Coercivity enhancement of Nd-Fe-B hot-deformed magnets by the eutectic grain boundary diffusion process using Nd-Ga-Cu and Nd-Fe-Ga-Cu alloys | Zendy

Lihua Liu | Zendy; H. SepehriAmin | Zendy; Taisuke Sasaki | Zendy; T. Ohkubo | Zendy; M. Yano | Zendy; Noritsugu Sakuma | Zendy; A. Kato | Zendy; Tetsuya Shoji | Zendy; K. Hono | Zendy

Open Access

Coercivity enhancement of Nd-Fe-B hot-deformed magnets by the eutectic grain boundary diffusion process using Nd-Ga-Cu and Nd-Fe-Ga-Cu alloys

Author(s) -

Lihua Liu,

H. SepehriAmin,

Taisuke Sasaki,

T. Ohkubo,

M. Yano,

Noritsugu Sakuma,

A. Kato,

Tetsuya Shoji,

K. Hono

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5006575

Subject(s) - coercivity , eutectic system , materials science , remanence , magnet , diffusion , grain boundary , analytical chemistry (journal) , grain boundary diffusion coefficient , texture (cosmology) , metallurgy , diffusion process , alloy , condensed matter physics , microstructure , thermodynamics , magnetization , magnetic field , chemistry , physics , chromatography , artificial intelligence , knowledge management , innovation diffusion , quantum mechanics , computer science , image (mathematics)

Nd80Ga15Cu5 and Nd62Fe14Ga20Cu4 alloys were used as diffusion sources for the eutectic grain boundary diffusion process, applying to 4 mm-thick Nd-Fe-B hot-deformed magnets. Both samples showed nearly same coercivity of 2.2 T, while the sample processed with Nd62Fe14Ga20Cu4 showed smaller remanence deterioration from 1.50 T to 1.30 T, in contrast to that of the sample processed with Nd80Ga15Cu5 to 1.08 T. Mr/Ms of the initial sample and the samples processed with Nd62Fe14Ga20Cu4 and Nd80Ga15Cu5 were 0.946, 0.934 and 0.917, respectively, suggesting that the sample processed with Nd62Fe14Ga20Cu4 retains stronger c-axis texture after the diffusion process. Nd-rich phases with Ia3¯ and fcc structures were observed in the sample processed with Nd80Ga15Cu5, while the Nd-rich phases with the Ia3¯ and hcp structures were found in the sample processed with Nd62Fe14Ga20Cu4, all of which are the phases commonly observed in Nd-Fe-B sintered magnets.

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