MICROSTRUCTURE STUDY OF HIGH COERCIVITY GA CONTAINING ND-FE-B PERMANENT-MAGNETS

被引：5
作者：
AHMAD, I
ALKHAFAJI, MA
DAVIES, HA
RAINFORTH, WM
BUCKLEY, RA
机构：
[1] Department of Engineering Materials, University of Sheffield, Sheffield
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1995年 / 145卷 / 1-2期
关键词：
D O I：
10.1016/0304-8853(94)01670-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Recently we reported that substitution of 1 at% of Fe by Ga in a Nd18Fe76B6 alloy led, in some cases, to an increase in coercivity by a factor of 2 (to > 46 kOe) for chill block melt spun ribbons. In this paper a microstructural investigation by high resolution transmission electron microscopy of the Ga-containing ribbons is reported. It was observed that the Ga entered only the Nd2Fe14B hard magnetic phase with no evidence of its presence in the Nd-rich grain boundary phase. Ultra fine particles of similar to 5 nm mean diameter were observed within the Nd2Fe14B crystallites and these have been identified as rhombohedral gallium by analysis of lattice images. The possible reasons for the increased coercivity are briefly discussed.
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页码：L19 / L22
页数：4
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