|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Nanostructured Materials for Nuclear Applications
||In-situ Transmission Electron Microscopy/Irradiation Studies on Nanocrystalline Iron: Defect Density, Denuded Zone Formation and Grain Boundary Structure
||Osman El-Atwani, Asher Leff, James Nathaniel, J.Kevin Baldwin, Brittany Muntifering, Khalid Hattar, Mitra L Taheri
|On-Site Speaker (Planned)
Among the novel solutions to mitigate irradiation damage on nuclear materials is the use of nanocrystalline (NC) metals due to their large grain boundary area that presumably act as defect (eg. Interstitials and vacancies) and particle (eg. Helium) sinks and improve the material mechanical properties. In this study, we investigate the performance of freestanding nanocrystalline iron (<100nm grain size) under low energy He, in situ in a transmission electron microscope (TEM). Defect density and evolution vs grain size and orientation for low energy He-irradiated nanocrystalline iron are reported. In addition, bubble formation on iron was compared with Ni (FCC model material) under similar conditions. Denuded zone evolution and formation are investigated. Effect of defect absorption on grain boundary structure is studied through in-situ irradiation/Crystallographic orientation microscopy (ACOM) experiments. These findings provide fundamental understanding of the role of grain boundaries in a nanocrystalline material as a move toward radiation tolerant nanomaterials.
||Planned: A print-only volume