) 0.25 0.55] 2.8 Fe14 B magnets were prepared for the first time. Magnetic properties and microstructures of the magnets were investigated by magnetic measurements and electron microprobe analysis. The microstructure consists of a MRE₂ Fe14 B (2-14-1) phase matrix having a grain size of ∼10μm and a RE-rich grain boundary phase. However, sintering resulted in segregation of Y to the inner and Nd to the outside of the 2-14-1 grains. The magnet has a room temperature (BH) max of 25.4 MGOe, which is two times higher than that of the isotropic melt spun ribbons with similar compositions. The temperature coefficients of Br (α) and Hcj (Β) for the magnet are -0.150 and -0.632%/°C from 27 to 127 °C, respectively. These temperature coefficients, especially for Β, are also much higher than those of melt spun ribbons. The composition segregation in the 2-14-1 grains is believed to be responsible for the higher temperature coefficients.

Original language	English
Article number	09A728
Journal	Journal of Applied Physics
Volume	107
Issue number	9
DOIs	https://doi.org/10.1063/1.3347786
State	Published - 1 May 2010

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title = "Improved energy product in grained aligned and sintered MRE2 Fe14 B magnets (MRE=Y+Dy+Nd)",

abstract = "Sintered [Nd0.45 (Y3 Dy1) 0.25 0.55] 2.8 Fe14 B magnets were prepared for the first time. Magnetic properties and microstructures of the magnets were investigated by magnetic measurements and electron microprobe analysis. The microstructure consists of a MRE2 Fe14 B (2-14-1) phase matrix having a grain size of ∼10μm and a RE-rich grain boundary phase. However, sintering resulted in segregation of Y to the inner and Nd to the outside of the 2-14-1 grains. The magnet has a room temperature (BH) max of 25.4 MGOe, which is two times higher than that of the isotropic melt spun ribbons with similar compositions. The temperature coefficients of Br (α) and Hcj (Β) for the magnet are -0.150 and -0.632%/°C from 27 to 127 °C, respectively. These temperature coefficients, especially for Β, are also much higher than those of melt spun ribbons. The composition segregation in the 2-14-1 grains is believed to be responsible for the higher temperature coefficients.",

author = "W. Tang and Wu, {Y. Q.} and Oster, {N. T.} and Dennis, {K. W.} and Kramer, {M. J.} and Anderson, {I. E.} and McCallum, {R. W.}",

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T1 - Improved energy product in grained aligned and sintered MRE2 Fe14 B magnets (MRE=Y+Dy+Nd)

AU - Tang, W.

AU - Wu, Y. Q.

AU - Oster, N. T.

AU - Dennis, K. W.

AU - Kramer, M. J.

AU - Anderson, I. E.

AU - McCallum, R. W.

PY - 2010/5/1

Y1 - 2010/5/1

N2 - Sintered [Nd0.45 (Y3 Dy1) 0.25 0.55] 2.8 Fe14 B magnets were prepared for the first time. Magnetic properties and microstructures of the magnets were investigated by magnetic measurements and electron microprobe analysis. The microstructure consists of a MRE2 Fe14 B (2-14-1) phase matrix having a grain size of ∼10μm and a RE-rich grain boundary phase. However, sintering resulted in segregation of Y to the inner and Nd to the outside of the 2-14-1 grains. The magnet has a room temperature (BH) max of 25.4 MGOe, which is two times higher than that of the isotropic melt spun ribbons with similar compositions. The temperature coefficients of Br (α) and Hcj (Β) for the magnet are -0.150 and -0.632%/°C from 27 to 127 °C, respectively. These temperature coefficients, especially for Β, are also much higher than those of melt spun ribbons. The composition segregation in the 2-14-1 grains is believed to be responsible for the higher temperature coefficients.

AB - Sintered [Nd0.45 (Y3 Dy1) 0.25 0.55] 2.8 Fe14 B magnets were prepared for the first time. Magnetic properties and microstructures of the magnets were investigated by magnetic measurements and electron microprobe analysis. The microstructure consists of a MRE2 Fe14 B (2-14-1) phase matrix having a grain size of ∼10μm and a RE-rich grain boundary phase. However, sintering resulted in segregation of Y to the inner and Nd to the outside of the 2-14-1 grains. The magnet has a room temperature (BH) max of 25.4 MGOe, which is two times higher than that of the isotropic melt spun ribbons with similar compositions. The temperature coefficients of Br (α) and Hcj (Β) for the magnet are -0.150 and -0.632%/°C from 27 to 127 °C, respectively. These temperature coefficients, especially for Β, are also much higher than those of melt spun ribbons. The composition segregation in the 2-14-1 grains is believed to be responsible for the higher temperature coefficients.

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Improved energy product in grained aligned and sintered MRE₂ Fe14 B magnets (MRE=Y+Dy+Nd)

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