| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
Dislocation Dominated Plasticity at the Nanometer |
| Author(s) |
Darcy Anne Hughes |
| On-Site Speaker (Planned) |
Darcy Anne Hughes |
| Abstract Scope |
The evolution of dislocation structures formed during deformation of fcc and bcc metals and alloys was investigated. This investigation encompasses crystallite length scales from 10,000 to below 5nm; and deformation modes that range from dry sliding that introduces gradients of stress and strain to other constrained deformation modes including rolling and wire drawing. These quantified structures are analyzed within a universal framework of grain subdivision. Statistical and universal scaling analyses of deformation induced high angle boundaries, dislocation boundaries, and individual dislocations observed by high resolution electron microscopy (HREM) reveal that dislocation processes still dominate below 5 nm. Key elements that promote dislocation activity and structural refinement are discussed. A new scaling law connects the microstructural evolution of measured structural parameters. In turn those structural parameters are related to strength parameters that predict the flow stress utilizing a linear addition of the classical Taylor and Hall-Petch formulations. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |