Microstructural features of phase transformation in a binary Pd-Si metallic glass

N. Chen, K. F. Yao, F. Ruan

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Glassy ribbons of Pd-Si alloys were prepared by a combination of melt spinning and flux treatment. The crystallization behaviour of a Pd81Si19 glassy alloy was studied through isothermal annealing at temperatures ranging lower than the glass-transition temperature Tg to around the onset of crystallization. The evolution of microstructures arising from isothermal annealing was investigated by X-ray diffraction (XRD) and (high-resolution) transmission electron microscopy ((HR)TEM). XRD spectra showed that, after the sample was annealed at a sub-Tg temperature, its first diffraction peak was split into two overlapping broad peaks. TEM analysis revealed the formation of a spherical, particle-like glassy phase embedded in the glassy matrix together with a finely connected network morphology within both. Combining these observations with compositional analysis suggested that phase separation had taken place during sub-Tg annealing. When the glassy alloy was annealed at temperatures higher than Tg, nanocrystalline structures, composed of Pd3Si and Pd phases plus a Pd9Si2 phase with a lamellar structure, was formed.

    Original languageEnglish
    Pages (from-to)677-686
    Number of pages10
    JournalPhilosophical Magazine Letters
    Volume87
    Issue number9
    DOIs
    Publication statusPublished - 2007 Sep 1

    ASJC Scopus subject areas

    • Condensed Matter Physics

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