| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Multiscale Simulation of the Dislocation-interface Reactions: Methodology, Mechanisms, and Applications |
| Author(s) |
Liming Xiong, Youping Chen |
| On-Site Speaker (Planned) |
Liming Xiong |
| Abstract Scope |
Many engineering materials contain a high density of interfaces. When they are deformed, the interaction between dislocations and interfaces dictate the microstructure evolution and in turn, their overall performance. A dislocation-interface reaction is multiscale in nature because the atomic structure at the interface together with the long-range stress field induced by a dislocation accumulation at the interface determine the subsequent local structure change. Here we expand our previous concurrent atomistic-continuum method to (i) characterize the local stress ahead of a µm-level dislocation pileup; and (ii) identify its role in a dislocation pileup-induced phase transformation, twinning, and fracture. Taking bi-crystalline and multilayered metallic materials as examples, the main mechanisms responsible for a local stress-controlled structure changes during a dislocation-interface reaction are revealed. Our results elucidate the discrepancies between atomistic simulations and experimental observations, and highlight the importance of probing this problem using a concurrent multiscale method. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |