Effect of WS2/Al co-doping on microstructural and magnetic properties of Nd−Fe−B sintered magnets

Kyoung Hoon Bae; Seong Rae Lee; Hyo Jun Kim; Min Woo Lee; Tae Suk Jang

doi:10.1016/j.jallcom.2016.03.023

Effect of WS₂/Al co-doping on microstructural and magnetic properties of Nd−Fe−B sintered magnets

Kyoung Hoon Bae, Seong Rae Lee, Hyo Jun Kim, Min Woo Lee, Tae Suk Jang

Department of Materials Science and Engineering

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

14 Citations (Scopus)

Abstract

The effect of WS₂ (0–1.2 wt.%) and Al (0.3 wt.%) doping on microstructural and magnetic properties of Nd₂Fe₁₄B sintered magnets was investigated. Grain growth in WS₂-doped magnets was inhibited by the grain boundary (GB) pinning resulting in increased magnet coercivity. Al co-doping (0.3 wt.%) produced continuous Nd-rich grain boundary phases (GBPs), in which fine WFeB precipitates were distributed selectively at the grain boundaries due to the higher fluidity of the liquid phases. 0.6 wt.% WS₂/Al co-doped magnets are characterized by the optimum magnetic properties because of the smaller grain sizes and formation of continuous Nd-rich GB phases. When the WS₂ content exceeds 0.6 wt.%, magnetic properties of the resulting magnets deteriorate due to the reduction in magnet density and relatively large WFeB precipitates formed inside the main phase and at the GBs.

Original language	English
Pages (from-to)	321-326
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	673
DOIs	https://doi.org/10.1016/j.jallcom.2016.03.023
Publication status	Published - 2016 Jul 15

Bibliographical note

Funding Information:
This research was supported by the Technology Innovation Program funded by the Ministry of Knowledge Economy (MKE, Korea) (Grant No. 10043780 ), Republic of Korea.

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

Magnetic measurements
Magnetization
Microstructure
Powder metallurgy
Rare earth alloys and compounds

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2016.03.023

Cite this

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title = "Effect of WS2/Al co-doping on microstructural and magnetic properties of Nd−Fe−B sintered magnets",

abstract = "The effect of WS2 (0–1.2 wt.%) and Al (0.3 wt.%) doping on microstructural and magnetic properties of Nd2Fe14B sintered magnets was investigated. Grain growth in WS2-doped magnets was inhibited by the grain boundary (GB) pinning resulting in increased magnet coercivity. Al co-doping (0.3 wt.%) produced continuous Nd-rich grain boundary phases (GBPs), in which fine WFeB precipitates were distributed selectively at the grain boundaries due to the higher fluidity of the liquid phases. 0.6 wt.% WS2/Al co-doped magnets are characterized by the optimum magnetic properties because of the smaller grain sizes and formation of continuous Nd-rich GB phases. When the WS2 content exceeds 0.6 wt.%, magnetic properties of the resulting magnets deteriorate due to the reduction in magnet density and relatively large WFeB precipitates formed inside the main phase and at the GBs.",

keywords = "Magnetic measurements, Magnetization, Microstructure, Powder metallurgy, Rare earth alloys and compounds",

author = "Bae, {Kyoung Hoon} and Lee, {Seong Rae} and Kim, {Hyo Jun} and Lee, {Min Woo} and Jang, {Tae Suk}",

note = "Funding Information: This research was supported by the Technology Innovation Program funded by the Ministry of Knowledge Economy (MKE, Korea) (Grant No. 10043780 ), Republic of Korea. Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

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doi = "10.1016/j.jallcom.2016.03.023",

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AU - Bae, Kyoung Hoon

AU - Lee, Seong Rae

AU - Kim, Hyo Jun

AU - Lee, Min Woo

AU - Jang, Tae Suk

N1 - Funding Information: This research was supported by the Technology Innovation Program funded by the Ministry of Knowledge Economy (MKE, Korea) (Grant No. 10043780 ), Republic of Korea. Publisher Copyright: © 2016 Elsevier B.V.

PY - 2016/7/15

Y1 - 2016/7/15

N2 - The effect of WS2 (0–1.2 wt.%) and Al (0.3 wt.%) doping on microstructural and magnetic properties of Nd2Fe14B sintered magnets was investigated. Grain growth in WS2-doped magnets was inhibited by the grain boundary (GB) pinning resulting in increased magnet coercivity. Al co-doping (0.3 wt.%) produced continuous Nd-rich grain boundary phases (GBPs), in which fine WFeB precipitates were distributed selectively at the grain boundaries due to the higher fluidity of the liquid phases. 0.6 wt.% WS2/Al co-doped magnets are characterized by the optimum magnetic properties because of the smaller grain sizes and formation of continuous Nd-rich GB phases. When the WS2 content exceeds 0.6 wt.%, magnetic properties of the resulting magnets deteriorate due to the reduction in magnet density and relatively large WFeB precipitates formed inside the main phase and at the GBs.

AB - The effect of WS2 (0–1.2 wt.%) and Al (0.3 wt.%) doping on microstructural and magnetic properties of Nd2Fe14B sintered magnets was investigated. Grain growth in WS2-doped magnets was inhibited by the grain boundary (GB) pinning resulting in increased magnet coercivity. Al co-doping (0.3 wt.%) produced continuous Nd-rich grain boundary phases (GBPs), in which fine WFeB precipitates were distributed selectively at the grain boundaries due to the higher fluidity of the liquid phases. 0.6 wt.% WS2/Al co-doped magnets are characterized by the optimum magnetic properties because of the smaller grain sizes and formation of continuous Nd-rich GB phases. When the WS2 content exceeds 0.6 wt.%, magnetic properties of the resulting magnets deteriorate due to the reduction in magnet density and relatively large WFeB precipitates formed inside the main phase and at the GBs.

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