| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
| Presentation Title |
Role of Stacking Fault Energy in the Interaction of Extended Dislocations with Nanovoids |
| Author(s) |
Ashley Roach, Shuozhi Xu, Darby Luscher, Daniel Gianola, Irene J Beyerlein |
| On-Site Speaker (Planned) |
Ashley Roach |
| Abstract Scope |
Voids are prolific in structural metals, ranging from nanometers to micrometers in diameter. On the nanoscale voids act as dislocation obstacles, increasing shearing stress and strengthening the metal. Phase Field Dislocation Dynamics (PFDD), an intermediate length-scale model, is rich in physics with discrete dislocations that evolve simultaneously with voids, while allowing for cell sizes relevant to part performance. Void strengthening and the influences of void size, void spacings, and material properties are investigated, with focus on stacking fault energy (SFE) for dislocations in fcc, which dissociate into Shockley partials. The critical stress for a dislocation to bypass a given void obstacle was tracked, which is related to bulk material yielding. In addition, dislocation bypassing behaviors and mechanisms were studied with climb and cross slip excluded. A linear trend between void fraction and obstacle strength was observed, bucking previously predicted trends from literature and any anticipated size effects at the nanoscale. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, |