Aging and rejuvenation during elastostatic loading of amorphous alloys

Abstract

Using molecular dynamics simulations, we investigate the effect of uniaxial elastostatic compression on the potential energy, structural relaxation, and mechanical properties of binary glasses. We consider the three-dimensional Kob-Andersen binary mixture, which was initially cooled from the liquid state to the glass phase with a slow rate at zero pressure. The glass was then loaded with a static stress at the annealing temperature during extended time intervals. It is found that the static stress below the yielding point induces large-scale plastic deformation and significant rejuvenation when the annealing temperature is smaller than a fraction of the glass transition temperature. By contrast, aging effects become dominant at sufficiently small values of the static stress and higher annealing temperatures. The mechanical tests after the elastostatic compression have shown that both the elastic modulus and the yield stress decrease in rejuvenated samples, while the opposite trend was observed for relaxed glasses. These results might be useful for the thermomechanical processing of metallic glasses with optimized mechanical properties.

arXiv comment21 pages, 8 figures

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Cited by in corpus (12)

• Accelerated relaxation in disordered solids under cyclic loading with alternating shear orientation
• The effect of thermal history on the atomic structure and mechanical properties of amorphous alloys
• Shear band formation in amorphous materials under oscillatory shear deformation
• Structural relaxation in amorphous materials under cyclic tension-compression loading
• Spatiotemporal analysis of nonaffine displacements in disordered solids sheared across the yielding point
• Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions
• Alternating shear orientation during cyclic loading facilitates yielding in amorphous materials
• Accessing a broader range of energy states in metallic glasses by variable-amplitude oscillatory shear
• A delayed yielding transition in mechanically annealed binary glasses at finite temperature
• Cooling under applied stress rejuvenates amorphous alloys and enhances their ductility
• Relaxation dynamics in amorphous alloys under asymmetric cyclic shear deformation
• Shear band healing in amorphous materials by small-amplitude oscillatory shear deformation