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Enhancement of coercivity of hot-deformed Nd–Fe–B anisotropic magnet by low-temperature grain boundary diffusion of Nd60Dy20Cu20 eutectic alloy

2013年9月13日(金)
(2013.09.13 更新)

Scripta Materialia 69 (2013) 647–650

H. Sepehri-Amin,a,b J. Liu,a,c T. Ohkubo,a,b K. Hioki,d A. Hattorid and K. Honoa,b,c,*
a Elements Strategy Initiative Center for Magnetic Materials, National Institute for Materials Science
b CREST, Japan Science and Technology Agency
c Graduate School of Pure and Applied Sciences, University of Tsukuba
d Daido Corporate Research & Development Center, Daido Steel Co. Ltd.

Abstract

The coercivity of a hot-deformed Nd–Fe–B magnet was enhanced from 1.6 to 2.6 T by a lowtemperature grain boundary diffusion process using a Nd60Dy20Cu20 near-eutectic alloy.
The alloy melt infiltrates into the magnet through grain boundaries at the processing temperature of 650 C.
The composition of ferromagnetic elements in the intergranular phase parallel to the c-planes decreases substantially and thin Dy-rich shell surrounds the Nd2Fe14B phase grains after the diffusion process, which explains the large enhancement in coercivity.


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