| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Inference-based Approaches for Material Discovery and Property Optimisation
|
| Presentation Title |
Exploring the Evolution of Irradiation-induced Defects Through Their Energetic Signatures |
| Author(s) |
Charles A. Hirst, Fredric Granberg, Boopathy Kombaiah, Penghui Cao, Scott Middlemas, R. Scott Kemp, Ju Li, Kai Nordlund, Michael Short |
| On-Site Speaker (Planned) |
Charles A. Hirst |
| Abstract Scope |
Accurate prediction of a material’s properties relies on the comprehensive characterization of all defects within. Yet for irradiated metals the smallest and most numerous defects are unable to be imaged in TEM. Instead of spatial characterization, defects can be detected and quantified through their excess energy. Differential scanning calorimetry (DSC) experiments of neutron-irradiated Ti measure defect densities that are 3 times greater than those determined using TEM. Two energetically-distinct annealing processes are also observed where the established recovery model predicts only one. Comparing calorimetry experiments to molecular dynamics (MD) simulations reveals the mechanism of recovery with dislocation loops gliding through the material, annihilating defects in their path. Positron annihilation spectroscopy (PAS) and XRD experiments will be used to validate the proposed mechanism. Through a combination of multiple techniques the evolution of irradiation-defects can be deduced, demonstrating the power of inference-based approaches to probe radiation damage at the atomic scale. |