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

被引：94

作者：

Liu, Lihua ^{[1
,2
]}

Sepehri-Amin, H. ^{[1
]}

Ohkubo, T. ^{[1
]}

Yano, M. ^{[3
]}

Kato, A. ^{[3
]}

Sakuma, N. ^{[3
]}

Shoji, T. ^{[3
]}

Hono, K. ^{[1
,2
]}

机构：

[1] Natl Inst Mat Sci, Elements Strategy Initiat Ctr Magnet Mat, Tsukuba, Ibaraki 3050047, Japan

[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058577, Japan

[3] Toyota Motor Co Ltd, Adv Mat Engn Div, Susono 4101193, Japan

来源：

SCRIPTA MATERIALIA | 2017年 / 129卷

关键词：

Permanent magnets; Nd-Fe-B; Coercivity; Hot-deformed magnets; SINTERED MAGNETS; PERMANENT-MAGNETS; MICROSTRUCTURE;

D O I：

10.1016/j.scriptamat.2016.10.020

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 130 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 degrees 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. (C) 2016 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.

引用

页码：44 / 47

页数：4

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