Coercivity degradation caused by inhomogeneous grain boundaries in sintered Nd-Fe-B permanent magnets

被引：10

作者：

Chen, Hansheng ^{[1
,2
,3
]}

Yun, Fan ^{[1
,2
,3
]}

Qu, Jiangtao ^{[1
,2
,3
]}

Li, Yingfei ^{[4
]}

Cheng, Zhenxiang ^{[4
]}

Fang, Ruhao ^{[1
,2
,3
]}

Ye, Zhixiao ^{[5
]}

Ringer, Simon P. ^{[2
,6
]}

Zheng, Rongkun ^{[1
,2
,3
]}

机构：

[1] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia

[2] Univ Sydney, Univ Sydney Nano Inst, Sydney, NSW 2006, Australia

[3] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia

[4] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia

[5] Hengdian Grp DMEGC Magnet Co Ltd, Jinhua 322118, Zhejiang, Peoples R China

[6] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia

来源：

PHYSICAL REVIEW MATERIALS | 2018年 / 2卷 / 05期

基金：

澳大利亚研究理事会;

关键词：

NUCLEATION FIELDS; MICROSTRUCTURE; PHASE; DEPENDENCE; ENHANCEMENT; MECHANISM;

D O I：

10.1103/PhysRevMaterials.2.054404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Quantitative correlation between intrinsic coercivity and grain boundaries in three dimensions is critical to further improve the performance of sintered Nd-Fe-B permanent magnets. Here, we quantitatively reveal the local composition variation across and especially along grain boundaries using the powerful atomic-scale analysis technique known as atom probe tomography. We also estimate the saturation magnetization, magnetocrystalline anisotropy constant, and exchange stiffness of the grain boundaries on the basis of the experimentally determined structure and composition. Finally, using micromagnetic simulations, we quantify the intrinsic coercivity degradation caused by inhomogeneous grain boundaries. This approach can be applied to other magnetic materials for the analysis and optimization of magnetic properties.

引用

页数：9

共 50 条

[1] GRAIN-SIZE DEPENDENCE OF COERCIVITY OF SINTERED ND-FE-B PERMANENT-MAGNETS
TANG, WH
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[J]. JOURNAL OF THE JAPAN INSTITUTE OF METALS AND MATERIALS, 2017, 81 (01) : 1 - 1
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[J]. IEEE TRANSACTIONS ON MAGNETICS, 2006, 42 (10) : 2909 - 2911
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