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

Damien Vandembroucq (1, 2) , Thierry Deschamps (3) , Camille Coussa (3) , Antoine Perriot (1) , Etienne Barthel (1) , Bernard Champagnon (3) , Christine Martinet (3)

1 SVI - Surface du Verre et Interfaces
2 PMMH - Physique et mécanique des milieux hétérogenes (UMR 7636)
3 LPCML - Laboratoire de Physico-Chimie des Matériaux Luminescents

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.

Mots clés: silica; glass; plasticiy; densification; hardening

Domaines: Autre [cond-mat.other]

Damien Vandembroucq, Thierry Deschamps, Camille Coussa, Antoine Perriot, Etienne Barthel, et al.. Density hardening plasticity and mechanical aging of silica glass under pressure: A Raman spectroscopic study. Journal of Physics: Condensed Matter, 2008, 20, pp.485221. ⟨10.1088/0953-8984/20/48/485221⟩. ⟨hal-00258599v3⟩