| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2025: In-Situ Characterization Techniques
|
| Presentation Title |
Shock Compression Impact on Covalently-Bonded Materials |
| Author(s) |
Boya Li, Alex Li, Shiteng Zhao, Marc Meyers |
| On-Site Speaker (Planned) |
Boya Li |
| Abstract Scope |
Laser shock compression subjects materials to an extreme regime of high quasi-hydrostatic pressure and high strain rates under uniaxial strain condition. In ductile materials, plastic deformation is operated by dislocations, twinning, and phase transformations as the strain rate increases. Covalently bonded materials usually have higher Peierls-Nabarro stress, which makes dislocation activity difficult and triggers brittle fracture and amorphization in some cases. This process is preceded by the emission and propagation of a critical concentration of dislocations. The generation of defects as a deformation process releases the shear stress generated by shock compression. We analyzed the microstructures of shocked diamond, olivine, and perovskite via electron microscopes. Molecular dynamics simulations are employed to predict the defect evolution in these materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Phase Transformations |