The role of Cu addition in the coercivity enhancement of sintered Nd-Fe-B permanent magnets

被引：84

作者：

Li, W. F. ^{[1
]}

Ohkubo, T. ^{[1
]}

Akiya, T. ^{[2
]}

Kato, H. ^{[2
,3
]}

Hono, K. ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[2] Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808579, Japan

[3] Yamagata Univ, Dept Appl Math & Phys, Yamagata 9908560, Japan

来源：

JOURNAL OF MATERIALS RESEARCH | 2009年 / 24卷 / 02期

关键词：

MICROSTRUCTURE; BEHAVIOR; PHASE; COPPER; FIELD;

D O I：

10.1557/JMR.2009.0041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To understand the mechanism of the coercivity enhancement by a trace addition of Cu in Nd-Fe-B sintered magnets, we investigated the microstructure difference between Cu-doped and Cu-free alloys using high resolution scanning electron microscopy (HRSEM), transmission electron microscopy (TEM), and laser assisted three dimensional atom probe (LA-3DAP). From a serial sectioning back scattered electron (BSE) images of the Nd-rich phase obtained by an integration of the focused ion beam (FIB) and HRSEM technique, it was found that Cu addition leads to a continuous formation of Nd-rich thin layers along the grain boundaries. 3DAP analysis has shown that a thin Cu-rich layer with a thickness of approximately 2 nm is present at the interface between the Nd2Fe14B and Nd-rich phase grains.

引用

页码：413 / 420

页数：8

共 27 条

[1] PREPARATION AND TRANSMISSION ELECTRON-MICROSCOPE INVESTIGATION OF SINTERED ND15.4FE75.7B6.7CU1.3NB0.9 MAGNETS [J].