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

SCRIPTA MATERIALIA

卷:160

Article

Xu, X. D.¹  Sepehri-Amin, H.¹  Sasaki, T. T.¹  Soderznik, M.²  Tang, X.¹  Ohkubo, T.¹  Hono, K.¹ 

[1] Natl Inst Mat Sci, ESICMM, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[2] Jozef Stefan Inst, Dept Nanostruct Mat, Jamova C 39, Ljubljana 1000, Slovenia

关键词: Nd-Fe-B;    Hot-deformed magnet;    Coercivity;    Squareness;    Grain boundary phase;   

DOI  :  10.1016/j.scriptamat.2018.09.028

来源: Elsevier

【 摘 要 】

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, mu 0H(c) = 1.93 T, and better squareness, H-k90/H-c = 0.96, compared to those of the sintered magnet, mu 0H(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 Kronmuller 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. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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