|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Kinetic Study on the Evolution of Nano-ceramic Coatings Under Heavy Ions Irradiation
||Matteo Vanazzi, Luca Ceseracciu, Gaelle Gutierrez, Celine Cabet, Marco G. Beghi, Fabio Di Fonzo
|On-Site Speaker (Planned)
Heavy ions in the KeV/MeV range are quite appropriate to simulate neutrons. Previously, we have reported on the evolution of amorphous alumina coatings under ions irradiation (up to 450 dpa) showing a general radiation-induced crystallization trend. Here, we concentrate on the low dpa, to evaluate the first stages of irradiation and to obtain neutrons-compatible data. Irradiations are performed at different temperatures, to decouple the thermal contribution from the radiation-induced effects. The evolution seems strictly temperature-dependent, with no structural changes at the lower temperature. At the higher levels, results show the formation of different crystals, depending on test conditions. A kinetic model for the grain growth is proposed, based on the experimental data. Mechanically, an evident size-effect is manifested. The formation of nano-crystalline domains increase rapidly the hardness, in accordance with the Hall-Petch model. Nevertheless, the hardening does not cause any brittleness, but it improves the mechanical properties of the material.