Abstract
Nanoquasicrystallization and the local structure of several Zr-based metallic glasses were investigated in correlation with a stability of the supercooled liquid state. Single icosahedral quasicrystalline phase (I-phase) formation is confirmed in the Zr70Al10Ni20 ternary and Zr70Cu30 binary metallic glasses with a high stability of the supercooled liquid state by the addition of a small amount of a noble metal such as 0.5-1 at.% Pd or Au. Since the local structure does not change by nanoquasicrystallization as well as by the addition of 1 at.% Pd in the Zr70Al10Ni20 ternary metallic glass on the basis of an extended X-ray absorption fine structure (EXAFS) study, we propose an icosahedral local structure in the quasicrystal-forming metallic glasses. No I-phase formation is observed in the Zr70Ni30 binary alloy by the addition of 1 at.% Pd or Au, in which the stability of the supercooled liquid state is lower than those in the Zr70Cu30, Zr65Al7.5Cu27.5 and Zr70Al10Ni20 alloys. Since the tetragonal Zr2Ni-like local structure is identified in the Zr70Ni30 amorphous alloy, it is concluded that a strong correlation exists between the stability of the supercooled liquid state and the icosahedral local structure in the glassy state in Zr-based metallic glasses.
Original language | English |
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Pages (from-to) | 3704-3708 |
Number of pages | 5 |
Journal | Journal of Non-Crystalline Solids |
Volume | 353 |
Issue number | 32-40 |
DOIs | |
Publication status | Published - 2007 Oct 15 |
Keywords
- Amorphous metals, metallic glasses
- Crystal growth
- Nanocrystals
- Phases and equilibria
- Quasicrystals
- Short-range order
- Structure
- X-rays
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry