Theory of pressure-induced rejuvenation and strain-hardening in metallic glasses

Abstract

We theoretically investigate high-pressure effects on the atomic dynamics of metallic glasses. The theory predicts compression-induced rejuvenation and the resulting strain hardening that have been recently observed in metallic glasses. Structural relaxation under pressure is mainly governed by local cage dynamics. The external pressure restricts the dynamical constraints and slows down the atomic mobility. In addition, the compression induces a rejuvenated metastable state (local minimum) at a higher energy in the free energy landscape. Thus, compressed metallic glasses can rejuvenate and the corresponding relaxation is reversible. This behavior leads to strain hardening in mechanical deformation experiments. Theoretical predictions agree well with experiments.

References in corpus (11)

• Deformation and Failure of Amorphous Solidlike Materials
• Elastically Cooperative Activated Barrier Hopping Theory of Relaxation in Viscous Fluids. I. General Formulation and Application to Hard Sphere Fluids
• Elastically Cooperative Activated Barrier Hopping Theory of Relaxation in Viscous Fluids. II. Thermal Liquids
• Unified Theory of Activated Relaxation in Liquids over 14 Decades in Time
• Interatomic repulsion softness directly controls the fragility of supercooled metallic melts
• Long-lived neighbors determine the rheological response of glasses
• Glassy Dynamics Under Superhigh Pressure
• Microscopic origin of nonlinear non-affine deformation and stress overshoot in bulk metallic glasses
• Effects of Cooling Rate on Structural Relaxation in Amorphous Drugs: Elastically Collective Nonlinear Langevin Equation Theory and Machine Learning Study
• Theory of Activated Glassy Dynamics in Randomly Pinned Fluids
• Coupling between structural relaxation and diffusion in glass-forming liquids under pressure variation

Cited by in corpus (5)

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• Impact of high pressure on reversible structural relaxation of metallic glass
• Screening and collective effects in randomly pinned fluids: A new theoretical framework