About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
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Presentation Title |
Revealing Hidden Defects via Stored Energy Measurements of Radiation Damage |
Author(s) |
Charles A. Hirst, Fredric Granberg, Penghui Cao, Scott Middlemas, R. Scott Kemp, Ju Li, Kai Nordlund, Michael Short |
On-Site Speaker (Planned) |
Charles A. Hirst |
Abstract Scope |
Seeing might be believing, provided that a characterization technique can resolve the defects of interest. For radiation damage the smallest and most numerous defects are below the resolution limit of transmission electron microscopy (TEM). Instead of spatial characterization, we propose to detect defects through their excess energy. Differential scanning calorimetry (DSC) measurements of neutron-irradiated Ti reveal two energetically-distinct processes during stage V annealing. Molecular dynamics (MD) simulations reveal the defects responsible, and show that the point defect-induced glide of dislocation loops contributes significantly to recovery. In-situ TEM heating studies will be conducted to validate this mechanism. In comparison to prior literature, our experiments measure defect densities that are over 4 times greater than those determined using TEM. Accurately characterizing these ‘hidden’ defects is crucial to understanding damage and annealing mechanisms at higher length scales, and to quantifying the stability of materials to radiation damage. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Characterization, Titanium |