About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
On the distribution of stacking faults at dissociated medium-angle grain boundaries: crystallographic geometry and metastability |
| Author(s) |
Alejandro Hinojos, Daniel E Vizoso, David P Adams, Remi Dingreville, Douglas L Medlin |
| On-Site Speaker (Planned) |
Alejandro Hinojos |
| Abstract Scope |
Grain boundaries in FCC metals with low stacking fault energy can form in configurations composed of arrays of stacking faults. Here, through a combination of atomic-resolution electron microscopy, atomistic simulations, and dislocation theory we investigate 9R stacking at boundaries vicinal to Σ33a, since its misorientation (20.05°) lies in the medium angle regime, just beyond the limit for low-angle boundaries, motivating questions for how best to describe it in terms of dislocations. HAADF-STEM observations of dissociated boundaries all fall within a narrow range of inclinations, a result explored through atomistic models of the dislocation arrangements at the interface. Finally, we investigate variations in the stacking fault distribution, quantifying the experimental images and using atomistic simulations to interrogate the energetic landscape associated with interfacial states resulting from these stacking variations. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Computational Materials Science & Engineering, |