About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Microstructure-Sensitive Modeling Across Length Scales: An MPMD/SMD Symposium in Honor of David L. McDowell
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| Presentation Title |
Understanding Dislocation Movement and Interaction With Twin Boundaries in Beta-Sn |
| Author(s) |
John W. Israel, Vinamra Agrawal, Ian W. Chesser, Khanh Q. Dang |
| On-Site Speaker (Planned) |
John W. Israel |
| Abstract Scope |
Grain boundaries (GBs) and twin boundaries (TBs) play a critical role in overall plastic deformation of materials as obstacles to dislocation slip. The deformation and strengthening mechanisms in beta-Tin (beta-Sn) are of significant interest due to the application of Sn-based alloys as solder materials. In this work, we study the interaction of dislocations and TBs in beta-Tin. Recent experiments on tetragonal beta-Sn have shown that dislocations absorb into TBs and form large steps, a potentially important strengthening method. Using a machine learned interatomic potential we perform molecular dynamics simulations to drive an edge dislocation into a TB. Our simulations show that the TB plays a crucial role in controlling dislocation movement. The interaction of the dislocation with the twin results in steps in the TB, stacking faults, and the eventual transmission of dislocations through the boundary. We quantify the results and compare them to experimental observations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Mechanical Properties |