Nanoquasicrystallization in Metallic Glasses

Junji Saida, Eiichiro Matsubara, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Nanoquasicrystallization in Zr-based glassy alloys was investigated. It is found that the nano scale icosahedral quasicrystalline phase (I-phase) is formed by addition of the elements, which obstruct the glass-forming ability (GFA) in the glassy alloy. The primary phase of fee Zr2Ni phase in the Zr65Al7.5Ni10Cu17.5 glassy alloy with high GFA changes to the fcc Zr2Ni plus I-phases by substitution of noble metals or Zr for only 1 at% Cu. Since each phase is precipitated independently and the icosahedral local atomic configuration exits in the fee Zr2Ni and I-phases, they are originated from the same local structure in the Zr-based glassy alloy with high GFA. We found that the icosahedral local structure is strongly correlated with the stability of the supercooled liquid state. The origin of the icosahedral local structure is combination of Zr + Cu and Zr + Al + Ni elements. In these alloy systems, the I-phase is easy to precipitate as a primary phase by addition of a very small amount of appropriate element. From the present results, it is concluded that the icosahedral local structure stabilizes the supercooled liquid state. We suggest that the high GFA for the preparation of bulk glassy alloy is attributed to the stability of icosahedral local structure.

Original languageEnglish
Pages (from-to)1971-1977
Number of pages7
JournalMaterials Transactions
Volume44
Issue number10
DOIs
Publication statusPublished - 2003 Oct

Keywords

  • Local structure
  • Metastable phase
  • Nano icosahedral phase
  • Supercooled liquid state
  • Transformation
  • Zirconium-based metallic glass

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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