Abstract
Based on the classical theory of nucleation, a new criterion ϖ, defined as (Tx−Tg)⋅Tg⋅Tx/(Tl−Tx)3 (where Tg, Tx and Tl are the glass transition temperature, the onset crystallization temperature and the liquidus temperature) and correlated to the critical casting diameter (Dmax), which has been proposed to evaluate the glass-forming ability (GFA) of bulk metallic glasses (BMGs). According to the linear fitting results of 667 reported BMGs, the relationship between Dmax and ϖ is expressed as Dmax=(1.08±0.26)+(10.22±0.45)ϖ. The interrelationship between the new criterion ϖ and Dmax exhibits better ability for evaluating GFA of the alloys than nine criteria reported in literature, and the values of Dmax of Fe-BMGs could be calculated by this ϖ parameter in an appreciable range. Therefore, the proposed ϖ parameter has certain significance for the development of new metallic glasses and the determination of their Dmax.
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