Coercivity enhancement of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys
Coercivity enhancement of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powders by the diffusion of Nd-Cu eutectic alloys
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DOI：
10.1016/j.scriptamat.2010.08.021
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发表时间：
2010-11-01
影响因子：
6
通讯作者：
Hono, K.
中科院分区：
文献类型：
--
作者：
Sepehri-Amin, H.;Ohkubo, T.;Hono, K.
本文报道了用过共晶成分的Nd-Cu熔体进行晶界扩散，使氢化-还原-脱附-复合处理的Nd-Fe-B纳米晶粉末的矫顽力从1321 ~ 1552 kAm（-1）（19.5 kOe）提高。通过扫描电子显微镜和透射电子显微镜观察到扩散过程后明显的富Nd晶界相;然而，原子探针断层扫描表明晶界相的组成变化并不显著。在此基础上，讨论了其磁性能增强的机理。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
We report the coercivity enhancement of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B nanocrystalline powders from 1321 to 1552 kA m(-1) (19.5 kOe) by the grain boundary diffusion of Nd-Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase was observed after the diffusion process by scanning electron microscopy and transmission electron microscopy; however, atom probe tomography indicated that the change in composition of the grain boundary phase was not significant. The mechanism of the coercivity enhancement is discussed based on these results. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.