| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Screw Dislocation Transmission Across the Σ3{112} Twin Boundary in Face Centered Cubic Copper |
| Author(s) |
Tengfei Ma, Nithin Mathew, Lei Cao, Abigail Hunter |
| On-Site Speaker (Planned) |
Tengfei Ma |
| Abstract Scope |
Previous research has revealed the atomic structure of the Σ3{112} incoherent twin boundaries (ITB). In this study, the transmission of a full screw dislocation across the Σ3{112} ITB in Cu is simulated both in mesoscale and atomic scale. A 3D phase-field dislocation dynamics (PFDD) model is applied to simulate the transmission behavior and the molecular dynamics (MD) simulation is performed to validate the PFDD model. The results show that both MD and PFDD can predict similar transmission behavior. Under an external applied shear stress, the full screw dislocations will first dissociate into leading and trailing partials and then the leading partial will transmit across the Σ3{112} ITB while the trailing partial will be captured by the boundary. The critical stress required for the screw dislocation transmission is calculated from MD and PFDD simulations. PFDD will predict a slightly lower critical stress compared with the MD simulations. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |