A B S T R A C T A metallic glass (MG) annealed above its glass-transition temperature T g , and cooled, may show an enthalpy increase ΔH, and other property changes. The extent of this thermal rejuvenation depends on the state of the MG (represented by effective cooling rate Φ i ) and the post-anneal cooling rate Φ c . Previous studies examined effects of (Φ c /Φ i ) up to 10 2 . With a Au-based MG aged for up to 10 years at room temperature, and using fast calorimetry to anneal and then cool

more »

... up to 5000 K s − 1 , we extend (Φ c /Φ i ) to 10 7 . The rejuvenation is limited by anneal temperature or by Φ c , when, for all MGs, ΔH/T g shows a universal approximate scaling with log(Φ c /Φ i ). We detect decoupling of vitrification from α relaxation, and highlight limitations in the use of fictive temperature to characterize glassy states. Rejuvenation of the Au-based MG decreases its elastic modulus and hardness, extending trends reported for other MGs.