Temperature width, liquid fragility, and onset crystallization viscosity for supercooled liquid of metallic glasses

Abstract

The correlation of supercooled liquid region width (∆T_x) with the reduced glass transition temperature (T_rg), critical cooling rate (R_c) and liquid fragility index (m) for metallic glasses (MGs) are analyzed, the negative correlation between ∆T_x and m is demonstrated for the summarized MGs. To deeply study the underlying nature, the onset crystallization viscosity (η^M(T_x)) for a variety of glass forming systems are calculated and compared. The results show that η^M(T_x) displays system-specific, and each system crystallizes at one neighboring viscosity except a few cases which is attributed to crystallization process. Moreover, η^M(T_x) is found to be related to the stability and glass forming ability of different MGs.