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Glass Forming Ability of Metallic Glasses Evaluated by a New Criterion

The glass-forming ability (GFA) of Cu–Zr binary alloys is evaluated using the existing criteria based on calori-metric parameters, and poor relations are found. Therefore, another parameter Trk defined as Tk/Tl, in which Tk is the Kauzmann temperature and Tl the equilibrium liquidus temperature, is proposed. It exhibits good agreements with the experimental data of the Cu–Zr system and other representative bulk metallic glass formers so long as classifying them into strong or fragile category. It is suggested that kinetic effects are irrelevantly incorporated in the GFA analysis in the previous work.