| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
|
| Presentation Title |
Unfaulting of Dislocation Loops in Metals: Atomistic Simulations and Continuum Modeling |
| Author(s) |
Cheng Chen, Jun Song |
| On-Site Speaker (Planned) |
Cheng Chen |
| Abstract Scope |
Dislocation loops are important secondary defects produced in metals subjected to irradiation and large deformation, playing a critical role in subsequent microstructure and damage evolution in the material. Here, the unfaulting of single and multi-layer dislocation loops in metallic systems have been investigated through atomistic simulations combining continuum modeling. A versatile approach accounting for atom insertion/removal and displacement field was developed, able to construct single and multi-layer loop structures of arbitrary geometries. The unfaulting mechanisms and dislocation reaction intermediates in different unfaulting scenarios were clarified. Critical conditions necessary for unfaulting have been identified, and analytical models have been developed to accurately predict these conditions. Various loop morphologies observed in experiments have been accurately reproduced, with the underlying dislocation reactions fully clarified. The present work provides important mechanistic insights to address key knowledge deficits regarding dislocation loop unfaulting, essential for better understanding of deformation and irradiation-induced damages in structural metals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, Characterization |