| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
An Atomistic-to-microscale Computational Analysis of the Dislocation-interface Reaction and the Subsequent Structure Changes in Two-phase Materials under Compression and Shear |
| Author(s) |
Liming Xiong |
| On-Site Speaker (Planned) |
Liming Xiong |
| Abstract Scope |
Taking a two-phase material under compression and shear as a model system, here we perform an atomistic-to-microscale computational analysis on how a dislocations pileup is formed at the interface and how it contributes to the subsequent structure changes, such as twinning and phase transformations (PTs), through concurrent atomistic-continuum simulations. One main novelty of this work is a simultaneous resolution of the μm-level dislocation slip, the internal stress complexity, the atomic-level step formation, twinning/PT nucleation and growth near the slip-interface intersection all in one model. The dislocation pileup-induced local stress concentration is found to dictate the subsequent structure evolution: (a) a simultaneous occurrence of twinning and PTs; and (c) a 60% reduction of the PT pressure when tens of dislocations are piled up at the buried interface. The gained knowledge may find applications in understanding the dislocation slip, twinning, PTs and their interaction in many advanced alloys under plastic deformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Modeling and Simulation, Computational Materials Science & Engineering |