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

Akihiko Hirata; Yoshihiko Hirotsu; Kenji Amiya; Nobuyuki Nishiyama; Akihisa Inoue

doi:10.1016/j.intermet.2007.11.006

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

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

Trans-Regional Corporation Center for Industrial Materials Research

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

Local structural development in the bulk metallic glass (Fe_0.5Co_0.5)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 T_g), 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 T_g). A relationship between the structural change and the glass stability is discussed.

Original language	English
Pages (from-to)	491-497
Number of pages	7
Journal	Intermetallics
Volume	16
Issue number	4
DOIs	https://doi.org/10.1016/j.intermet.2007.11.006
Publication status	Published - 2008 Apr

Keywords

B. Glasses, metallic
F. Diffraction
F. Electron microscopy, transmission

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.intermet.2007.11.006

Cite this

@article{6e95b5b244434dafa382c9ba38243906,

title = "Nanocrystallization of complex Fe23B6-type structure in glassy Fe-Co-B-Si-Nb alloy",

abstract = "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.",

keywords = "B. Glasses, metallic, F. Diffraction, F. Electron microscopy, transmission",

author = "Akihiko Hirata and Yoshihiko Hirotsu and Kenji Amiya and Nobuyuki Nishiyama and Akihisa Inoue",

note = "Funding Information: This work is partly supported by the Grant-in-Aid of Ministry of Education, Sports, Culture, Science and Technology, Priority Area on “Materials Science of Bulk Metallic Glasses” and by the New Energy and Industrial Technology Development Organization under “Processing Technology for Metallic Glasses” of Material Industrial Competitiveness Strengthening Program. This work is also supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (B), 18360306, 2006. One of us (A.H.) also acknowledges Mr. A. Koreeda for his technical helps.",

year = "2008",

month = apr,

doi = "10.1016/j.intermet.2007.11.006",

language = "English",

volume = "16",

pages = "491--497",

journal = "Intermetallics",

issn = "0966-9795",

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T1 - Nanocrystallization of complex Fe23B6-type structure in glassy Fe-Co-B-Si-Nb alloy

AU - Hirata, Akihiko

AU - Hirotsu, Yoshihiko

AU - Amiya, Kenji

AU - Nishiyama, Nobuyuki

AU - Inoue, Akihisa

N1 - Funding Information: This work is partly supported by the Grant-in-Aid of Ministry of Education, Sports, Culture, Science and Technology, Priority Area on “Materials Science of Bulk Metallic Glasses” and by the New Energy and Industrial Technology Development Organization under “Processing Technology for Metallic Glasses” of Material Industrial Competitiveness Strengthening Program. This work is also supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (B), 18360306, 2006. One of us (A.H.) also acknowledges Mr. A. Koreeda for his technical helps.

PY - 2008/4

Y1 - 2008/4

N2 - 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.

AB - 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.

KW - B. Glasses, metallic

KW - F. Diffraction

KW - F. Electron microscopy, transmission

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