About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
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Presentation Title |
Evolution of Microstructures in FeCr Binary Alloys Under Low-PKA Proton Irradiation |
Author(s) |
Siwei Chen, Yajie Zhao, Steven J Zinkle |
On-Site Speaker (Planned) |
Siwei Chen |
Abstract Scope |
Fe-Cr based ferritic steels are promising candidates for structural materials in advanced nuclear systems. To understand the mechanism of irradiation embrittlement with minimal ballistic dissolution, Fe-Cr binary model alloys (5-18 wt.% Cr) were irradiated by 800 keV protons (2 × 10-5 dpa/s dose rate) to 2 dpa in mid-range (3 μm) at 250-450 °C. The primary knock-on atom (PKA) yield by protons generates 3 Frenkel pairs on average. The microstructures have been investigated by transmission electron microscopy (TEM) and atom probe tomography (APT) techniques. Cr-rich α’ precipitates were examined by electron energy loss spectroscopy (EELS) and APT analysis. Correlative TEM-APT analysis was conducted to map Cr segregation on dislocation loop of the same area. Dislocation loops with a<001> and a/2<111> Burgers vectors varied with Cr composition and irradiation temperature. α’ precipitates trend to agglomerate with decreasing Cr composition. Quantitative analysis of the dislocation loops, cavities, and α’ precipitates are described. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Iron and Steel, Characterization |