| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
G-10: Investigation of Grain Boundary and Dislocation Interactions Through In-situ TEM MEMS-based Tensile Nanomechanical Testing of Ultrafine Grained Gold Thin Films |
| Author(s) |
Sandra Stangebye, Saurabh Gupta, Yin Zhang, Joshua Kacher, Olivier Pierron, Ting Zhu |
| On-Site Speaker (Planned) |
Sandra Stangebye |
| Abstract Scope |
Due to the small average grain size and high-volume fraction of grain boundaries in ultrafine grained metals, grain boundaries play a crucial role in plastic deformation by acting as sites for nucleation of dislocations and as barriers to dislocation propagation. In this study, interactions between grain boundaries and dislocations in ultrafine grained gold thin films were investigated using a combination of quantitative in situ TEM nanomechanical testing, transmission Kikuchi diffraction (TKD), and atomistic simulations. Specifically, repeated stress relaxation tests were performed in situ on miniaturized dogbone samples and the physical activation volumes at different stages of deformation were found and related directly to the observed dislocation activity. These identified dislocation interactions were investigated in detail via atomistic simulations, providing greater insight into the atomic-scale mechanisms dictating the dislocation interactions. Results will be discussed in terms of the influence of grain and grain boundary characteristics on dislocation interactions. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |