Stability and diffraction features of quasicrystal and 2/1 approximant phase in an Au42In42Yb16 alloy

Alok Singh, J. Q. Guo, A. P. Tsai

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

An Au42In42Yb16 alloy has been studied by transmission electron microscopy in as-cast and melt-spun conditions. The as-cast alloy was found to contain a cubic 2/1 approximant phase (along with another crystalline phase) with lattice parameter 2.46 nm and space group P a over(3, ̄). Electron diffraction features of this phase have been described. An icosahedral quasicrystal formed on melt-spinning. Differential thermal analysis indicates that the quasicrystalline phase is stable above 525 °C, until melting. Annealing at temperature 550 °C improves the quality of the quasicrystal, while annealing at 450 °C shows transformation to a microcrystalline state. At both temperatures, a 1/1 cubic approximant phase separates out.

Original languageEnglish
Pages (from-to)991-994
Number of pages4
JournalMaterials Science and Engineering A
Volume448-451
DOIs
Publication statusPublished - 2007 Mar 25

Keywords

  • Interfaces
  • Melting
  • Nanoparticles
  • Orientation relationship
  • Quasicrystal

ASJC Scopus subject areas

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

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