|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Non-equilibrium Features of Grain Boundaries
||Effect of Neutron Irradiation on Deformation Homogeneity in Polycrystalline Materials
||Meimei Li, Xuan Zhang, Jonathan Almer, Jun-Sang Park, Hemant Sharma, Peter Kenesei
|On-Site Speaker (Planned)
Recent developments in synchrotron X-ray techniques have provided us unprecedented time and spatial resolution and in-situ capability with complex sample environments, shedding new light into the mechanisms and pathways of microstructural evolution and its correlation with material’s macroscopic behavior. Our recent study of neutron-irradiated Fe9Cr model alloy by high-energy X-ray diffraction microscopy (HEDM) revealed subgrain formation under tensile deformation and broader size distribution of subgrains in contrast to more uniform size distribution in the unirradiated specimen. The heterogeneous subgrain structure suggests that grain-scale homogeneity of plastic deformation can be significantly reduced by neutron irradiation. This 3D X-ray characterization of grains in polycrystalline bulk materials is paving the way to a better understanding of microstructural heterogeneity and localized deformation of irradiated materials, critical to the prediction of material aging and degradation and the design of irradiation-resistant new materials. An outlook of in-situ 4D characterization of irradiated materials will also be presented.
||Planned: Supplemental Proceedings volume