Comparison of coercivity and squareness in hot-deformed and sintered magnets produced from a Nd-Fe-B-Cu-Ga alloy

X. D. Xu; H. Sepehri-Amin; T. T. Sasaki; M. Soderžnik; X. Tang; T. Ohkubo; K. Hono

doi:10.1016/j.scriptamat.2018.09.028

Comparison of coercivity and squareness in hot-deformed and sintered magnets produced from a Nd-Fe-B-Cu-Ga alloy

X. D. Xu, H. Sepehri-Amin, T. T. Sasaki, M. Soderžnik, X. Tang, T. Ohkubo, K. Hono

International Center for Synchrotron Radiation Innovation Smart (SRIS)

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

29 Citations (Scopus)

Abstract

We have fabricated a hot-deformed magnet from the Fe_77.1Nd_11.6Pr_3.7B_5.1Cu_0.1Co_1.0Al_0.9Ga_0.5 alloy composition that was developed for exchange-decoupled sintered magnet. The hot-deformed magnet showed a higher coercivity, μ₀H_c = 1.93 T, and better squareness, H_k90/H_c = 0.96, compared to those of the sintered magnet, μ₀H_c = 1.48 T and H_k90/H_c = 0.65. Microstructural analyses revealed the higher coercivity in the hot-deformed magnet originates from a larger contribution from the anisotropy term in the Kronmüller formula owing to fine grains, while the better squareness is primarily due to the exchange coupling of the Nd₂Fe₁₄B grains through ferromagnetic grain boundary phase, as suggested by atom probe tomography and magneto-optical Kerr effect microscopy.

Original language	English
Pages (from-to)	9-14
Number of pages	6
Journal	Scripta Materialia
Volume	160
DOIs	https://doi.org/10.1016/j.scriptamat.2018.09.028
Publication status	Published - 2019 Feb

Keywords

Coercivity
Grain boundary phase
Hot-deformed magnet
Nd-Fe-B
Squareness

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10.1016/j.scriptamat.2018.09.028

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@article{e3947b5648804e9280bf2a4edd8829d8,

title = "Comparison of coercivity and squareness in hot-deformed and sintered magnets produced from a Nd-Fe-B-Cu-Ga alloy",

abstract = "We have fabricated a hot-deformed magnet from the Fe77.1Nd11.6Pr3.7B5.1Cu0.1Co1.0Al0.9Ga0.5 alloy composition that was developed for exchange-decoupled sintered magnet. The hot-deformed magnet showed a higher coercivity, μ0Hc = 1.93 T, and better squareness, Hk90/Hc = 0.96, compared to those of the sintered magnet, μ0Hc = 1.48 T and Hk90/Hc = 0.65. Microstructural analyses revealed the higher coercivity in the hot-deformed magnet originates from a larger contribution from the anisotropy term in the Kronm{\"u}ller formula owing to fine grains, while the better squareness is primarily due to the exchange coupling of the Nd2Fe14B grains through ferromagnetic grain boundary phase, as suggested by atom probe tomography and magneto-optical Kerr effect microscopy.",

keywords = "Coercivity, Grain boundary phase, Hot-deformed magnet, Nd-Fe-B, Squareness",

author = "Xu, {X. D.} and H. Sepehri-Amin and Sasaki, {T. T.} and M. Soder{\v z}nik and X. Tang and T. Ohkubo and K. Hono",

note = "Funding Information: This work was in part supported by JST , Collaborative Research Based on Industrial Demand . The authors would like to thank Dr. Satoshi Hirosawa and Dr. Jiangnan Li for their valuable discussions. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2019",

month = feb,

doi = "10.1016/j.scriptamat.2018.09.028",

language = "English",

volume = "160",

pages = "9--14",

journal = "Scripta Materialia",

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TY - JOUR

T1 - Comparison of coercivity and squareness in hot-deformed and sintered magnets produced from a Nd-Fe-B-Cu-Ga alloy

AU - Xu, X. D.

AU - Sepehri-Amin, H.

AU - Sasaki, T. T.

AU - Soderžnik, M.

AU - Tang, X.

AU - Ohkubo, T.

AU - Hono, K.

N1 - Funding Information: This work was in part supported by JST , Collaborative Research Based on Industrial Demand . The authors would like to thank Dr. Satoshi Hirosawa and Dr. Jiangnan Li for their valuable discussions. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2019/2

Y1 - 2019/2

N2 - We have fabricated a hot-deformed magnet from the Fe77.1Nd11.6Pr3.7B5.1Cu0.1Co1.0Al0.9Ga0.5 alloy composition that was developed for exchange-decoupled sintered magnet. The hot-deformed magnet showed a higher coercivity, μ0Hc = 1.93 T, and better squareness, Hk90/Hc = 0.96, compared to those of the sintered magnet, μ0Hc = 1.48 T and Hk90/Hc = 0.65. Microstructural analyses revealed the higher coercivity in the hot-deformed magnet originates from a larger contribution from the anisotropy term in the Kronmüller formula owing to fine grains, while the better squareness is primarily due to the exchange coupling of the Nd2Fe14B grains through ferromagnetic grain boundary phase, as suggested by atom probe tomography and magneto-optical Kerr effect microscopy.

AB - We have fabricated a hot-deformed magnet from the Fe77.1Nd11.6Pr3.7B5.1Cu0.1Co1.0Al0.9Ga0.5 alloy composition that was developed for exchange-decoupled sintered magnet. The hot-deformed magnet showed a higher coercivity, μ0Hc = 1.93 T, and better squareness, Hk90/Hc = 0.96, compared to those of the sintered magnet, μ0Hc = 1.48 T and Hk90/Hc = 0.65. Microstructural analyses revealed the higher coercivity in the hot-deformed magnet originates from a larger contribution from the anisotropy term in the Kronmüller formula owing to fine grains, while the better squareness is primarily due to the exchange coupling of the Nd2Fe14B grains through ferromagnetic grain boundary phase, as suggested by atom probe tomography and magneto-optical Kerr effect microscopy.

KW - Coercivity

KW - Grain boundary phase

KW - Hot-deformed magnet

KW - Nd-Fe-B

KW - Squareness

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Comparison of coercivity and squareness in hot-deformed and sintered magnets produced from a Nd-Fe-B-Cu-Ga alloy

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Keywords

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