| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Atomistic Simulations Linked to Experiments to Understand Mechanical Behavior: A MPMD Symposium in Honor of Professor Diana Farkas
|
| Presentation Title |
Atomistic Simulations on the Dynamic Recrystallisation During High-Velocity Impact In Copper |
| Author(s) |
Yifeng Wang, Che Zhang, Christian Brandl |
| On-Site Speaker (Planned) |
Christian Brandl |
| Abstract Scope |
Dynamic recrystallisation (DRX) enhances mechanical properties and is usually associated with point-defect diffusion processes, as evident in the Zener-Hollomon parameter. DRX has been observed during single particle impact, where extreme strain rate and shock deformation processes suppress long-range diffusion.
The mechanisms of DRX during single particle impact are studied using large-scale molecular dynamics. A detailed spatiotemporal analysis of the defect evolution revealed the underlying dislocation-mediated mechanisms for DRX at high strain rates. As expected for shock deformation, the extreme stress conditions facilitated the nucleation and interaction of dislocations forming small angle grain boundaries. Subsequent nucleation of a predominant defect-free nanograin with a large angle misorientation with the matrix results in the annihilation of the stacking faults followed by grain growth during deformation. The implications of the observed DRX mechanism are discussed in the context of the cold spray process. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Additive Manufacturing |