Primary precipitation of icosahedral quasicrystal with rearrangement of constitutional elements in Zr65Al7.5 Cu27.5 glassy alloy with low oxygen impurity

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Abstract

The primary transformation reaction of the Zr65Al7.5Cu27.5 ternary glassy alloy with a low oxygen impurity of approximately 100 mass ppm was investigated. We have discovered the precipitation of the metastable icosahedral phase with a fine grain size of 50-100 nm in diameter accompanying with the formation of stable Zr2Cu phase at the annealing temperatures ranging from 715 to 730 K. The lattice spacing of Zr2Cu phase decreases at higher temperatures, which is attributed to the rearrangement of Zr and Cu in the decomposition of the icosahedral phase. It is suggested that the formation of the icosahedral phase in the primary stage originates from the existence of the quenched-in icosahedral local atomic configuration in the glassy state.

Original languageEnglish
Pages (from-to)303-306
Number of pages4
JournalJournal of Materials Research
Volume20
Issue number2
DOIs
Publication statusPublished - 2005 Feb 1

ASJC Scopus subject areas

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

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