On the new criterion to assess the glass-forming ability of metallic alloys

Zhilin Long, Guoqiang Xie, Hongqing Wei, Xuping Su, Jian Peng, Ping Zhang, Akihisa Inoue

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    55 Citations (Scopus)


    Based on the analysis of time-temperature-transformation (TTT) diagrams of glass-forming liquids using the fragility concept, a dimensionless criterion ω, expressed by Tg/Tx - 2Tg/(Tg + Tl) (Tg the glass transition temperature, Tx the onset crystallization temperature and Tl the liquidus temperature), is proposed for quickly evaluating the glass-forming ability (GFA) of metallic glasses. From the available experimental data reported in the literature, the criterion ω exhibits the strongest correlation with the critical cooling rate Rc for glass formation among all currently available GFA indicators, including Trg(=Tg/Tl), ΔTx(=Tx - Tg), ΔTrg(=(Tx - Tg)/(Tl - Tg)), δ(=Tx/(Tl - Tg)), γ(=Tx/(Tg + Tl)), γm(=(2Tx - Tg)/Tl), φ(=Trg(ΔTx/Tg)0.143), α(=Tx/Tl), β(=Tx/Tg + Tg/Tl), β(=Tx × Tg/(Tl - Tx)2) and ζ(=Tg/Tl + ΔTx/Tx). An empirical equation is induced to elucidate the Rc in different metallic alloys based on the measured ω value of the corresponding alloy. It is also demonstrated that this ω criterion has a strong ability to measure or/and predict the GFA of cryoprotectants and oxide glasses, especially in the case of cryoprotectants.

    Original languageEnglish
    Pages (from-to)23-30
    Number of pages8
    JournalMaterials Science and Engineering A
    Issue number1-2
    Publication statusPublished - 2009 May 25


    • Criterion
    • Glass-forming ability
    • Metallic glasses
    • Thermal analysis

    ASJC Scopus subject areas

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


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