Abstract

Based on the thermodynamic fragility model, a new parameter (Sσ/kB)/M is proposed to evaluate the glass-forming ability (GFA) of metallic glasses, where M and Sσ/kB are the fragility of the superheated melts and the mismatch entropy normalized by the Boltzmann constant, respectively. A positive relationship between (Sσ/kB)/M and glass forming ability is observed for both bulk metallic glasses and marginal metallic glasses, and an eutectic alloy with (Sσ/kB)/M larger than 0.17 can be selected as a bulk glassy forming candidate. As most alloys can obtain the temperature dependence of viscosity above liquidus temperature, (Sσ/kB)/M can be used as a prediction parameter for high GFA. Although both high and low M values can work in determining GFA, the high GFA of bulk metallic glasses is primarily due to the large mismatch entropy (Sσ/kB>0.17).

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