Relaxation and Crystallization Behavior of the Zr<SUB>50</SUB>Cu<SUB>40</SUB>Al<SUB>10</SUB> Metallic Glass
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- Yano Takaaki
- Department of Materials Science, Osaka Prefecture University
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- Yorikado Yuhi
- Department of Materials Science, Osaka Prefecture University
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- Akeno Yasutake
- Graduate School of Engineering, University of Hyogo
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- Hori Fuminobu
- Department of Materials Science, Osaka Prefecture University
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- Yokoyama Yoshihiko
- Institute for Materials Research, Tohoku University
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- Iwase Akihiro
- Department of Materials Science, Osaka Prefecture University
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- Inoue Akihisa
- Institute for Materials Research, Tohoku University
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- Konno Toyohiko J.
- Department of Materials Science, Osaka Prefecture University
Bibliographic Information
- Other Title
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- Relaxation and Crystallization Behavior of the Zr50Cu40Al10 Metallic Glass
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Abstract
We examined relaxation and crystallization behavior of the ternary Zr50Cu40Al10 metallic glass by using positron annihilation and transmission electron microscopy (TEM). Observed changes in positron annihilation lifetime of the alloy annealed isothermally at 673 K, which is below the glass transition temperature, correlate well with observed density changes; while coincidence Doppler broadening (CDB) spectra exhibit no significant change. These observations demonstrate that free volume decreases without a rearrangement of atoms during structural relaxation. On the other hand, CDB spectrum has exhibited considerable changes when the same alloy was annealed at 773 K. TEM observations suggested that crystallization occurs via growth of spherulites of several hundred nm in diameter, which themselves are composed of radially grown grains. Chemical analysis revealed that Cu atoms are partitioned out during the growth of the spherulites. Diffraction study indicated that the unit cell of the crystalline phase belong to an orthorhombic system with a=0.892, b=0.550, and c=1.060 nm; while remaining inter-spherulite regions are found to crystallize into an fcc phase with a=1.28 nm, which is probably isostructural to the τ3 phase.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 46 (12), 2886-2892, 2005
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390001204250483712
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- NII Article ID
- 130004452726
- 10017150197
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 7757976
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed