Microstructure of hard magnetic bccFe/NdFeB nanocomposite alloys

Citation
M. Yamasaki et al., Microstructure of hard magnetic bccFe/NdFeB nanocomposite alloys, SCR MATER, 44(8-9), 2001, pp. 1375-1378
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
SCRIPTA MATERIALIA
ISSN journal
1359-6462 → ACNP
Volume
44
Issue
8-9
Year of publication
2001
Pages
1375 - 1378
Database
ISI
SICI code
1359-6462(20010518)44:8-9<1375:MOHMBN>2.0.ZU;2-W
Abstract
The microstructure of amorphous-phase remaining bccFe/NdFeB nanocomposite N dvFebalCo8NbxCuyBz (V = 6-8, x = 0-2.5, y = 0-0.5 and z = 6-7 at%) magnet a lloys, which were prepared by melt spinning, was investigated by means of h igh resolution transmission electron microscopy (HR-TEM), three-dimensional atom probing (3DAP). and Mossbauer spectroscopy. It was found by HR-TEM th at a small amount of amorphous phase remains in the intergranular region be tween crystal grains of bccFe and Nd2Fe14B1 even after heat treatment at 74 0 degreesC. The results of 3DP showed that Nb and B atoms are significantly enriched in the remaining amorphous phase. Mossbauer spectroscoopy reveale d that the intergranular region is composed of not only so called amorphous phase but also several thin layered phases which have a rather strong hype rfine field distinctivity, and that the relative existing ratios of both th e total intergranular phases and the: Nd2Fe14B1 phase increase with increas ing Nb content. The coercivity-enhancing effect of Nb addition is discussed in this paper. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.