Density hardening plasticity and mechanical aging of silica glass under pressure: A Raman spectroscopic study

Abstract

In addition of a flow, plastic deformation of structural glasses (in particular amorphous silica) is characterized by a permanent densification. Raman spectroscopic estimators are shown to give a full account of the plastic behavior of silica under pressure. While the permanent densification of silica has been widely discussed in terms of amorphous-amorphous transition, from a plasticity point of view, the evolution of the residual densification with the maximum pressure of a pressure cycle can be discussed as a density hardening phenomenon. In the framework of such a mechanical aging effect, we propose that the glass structure could be labelled by the maximum pressure experienced by the glass and that the saturation of densification could be associated with the densest packing of tetrahedra only linked by their vertices.

References in corpus (8)

• Dynamics of Viscoplastic Deformation in Amorphous Solids
• Amorphous Systems in Athermal, Quasistatic Shear
• Fragile-to-strong transition and polyamorphism in the energy landscape of liquid silica
• Superdense Crystal Packings of Ellipsoids
• Molecular structural order and anomalies in liquid silica
• Universal Breakdown of Elasticity at the Onset of Material Failure
• Signature of small rings in the Raman spectra of normal and compressed amorphous silica: A combined classical and ab initio study
• Phase diagram of silica from computer simulation

Cited by in corpus (4)

• Modeling the mechanics of amorphous solids at different length and time scales
• Strain localization and anisotropic correlations in a mesoscopic model of amorphous plasticity
• From depinning transition to plastic yielding of amorphous media: A soft modes perspective
• The Anomalous Yield Behavior of Fused Silica Glass