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Preface

Nano structure of rapidly quenched Cu–(Zr or Hf) – Ti alloys and their devitrification process

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Investigation of mechanical properties and devitrification of Cu-based bulk glass formers alloyed with noble metals

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Domain structures of nanocrystalline Fe90Zr7B3 alloy studied by Lorentz microscopy

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Domain structures of nanocrystalline Fe90Zr7B3 alloy studied by Lorentz microscopy

Content Provider	Taylor & Francis Online
Author	Bitoh, Teruo Shindo, Daisuke Makino, Akihiro Gao, Youhui
Abstract	As-quenched Fe90Zr7B3 alloy has been crystallized at 773, 923 and 973 K, it is found that the specimens annealed at 773 and 923 K have grains with the same size, but the one annealed at 773 K has a thick amorphous matrix and a broad grain size distribution. Big domains and smooth domain walls are observed in the specimen annealed at the optimum condition (923 K), and excellent magnetic softness is obtained. On the other hand, the one annealed at 973 K has very large grains (40 nm). Very small domains with irregular walls are observed, indicating a weak intergranular exchange coupling.Through in situ Lorentz microscopy, a relaxation of internal stress in the specimen annealed at 773 K is observed at anelevated temperature (333 K). The internal stress observed is considered to be one of the important factors that degrade the soft magnetic properties. Based on the results of differential thermal analysis, a two-step annealing, where the as-quenched specimen is pre-heated at 723 K and subsequently annealed at 773 K, is utilized. The domain structure of the specimen treated by the two-step annealing is analyzed. It is found that the size of the domain is larger than that of the specimen annealed at 773 K, suggesting the possibility of control of the soft magnetic properties.
Starting Page	353
Ending Page	359
Page Count	7
File Format	PDF HTM / HTML
ISSN	14686996 18785514
DOI	10.1016/j.stam.2003.09.001
Journal	Science and Technology of Advanced Materials
Volume Number	4
Issue Number	4
Language	English
Publisher	Taylor & Francis
Publisher Date	2003-11-04
Access Restriction	Open
Subject Keyword	Fe–Zr–B Nanocrystalline Soft magnetic materials Domain structure Two-step annealing Lorentz microsocpy
Content Type	Text
Resource Type	Article
Subject	Materials Science

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Domain structures of nanocrystalline Fe90Zr7B3 alloy studied by Lorentz microscopy

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