| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
The Role of Microstructure and Loading Parameters on Deformation Twinning in Nanocrystalline Mg at High Strain Rates |
| Author(s) |
Sergey Galitskiy, Garvit Agarwal, Avinash M Dongare |
| On-Site Speaker (Planned) |
Sergey Galitskiy |
| Abstract Scope |
Classical MD simulations are carried out to investigate the twinning/detwinning mechanisms in HCP Mg microstructures under high strain rate loading conditions. The role of grain size (varying from 25 to 100 nm), orientation, and strain rate (at order of 10^8 -10^9 s-1) is examined. Recently developed Extended-CNA method is utilized to characterize the type and volumetric evolution of twins. The analysis is performed for individual grains to understand the effects of grains orientation . The results suggest that twinning behavior is highly anisotropic under both tension and compression. In addition, low angle grains twin more easily under tensile loading, whereas high angle grains tend to twin under compression. MD simulations suggest that strain rate significantly affects the type, growth rate and volume fraction of twins. The role of grain size and strain rates of loading on the evolution of number and volume fractions of twins will be presented. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |