Atomic structure of nanoscale quasicrystal-forming Zr-noble metal binary metallic glasses

J. Saida, K. Itoh, T. Sanada, Shigeo Sato, M. Imafuku, M. Ohnuma, A. Inoue

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report the results of the local structural evaluation and mechanism of QC formation in the Zr70Pd30 and Zr80Pt 20 glassy alloys. Voronoi analysis indicates the difference of local environment between two alloys. The perfect icosahedron frequently exists around Zr atom and major polyhedra have prism-like structure around Pd in Zr 70Pd30. In contrast, icosahedral-like distorted polyhedra formation is favorable around Pt as well as Zr in Zr80Pt 20. It is therefore, concluded that the quasicrystallization originates from the medium-range order based on the Zr-centered perfect icosahedron and the Pd-centered prism-like ones remain during the QC phase formation in Zr70Pd30. Icosahedral-like local structure around Zr and Pt might contribute together to the nucleation of QC phase in Zr80Pt20. This feature with a different mechanism of QC formation in the two alloys may correlate to the difference of solute concentration and the structure of stable crystalline phase after the decomposition of QC phase.

Original languageEnglish
Pages (from-to)S27-S33
JournalJournal of Alloys and Compounds
Volume509
Issue numberSUPPL. 1
DOIs
Publication statusPublished - 2011 Jul 14

Keywords

  • Local structure
  • Metallic glasses
  • Quasicrystallization
  • Simulation
  • Zirconium-based alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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