| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Dynamic Behavior of Materials X
|
| Presentation Title |
High-strain Rate Deformation Mechanisms in High Entropy Alloys as a Function of Tri-axial Load |
| Author(s) |
Chunyu Li, Saswat Mishra, Ethan Holbrook, Alejandro Strachan |
| On-Site Speaker (Planned) |
Chunyu Li |
| Abstract Scope |
While dislocation-based plasticity dominates the deformation of fcc alloys under most conditions, twinning, and dynamic recrystallization also play roles for certain loading conditions and alloys. The relative importance of these various mechanisms, the transitions between them, and underlying atomic-level processes are poorly understood, especially under dynamical loading conditions. We use large-scale molecular dynamics simulations to explore the deformation of several face-centered cubic alloys for strain rates ranging from 108 and 109 1/s and a family of tri-axial deformation paths. We observe a transition between a dislocation-dominated regime for uniaxial tension to a dominated by twinning and eventually re-crystallization as the deformation tri-axiality moves toward bi-axial tension. The simulations reveal how strain rate, stacking fault energy, and atomic-level fluctuations in high-entropy alloys, affect the transitions between regimes and underlying mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, High-Entropy Alloys, Mechanical Properties |