| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Dislocation Drag at Ultra-High Strain Rates Up to 109 s-1 |
| Author(s) |
Qi Tang, Jianxiong Li, Mostafa Hassani |
| On-Site Speaker (Planned) |
Mostafa Hassani |
| Abstract Scope |
With increasing deformation rates, the thermally activated dislocation glide gives way to a continuous glide of dislocations influenced by their interactions with phonons. Understanding dislocation-phonon drag is critical for designing materials for extreme conditions but remains largely qualitative due to the difficulty of quantifying deformation at ultra-high rates. Here, we develop an impression-based approach combining laser-induced microprojectile impact and spherical nanoindentation to study the dislocation drag regime. We leverage the similar deformation length scales and geometries, but mechanistic differences in microprojectile impact and spherical nanoindentation to isolate the contribution of dislocation—phonon drat at ultrahigh strain rates to plastic deformation. We also develop a theoretical framework that enables precise quantification of the dislocation-phonon drag regime. We apply this approach to Cu alloys and discuss the microstructure dependency of the dislocation drag behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Copper / Nickel / Cobalt, Modeling and Simulation |