| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
An Experimental-numerical Approach to Investigate Hydrogen Enhanced Localized Plasticity (HELP) |
| Author(s) |
S. Mohadeseh Taheri-Mousavi, Motomichi Koyama, Haxoue Yan, Jinwoo Kim, Benjamin Cameron, S. Sina Moeini-Ardakani, Ju Li, C. Cem Tasan |
| On-Site Speaker (Planned) |
S. Mohadeseh Taheri-Mousavi |
| Abstract Scope |
Hydrogen-lattice defect interactions play a key role in designing materials that can efficiently avoid its embrittling influences. Here, by using Electron Channelling Contrast Imaging (ECCI), hydrogen effects on surface dislocation patterns in a bulk specimen were visualized in a scanning electron microscope. On the other hand, the Grand Canonical Monte Carlo (GCMC) method hybridized with Molecular Dynamics (MD) simulations were utilized and the hydrogen-dislocation atomic interactions were simulated, to replicate the conditions in the experiments. Hydrogen atoms were dynamically exchanged between the ideal gas reservoir and the interstitial sites during GCMC steps, and the sample was relaxed in MD intervals. This experimental-numerical approach revealed that hydrogen segregation to grain boundaries leads to dislocation jumps which are, in some cases, two orders of magnitudes larger than those observed in previous studies. The origins of the underlying mechanisms will be presented in this talk. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |