Microstructure feature of bulk glassy Cu60Zr30Ti10 alloy in as-cast and annealed states

Yantang Chen, Tao Zhang, Wei Zhang, Dehai Ping, K. Hono, Akihisa Inoue, Toshio Sakurai

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    39 Citations (Scopus)

    Abstract

    The microstructures of a bulk glassy Cu60Zr30Ti10 alloy in as-cast state and annealed at glass transition temperature (Tg), i.e., 440°C, have been studied using an electron transmission microscope (TEM) and a high-resolution transmission electron microscope (HRTEM). Nanocrystals with a size of 4 nm were observed in the cast rod with a diameter of 4 mm. The nanocrystal was determined to be CuZr, which is primitive cubic structure with a lattice parameter of a = 0.3262 nm by analyzing its nano-beam electron diffraction pattern, suggesting that such nanocrystals have a positive effect on mechanical properties. Obviously distinguished interval dark and bright regions were observed in the glassy Cu60Zr30Ti10 alloy annealed for 10 min at Tg. Nanocrystalline phase with a size of ∼ 10 nm was recognized after the annealing treatment. The concentration distribution of Cu, Zr and Ti in the alloy annealed for 10 min at Tg was examined with a three-dimensional atom probe field ion microscopy (3DAP-FIM). It was found that the Cu and Zr elements fluctuated along depth direction while the Ti element remained almost unchanged. It is therefore interpreted that the annealing-induced nanocrystalline phase results from nucleation and growth at the sites of the Cu-rich and/or Zr-rich regions as well as from growth of the cast-in nanocrystals.

    Original languageEnglish
    Pages (from-to)2647-2650
    Number of pages4
    JournalMaterials Transactions
    Volume43
    Issue number10
    DOIs
    Publication statusPublished - 2002 Oct

    Keywords

    • Anneal
    • Cast
    • Glass transition temperature
    • Glassy CuZrTi alloy
    • Microstructure

    ASJC Scopus subject areas

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

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