|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Irradiation Behavior of Mechanically Processed Zr-Nb Multilayers at Very High Doses
||Madhavan Radhakrishnan, Daniel Savage, Marko Knezevic, John Watt, Yongqiang Wang, Katherine Jungjohann, Nathan Mara, Osman Anderoglu
|On-Site Speaker (Planned)
Past studies have showed that PVD-processed multilayers provide enhanced radiation damage resistance owing to large fraction of interfaces. This work investigates the radiation resistance of bulk nanolayered zirconium-niobium composites exposed to very high doses. Three Zr/Nb multilayers with individual layer thicknesses of 15 nm, 45 nm, 90 nm were synthesized by accumulative roll-bonding process. Micro-Vickers hardness values follow a Hall-Petch strengthening trend with layer thickness. The multilayers were subjected to a self-ion irradiation with 7 MeV Zr2+ ion beam at 500°C. Irradiation caused a maximum dose of ~82 dpa at a depth of 1.5 μm. Cross-sectional TEM examination indicates that, in all multilayers, heavy dose ion-irradiation has induced a heterogeneous fragmentation of Zr, Nb layers and a chemically homogeneous mixed layer beneath the irradiated surface. The extent of sub-surface microstructural changes in multilayers correlates with the SRIM profile. Here, we report the correlation between layer thicknesses and evolution of radiation microstructures and mechanical property during irradiation.