| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
|
| Presentation Title |
Grain Boundaries Govern Plastic Deformation Kinetics in Nanocrystalline FCC Metals |
| Author(s) |
Yin Zhang, Kunqing Ding, Sandra Stangebye, Olivier Pierron, Joshua Kacher, Ting Zhu |
| On-Site Speaker (Planned) |
Yin Zhang |
| Abstract Scope |
Stress relaxation experiments and associated activation volume measurements represent one of the most effective ways of elucidating the strength/rate-controlling mechanisms governing the plastic deformation kinetics of polycrystalline metals and alloys. This approach has been well established in the study of conventional coarse-grained materials, and it has been recently extended to study ultra-fine grained and nanocrystalline metals. However, the currently available results of activation volumes for ultra-fine grained and nanocrystalline metals are limited and, more importantly, puzzling. Here, we conduct the atomistic calculations of activation volumes utilizing free-end nudged elastic band method. Combined with in situ TEM experiments and stress relaxation measurements in Au and Al, we determine the governing deformation mechanisms in nanocrystalline FCC metals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Mechanical Properties |