Prospect for HRE-free high coercivity Nd-Fe-B permanent magnets

被引：118

作者：

Hono, K. ^{[1
]}

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

机构：

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

来源：

SCRIPTA MATERIALIA | 2018年 / 151卷

关键词：

Permanent magnet; Rare earth permanent magnet; Nd-Fe-B; Heavy rare earth; Coercivity; GRAIN-SIZE DEPENDENCE; FORCE DECREASE RATIO; SINTERED MAGNETS; ANGULAR-DEPENDENCE; BOUNDARY PHASE; MICROSTRUCTURE; MAGNETIZATION; DIFFUSION; ALIGNMENT; ALLOYS;

D O I：

10.1016/j.scriptamat.2018.03.012

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Recent state-of-the-art microstructure investigations on Nd-Fe-B sintered magnets have revealed that the Nd2Fe14B grains in conventional sintered magnets are exchange-coupled through ferromagnetic grain boundary phase and the coercivity is governed by domain wall pinning, while exchange-decoupled sintered magnets can be processed by tuning the chemical composition to a slightly Nd-rich and B-lean one with Ga-doping. The coercivity of exchange-decoupled magnets is governed by the nucleation mechanism, giving rise to higher coercivity. Based on recent studies on microstructure-coercivity relationships of various Nd-Fe-B magnets, prospect of HRE-free high coercivity and high remanence magnets is discussed. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：6 / 13

页数：8

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