About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Interrelated Extremes in Materials Degradation for Fission and Fusion Environments
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| Presentation Title |
He Ion Irradiation Induced Defect Evolution and Micromechanical Response of W |
| Author(s) |
Adil Wazeer, Yinghang Liu, Chang Xia, Ke Xu, Debargha Paul, Vaibhav Singh, Yongqiang Wang, Matthew Ryan Chancey, Tim Graening, Xiao-Ying Yu, Haiyan Wang, Xinghang Zhang |
| On-Site Speaker (Planned) |
Adil Wazeer |
| Abstract Scope |
Understanding radiation tolerance and high-temperature performance of tungsten (W) is critical for its deployment in nuclear fusion environments, where intense helium (He) implantation from the plasma significantly alters near-surface microstructure. In this study, pure W was subjected to He ion irradiation at elevated temperature to simulate reactor-relevant helium exposure conditions. TEM investigations revealed pronounced defect evolution with increasing fluence, including the nucleation and growth of He bubble and bubble coalescence. The presence of helium-stabilized vacancy clusters led to distinct microstructural features compared to displacement-dominated irradiation, highlighting the strong role of He–defect interactions. To evaluate the mechanical implications of helium-induced damage, in-situ SEM micropillar compression tests were performed on both He-irradiated pillars. The results demonstrate significant changes in deformation behavior and altered strain localization, governed by bubble-dislocation interactions and thermal activation processes.
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| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Nuclear Materials, |