A new criterion for predicting glass forming ability of bulk metallic glasses and some critical discussions

A modified criterion, β', defined as T_g/T_x–T_g/(T_l·η) (T_g, T_x, T_l) and η denote the glass transition temperature, the onset of crystallization temperature, the liquidus temperature and constant coefficient, respectively), has been proposed for assessing the glass-forming ability (GFA) of bulk metallic glasses (BMGs). A survey of the readily available experimental data associated with the thermal analysis of various BMG alloys demonstrates that the new β' criterion exhibits much better correlation with the GFA than other currently used criteria. But, it is more significant from statistical results to note that, all criteria including the currently proposed criterion β', which are all combined by T_g, T_x and T_l, almost have equal ability in measuring the glass forming ability in any glass-forming system.