This work is supported by Grant-in-Aid of the Ministry of Education, Sports, Culture, Science and Technology, Japan, Scientific Research (B), Priority Area on “Materials Science of Bulk Metallic Glasses” and “Science and Technology of Microwave- Induced, Thermally Non-Equilibrium Reaction Fields”. It is also supported by Japan Science Promotion Society (JSPS), “Asian Core Program”.
Zeitschrift für Kristallographie
Metallic glasses -- Structure, Nanostructures -- Research, Quasicrystals, Nanostructured materials, Zirconium alloys
Formation of the nanoscale icosahedral quasicrystalline phase (I-phase) in the melt-spun Zr70Pd30 and Zr80Pt20 binary metallic glasses were reported. Local atomic structure in the glassy and quasicrystal (QC)-formed states were also analyzed by XRD and EXAFS measurements in order to investigate the formation mechanism of QC phase. The distorted icosahedral-like local structure can be identified around Zr atom in the Zr70Pd30 metallic glass. In the QC formation process, a change of local environment around Zr is detected, in which the approximately one Zr atom substitutes for one Pd atom. In contrast, since the local environment around Pt atom is remaining during the QC precipitation, it is suggested that the stable icosahedral local structure is mainly formed around a center Pt atom in the glassy state in Zr80Pt20. We also found that the local environment around Zr atom significantly changes during the quasicrystallization in the alloy. These results differ from those in the Zr70Pd30 metallic glass.
© by Oldenbourg Wissenschaftsverlag, Munchen.
Saida, J., Sanada, T., Sato, S., Imafuku, M., Li, C., & Inoue, A. (2008). Nano quasicrystal formation and local atomic structure in Zr–Pd and Zr–Pt binary metallic glasses. Zeitschrift für Kristallographie, 223(11-12), 726-730.