Nanocrystallization of complex Fe23B6-type structure in glassy Fe-Co-B-Si-Nb alloy

Akihiko Hirata*, Yoshihiko Hirotsu, Kenji Amiya, Nobuyuki Nishiyama, Akihisa Inoue

*この研究の対応する著者

研究成果: Article査読

50 被引用数 (Scopus)

抄録

Local structural development in the bulk metallic glass (Fe0.5Co0.5)72B20Si4Nb4 on annealing has been investigated using transmission electron microscopy. Nanoscale crystalline grains with the Fe23B6-type structure were densely formed during annealing around the first crystallization temperature. In the state prior to the crystallization (below Tg), we found extended medium range ordered (MRO) regions as small as 2 nm with an extremely high density in the glass matrix. The nanocrystallized microstructure is presumably ascribed to the presence of the dense MRO regions. On the basis of nanobeam diffraction analysis, however, it was found that most of the MRO regions have no clear order of the Fe23B6-type structure. The clear Fe23B6 order was found in regions extending as large as 5 nm at a higher temperature (around Tg). A relationship between the structural change and the glass stability is discussed.

本文言語English
ページ(範囲)491-497
ページ数7
ジャーナルIntermetallics
16
4
DOI
出版ステータスPublished - 2008 4月
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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