| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Dynamic Behavior of Materials X
|
| Presentation Title |
Simulating Plastic Flow Near Grain Boundaries with Dislocation Dynamics |
| Author(s) |
Mujan N. Seif, Fengxian Liu, Edmund Tarleton |
| On-Site Speaker (Planned) |
Mujan N. Seif |
| Abstract Scope |
The generation, motion, and structure of dislocations within a crystal lattice is the origin of plasticity in metals. To better predict the progression of plastic deformation in a metal polycrystal, it is crucial to consider the dislocation-based micro-mechanisms operating at grain boundaries. Here, we highlight two features critical for accurate representations of mesoscale deformation: grain size and misorientation. Utilizing a nodal dislocation dynamics framework (DD), we simulate plastic flow within an isolated domain containing two bcc iron crystals separated by an impenetrable boundary under a ramped compressive stress. We compute the critical resolved shear stress at the boundary as well as the distribution of stress within each crystal as a function of crystal size and dominant slip systems. These results emphasize the strength of DD as a tool for modeling complex, dynamic grain boundary interactions and as a powerful complement to classic experimental micromechanics techniques like coupled indentation and EBSD. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Computational Materials Science & Engineering, Modeling and Simulation |