Abstract
Previous work suggests that the size factor may be the most crucial one on the glass forming ability (GFA). But the alloys in a system have significant deference for GFA. A criterion λ n is defined in the present work to comprehensively evaluate concentration dependence of GFA of alloys in a system. It is found that the values of λ n of bulk glass formers with greatest GFA in Zr-, Pd-, Mg-, Nd- and Fe-based systems are nearly constant of 0.18. Based on the mathematical description of regular polytopes and the dense random packing of hard sphere (DRPHS) model, a cluster model is suggested. This model provides the physical meaningful origin of the λ n from the view of free volume. The glass structure of bulk glass formers with λ n ≈0.18 has optimum defect concentration within the framework of the cluster model. In the term of λ n criterion, an alloy with λ n of about 0.18 will be one of bulk glass former candidates, which is verified by the experimental result of ZrAlNi system.
Published Version
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