Abstract
Thin self-supporting samples of vitreous silica and Pyrex were homogeneously irradiated between 80 and 150 K with 20Ne, 58Ni and 129Xe ions of kinetic energy 3.5 MeV/u, 4.0 MeV/u, and 2.8 MeV/u, respectively. In the low fluence regime vitreous silica densities by about 3.0%. In spite of their brittleness both glasses exhibit macroscopically visible changes in sample dimensions in the high fluence regime and deform virtually in the same way as ductile metallic glasses. The effect is quantitatively interpreted as the consequence of plastic flow of the amorphous material in the wake of the projectiles due to electronic excitation and ionization.
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