About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
Characterization of Dislocations in Shape Memory Alloy Using Large Scale MD Simulation |
Author(s) |
David Enrique Farache, Shivam Tripathi, Alejandro Strachan |
On-Site Speaker (Planned) |
David Enrique Farache |
Abstract Scope |
Shape memory alloys are of interest in various applications due to their ability to revert to their original shape after large deformations. This effect and superplasticity are governed by a solid-state diffusion-less transformation. Molecular dynamics (MD) simulations have provided an atomic-level picture of the underlying processes but efforts to date focused on defect-free crystals. We characterize the effect of dislocations on the temperature and stress-induced martensitic transformations via large-scale MD. The simulations reveal the impact of line defects on the nucleation and propagation of the martensitic and austenitic transformations as well as in the resulting microstructure, including austenite twins. The simulations also provide insight into the change in martensite start temperatures with sample deformation observed experimentally. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Phase Transformations, |