Nucleation and growth of nano icosahedral phase in Zr65Al7.5Ni10Cu7.5M10 (M=Ag and Pd) glassy alloys

J. Saida, M. Matsushita, A. Inoue

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)

Abstract

We examined the nucleation and growth behavior of a nano icosahedral phase from a supercooled liquid region in the Zr65Al7.5Ni10Cu7.5M10 (M=Ag or Pd) glassy alloys by differential scanning calorimetry and transmission electron microscopy. It is found that the growth rate of the icosahedral phase is nearly constant at the initial stage and much slower than that of the Zr2Ni phase in the Zr65Al7.5Ni10Cu17.5 glassy alloy. The maximum homogeneous nucleation rate of the icosahedraI phase in the Zr65Al7.5Ni10Cu7.5Ag10 glass is calculated as 4.4×1020 m-3s-1 at 695 K, which is approximately 104 times higher than that of the Zr2Ni phase in the Zr65Al7.5Ni10Cu17.5 glass. The nucleation rate of the primary phase increases significantly and the growth rate at the crystallization temperature decreases with increasing Pd content. Thus, the addition of Ag and Pd is effective for the increase of the number of nucleation sites and the suppression of grain growth, which is the main reason for the formation of icosahedral nano particles. It is, therefore strongly suggested that an icosahedral short-range order exists in the glassy state of the present alloys.

Original languageEnglish
Pages (from-to)73-78
Number of pages6
JournalMaterials Science Forum
Volume360-362
Publication statusPublished - 2001 Jan 1
Externally publishedYes
EventMetastable, Mechanically Alloyed and Nanocrystalline Materials (ISMANAM 2000) - Oxford, United Kingdom
Duration: 2000 Jul 92000 Jul 14

Keywords

  • Grain growth
  • Icosahedral phases
  • Metallic glasses
  • Nano phase
  • Nucleation
  • Zirconium base alloy

ASJC Scopus subject areas

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

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