| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Size Effects in Dislocation-mediated Pore Growth |
| Author(s) |
Ashley Roach, Fulin Wang, Jungho Shin, Gyuseok Kim, Irene Beyerlein, Daniel Gianola, Darby Luscher |
| On-Site Speaker (Planned) |
Ashley Roach |
| Abstract Scope |
While pore growth is a crucial mechanism for spallation and ductile failure, continuum-scale models have limited predictive capabilities. Phenomenological plasticity models represent underlying deformation mechanisms for specific pre-determined environments and can’t capture size effects that may dominate at the micron-scale. Atomistic simulations reveal dislocation mechanisms mediating nano-scale pores, but with restrictive size and temporal limitations. We meet this multi-scale modeling challenge, marked by a gap between continuum and atomistic models, by designing a new “meso-scale” experiment, where deformation is sensitive to specific mechanisms and test specimen are large enough for detailed measurements. Thin film tensile specimen containing patterned pores of varying diameters are tested in-situ with transmission-SEM. Discrete dislocations can be readily observed while pore growth is quantified in relation to pore size, crystallographic orientation, proximity to grain boundaries, and applied load. To guide and interpret experiments, a CPFE-based pore growth model is employed to predict size and orientation effects. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |