Enhancement of coercivity of hot-deformed Nd-Fe-B anisotropic magnet by low-temperature grain boundary diffusion of Nd60Dy 20Cu20 eutectic alloy

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

doi:10.1016/j.scriptamat.2013.07.011

Enhancement of coercivity of hot-deformed Nd-Fe-B anisotropic magnet by low-temperature grain boundary diffusion of Nd₆₀Dy ₂₀Cu₂₀ eutectic alloy

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

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

105 Citations (Scopus)

Abstract

The coercivity of a hot-deformed Nd-Fe-B magnet was enhanced from 1.6 to 2.6 T by a low-temperature grain boundary diffusion process using a Nd ₆₀Dy₂₀Cu₂₀ near-eutectic alloy. The alloy melt infiltrates into the magnet through grain boundaries at the processing temperature of 650 C. The composition of ferromagnetic elements in the intergranular phase parallel to the c-planes decreases substantially and thin Dy-rich shell surrounds the Nd₂Fe₁₄B phase grains after the diffusion process, which explains the large enhancement in coercivity.

Original language	English
Pages (from-to)	647-650
Number of pages	4
Journal	Scripta Materialia
Volume	69
Issue number	9
DOIs	https://doi.org/10.1016/j.scriptamat.2013.07.011
Publication status	Published - 2013 Nov
Externally published	Yes

Keywords

Coercivity
Diffusion process
Nd-Fe-B
Permanet magnet

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Access to Document

10.1016/j.scriptamat.2013.07.011

Cite this

@article{f6fefc9804424ea6a3493aaef64a9a1e,

title = "Enhancement of coercivity of hot-deformed Nd-Fe-B anisotropic magnet by low-temperature grain boundary diffusion of Nd60Dy 20Cu20 eutectic alloy",

abstract = "The coercivity of a hot-deformed Nd-Fe-B magnet was enhanced from 1.6 to 2.6 T by a low-temperature grain boundary diffusion process using a Nd 60Dy20Cu20 near-eutectic alloy. The alloy melt infiltrates into the magnet through grain boundaries at the processing temperature of 650 C. The composition of ferromagnetic elements in the intergranular phase parallel to the c-planes decreases substantially and thin Dy-rich shell surrounds the Nd2Fe14B phase grains after the diffusion process, which explains the large enhancement in coercivity.",

keywords = "Coercivity, Diffusion process, Nd-Fe-B, Permanet magnet",

author = "H. Sepehri-Amin and J. Liu and T. Ohkubo and K. Hioki and A. Hattori and K. Hono",

note = "Funding Information: H.S.-A. acknowledges the International Center for Young Scientists (ICYS), NIMS for the provision of the ICYS fellowship.",

year = "2013",

month = nov,

doi = "10.1016/j.scriptamat.2013.07.011",

language = "English",

volume = "69",

pages = "647--650",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

number = "9",

}

TY - JOUR

T1 - Enhancement of coercivity of hot-deformed Nd-Fe-B anisotropic magnet by low-temperature grain boundary diffusion of Nd60Dy 20Cu20 eutectic alloy

AU - Sepehri-Amin, H.

AU - Liu, J.

AU - Ohkubo, T.

AU - Hioki, K.

AU - Hattori, A.

AU - Hono, K.

N1 - Funding Information: H.S.-A. acknowledges the International Center for Young Scientists (ICYS), NIMS for the provision of the ICYS fellowship.

PY - 2013/11

Y1 - 2013/11

N2 - The coercivity of a hot-deformed Nd-Fe-B magnet was enhanced from 1.6 to 2.6 T by a low-temperature grain boundary diffusion process using a Nd 60Dy20Cu20 near-eutectic alloy. The alloy melt infiltrates into the magnet through grain boundaries at the processing temperature of 650 C. The composition of ferromagnetic elements in the intergranular phase parallel to the c-planes decreases substantially and thin Dy-rich shell surrounds the Nd2Fe14B phase grains after the diffusion process, which explains the large enhancement in coercivity.

AB - The coercivity of a hot-deformed Nd-Fe-B magnet was enhanced from 1.6 to 2.6 T by a low-temperature grain boundary diffusion process using a Nd 60Dy20Cu20 near-eutectic alloy. The alloy melt infiltrates into the magnet through grain boundaries at the processing temperature of 650 C. The composition of ferromagnetic elements in the intergranular phase parallel to the c-planes decreases substantially and thin Dy-rich shell surrounds the Nd2Fe14B phase grains after the diffusion process, which explains the large enhancement in coercivity.

KW - Coercivity

KW - Diffusion process

KW - Nd-Fe-B

KW - Permanet magnet

UR - http://www.scopus.com/inward/record.url?scp=84884292571&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84884292571&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2013.07.011

DO - 10.1016/j.scriptamat.2013.07.011

M3 - Article

AN - SCOPUS:84884292571

SN - 1359-6462

VL - 69

SP - 647

EP - 650

JO - Scripta Materialia

JF - Scripta Materialia

IS - 9

ER -