Influence of oscillatory shear on nucleation in metallic glasses: A molecular dynamics study

The process of crystal nucleation can be accelerated or retarded by ultrasonic vibration, which is particularly attractive for the addictive manufacture and thermoplastic forming metallic glasses, however, effect mechanism oscillatory loading on are still elusive. Here, using molecular dynamics simulation, changes in time–temperature-transformation (TTT) curve under external systematically investigated two typical binary alloys. A glass ability dependent response to found, shortest incubation time insensitive loading, while corresponding temperature significantly shifted. Within framework classical theory, a fitting formula proposed describe simulation data quantitatively. In contrast stationary shear, elastic stress, rather than strain rate, key parameter control evolution TTT loading. Furthermore, model shows that decouple mobility deeply supercooled liquid, hence deformation enhanced suppressed, helpful manufacturing glasses.