Glass-forming ability and fragility parameter of amorphous Fe67Co9.5Nd3Dy0.5B20

Abstract

The glass-forming ability of amorphous Fe67Co9.5Nd3Dy0.5B20 has been analyzed in terms of the width of the supercooled liquid region, the reduced glass transition temperature, the recently proposed parameter γ, the Hruby parameter [Czech. J. Phys., Sect. B 22, 1187 (1972)] Kgl, and the stability parameter S. The lack of a high glass-forming ability for this alloy cannot be predicted by these parameters. The glass-forming ability is also discussed with respect to the fragility parameter calculated from the dependence of the glass transition on the heating rate described by the Vogel-Fulcher-Tamman relation. The value of the fragility parameter indicates that this alloy is closer to the fragile side than the strong side in the frame of the classical scheme of glass-forming liquids, revealing that the fragility parameter can be reliably used to predict the glass-forming ability for this alloy rather than other well-known empirical parameters.