| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
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Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments V
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| Presentation Title |
Characterization of Radiation Damage in Nanocrystalline Ni- and Fe-Based Oxide Dispersion-Strengthened Alloys |
| Author(s) |
Zachary Stenstrom, Shengze Yin, Ondrej Muransky, Levente Balogh |
| On-Site Speaker (Planned) |
Zachary Stenstrom |
| Abstract Scope |
Nanocrystalline (NC) alloys exhibit improved resistance to radiation-induced degradation compared to Coarse-Grained (CG) alloys due to their larger grain boundary area and higher dislocation density microstructural features which act as sinks for point-defects reducing the formation of irradiation defects. This study uses a Ni-based superalloy (Inconel 617) and two Oxide Dispersion-Strengthened (ODS) alloys (Ni-based MA754 and Fe-based MA957) processed by High-Pressure Torsion (HPT) to experimentally validate approaches to maximize radiation tolerance and explore defect interactions affecting irradiation-induced microstructural evolution. High-resolution synchrotron X-ray Diffraction (XRD) shows high dislocation densities and small crystallite sizes in these samples, in the magnitude of ~10^16 m^-2 and ~50 nm, respectively. Post-irradiation XRD indicates a reduction in dislocation density and slight crystallite growth, suggesting athermal irradiation-induced dislocation annihilation mechanisms. Further studies involving Transmission Electron Microscopy (TEM) and mechanical testing will be carried out to better understand the microstructure-mechanical property relations of ODS nano-alloys under irradiation. |