Precipitation of the icosahedral phase in amorphous Zr65Cu17.5-xAl7.5Ni10Agx (x=0, 2.5, 5, 7.5 and 10) alloys

J. K. Lee, S. H. Kim, W. T. Kim, D. H. Kim

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

An amorphous phase in Zr65Al7.5Cu17.5Ni10 crystallizes via co-precipitation of the I-phase and NiZr2 phase in the first crystallization step, followed by decomposition of the I-phase into the CuZr2 and NiZr2 phases. The NiZr2 phase transforms to a stable Zr6NiAl2 phase at a high temperature. The alloys containing Ag crystallize via a two-step process: firstly, the I-phase nucleates homogeneously and grows in an amorphous matrix; secondly, the quasicrystal and remaining amorphous phase transforms into the stable CuZr2 and Zr6NiAl2 phases. With increasing Ag, the I-phase becomes more thermally stable and the grain size in the I-phase decreases due to increased frequency of homogeneous nucleation. The quasi-lattice constant of the I-phase decreases with increasing Ag content.

Original languageEnglish
Pages (from-to)187-190
Number of pages4
JournalMetals and Materials International
Volume7
Issue number3
DOIs
Publication statusPublished - 2001 Jun

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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