Peculiarities of structure and hardening of Ni-Ti alloy surface layers formed by 84Kr15+ ions irradiation at 147 MeV energy at high temperatures

Abstract

The consistent patterns of changes in nanostructure and nanohardness of Ni-Ti alloy after irradiation with 84Kr15+ ions with 147 MeV energy to the fluence of 1·1019 m-2 at 250 and 3000C temperatures depending on phase composition have been experimentally studied. It was shown that significant (44 – 94%) softening of surface layers for the single-phase and two-phase Ni-Ti alloys is connected with the formation of bubble nanostructured defects and complete sputtering of the process layers. The role of nanostructure in roughness of the irradiated Ni-Ti alloy surface of various phase composition has been established.