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

    10 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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