| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales IV
|
| Presentation Title |
Concurrent Atomistic-continuum Simulation of the Interplay between Dislocations, Phase Transformation, Twinning, and Reverse Phase Transformation in Plastically Deformed Materials |
| Author(s) |
Liming Xiong |
| On-Site Speaker (Planned) |
Liming Xiong |
| Abstract Scope |
Taking a two-phase material subjected to a plastic deformation as a model system, here we present results from a series of computational analysis on how a dislocations pileup is formed at the interface and how it contributes to the subsequent 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 interface structure relaxation, 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 mechanical loadings. |