Effect of Nd content on the microstructure and coercivity of hot-deformed Nd-Fe-B permanent magnets

J. Liu; H. Sepehri-Amin; T. Ohkubo; K. Hioki; A. Hattori; T. Schrefl; K. Hono

doi:10.1016/j.actamat.2013.05.027

Effect of Nd content on the microstructure and coercivity of hot-deformed Nd-Fe-B permanent magnets

J. Liu, H. Sepehri-Amin, T. Ohkubo, K. Hioki, A. Hattori, T. Schrefl, K. Hono

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

132 Citations (Scopus)

Abstract

The microstructure of hot-deformed Nd-Fe-B permanent magnets with different Nd contents was investigated in order to correlate them with the hard magnetic properties. A thick distinct Nd-rich grain boundary (GB) layer was observed in a high Nd content sample by scanning electron microscopy and transmission electron microscopy. Three-dimensional atom probe results showed a significant increase in the Nd content in the GB as the overall Nd content in the alloy increased. We found a clear correlation between the Nd concentration in the GB layer and the coercivity. The mechanism of the coercivity increase is discussed based on the microstructure characterization and micromagnetic simulation results.

Original language	English
Pages (from-to)	5387-5399
Number of pages	13
Journal	Acta Materialia
Volume	61
Issue number	14
DOIs	https://doi.org/10.1016/j.actamat.2013.05.027
Publication status	Published - 2013 Aug
Externally published	Yes

Keywords

Chemical composition
Coercivity
Hot-deformed
Microstructure
Nd-Fe-B

ASJC Scopus subject areas

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

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abstract = "The microstructure of hot-deformed Nd-Fe-B permanent magnets with different Nd contents was investigated in order to correlate them with the hard magnetic properties. A thick distinct Nd-rich grain boundary (GB) layer was observed in a high Nd content sample by scanning electron microscopy and transmission electron microscopy. Three-dimensional atom probe results showed a significant increase in the Nd content in the GB as the overall Nd content in the alloy increased. We found a clear correlation between the Nd concentration in the GB layer and the coercivity. The mechanism of the coercivity increase is discussed based on the microstructure characterization and micromagnetic simulation results.",

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AU - Liu, J.

AU - Sepehri-Amin, H.

AU - Ohkubo, T.

AU - Hioki, K.

AU - Hattori, A.

AU - Schrefl, T.

AU - Hono, K.

PY - 2013/8

Y1 - 2013/8

N2 - The microstructure of hot-deformed Nd-Fe-B permanent magnets with different Nd contents was investigated in order to correlate them with the hard magnetic properties. A thick distinct Nd-rich grain boundary (GB) layer was observed in a high Nd content sample by scanning electron microscopy and transmission electron microscopy. Three-dimensional atom probe results showed a significant increase in the Nd content in the GB as the overall Nd content in the alloy increased. We found a clear correlation between the Nd concentration in the GB layer and the coercivity. The mechanism of the coercivity increase is discussed based on the microstructure characterization and micromagnetic simulation results.

AB - The microstructure of hot-deformed Nd-Fe-B permanent magnets with different Nd contents was investigated in order to correlate them with the hard magnetic properties. A thick distinct Nd-rich grain boundary (GB) layer was observed in a high Nd content sample by scanning electron microscopy and transmission electron microscopy. Three-dimensional atom probe results showed a significant increase in the Nd content in the GB as the overall Nd content in the alloy increased. We found a clear correlation between the Nd concentration in the GB layer and the coercivity. The mechanism of the coercivity increase is discussed based on the microstructure characterization and micromagnetic simulation results.

KW - Chemical composition

KW - Coercivity

KW - Hot-deformed

KW - Microstructure

KW - Nd-Fe-B

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Effect of Nd content on the microstructure and coercivity of hot-deformed Nd-Fe-B permanent magnets

Abstract

Keywords

ASJC Scopus subject areas

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