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Coercivity enhancement of hot-deformed Nd-Fe-B magnets by the eutectic grain boundary diffusion process using Nd62Dy20Al18 alloy

Scripta Materialia

2016年10月28日(金)
(2016.10.28 更新)

http://dx.doi.org/10.1016/j.scriptamat.2016.10.020
( Lihua Liua, H. Sepehri-Amin, T. Ohkubo, M. Yano, A. Kato, N. Sakuma, T. Shoji, K. Hono )

Abstract

The eutectic grain boundary diffusion process was applied to a 2-mm-thick hot-deformed Nd-Fe-B magnets using Nd62Dy20Al18 alloy as a diffusion source, realizing the coercivity enhancement from 0.91 T to 2.75 T with relatively small remanence deterioration from 1.50 T to 1.30 T. In contrast, the conventional grain boundary diffusion process using Dy-vapor resulted in the degradation of coercivity as the grains are catastrophically coarsened at the processing temperature of 900 °C. Scanning transmission electron microscopy showed the formation of Dy-rich shell at the sides of the Nd2Fe14B grains and the diffusion of Al into the Nd2Fe14B grains, explaining the significant improvement in coercivity.

その他特記事項

This work was supported by JST, CREST. One of the authors, LL, acknowledges NIMS for the provision of a NIMS Junior Research Assistantship.





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