On the formation of nanocrystals in the soft magnetic alloy Fe73.5Nb3Cu1Si13.5B9

被引：152
|
作者：
Ayers, JD [1 ]
Harris, VG [1 ]
Sprague, JA [1 ]
Elam, WT [1 ]
Jones, HN [1 ]
机构：
[1] USN, Res Lab, Washington, DC 20375 USA
来源：
ACTA MATERIALIA | 1998年 / 46卷 / 06期
关键词：
D O I：
10.1016/S1359-6454(97)00436-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Studies were conducted on alloys of atomic mass composition Fe73.5Nb3Cu1Si13.5B9 and Fe76.5Cu1Si13.5B9 TEM studies demonstrated that Fe-rich nanocrystals precipitated from the amorphous starting materials exhibited the DO, structure from very early in the transformation process. This result was corroborated by extended X-ray absorption fines structure (EXAFS) studies which showed evidence of ordering in the Fe-rich precipitates from early in the transformation process. EXAFS studies also showed that Cu clusters with near-f.c.c. structure were present from very early stages of the crystallization process. A model is proposed which describes the role of the Cu clusters as catalyzing nucleation of the DO3 crystallites by providing a low energy interface upon which the activation energy for nucleation of the DO3 phase is lowered. (C) 1998 Acta Metallurgica Inc.
引用
收藏
页码：1861 / 1874
页数：14
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