Variation of hardness and modulus of borosilicate glass irradiated with Kr ions

Borosilicate glass has potential application for vitrification of high-level waste, which attracts extensive interest in studying their radiation durability. The NBS1 and NBS2 glasses were irradiated with 4 MeV Kr ions. The hardness and modulus of irradiated glasses were measured with a MTS G200 Nanoindenter device. With the increase of the irradiation, both the values of hardness and the modulus dropped and then saturated. The trend was consistent with previous studies, but the decay constants for the hardness of NBS1 and NBS2 were less than those in previous studies.