About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
3D In-Situ Characterization of Twin Boundary Evolution, Strain Heterogeneity, and Dislocation Accumulation in Mg–4Al Using Dark-Field X-Ray Microscopy |
| Author(s) |
Ashley N. Bucsek |
| On-Site Speaker (Planned) |
Ashley N. Bucsek |
| Abstract Scope |
Twin boundaries are highly mobile crystalline interfaces that play a central role in the deformation and microstructure evolution of magnesium alloys. However, the local evolution of elastic strain and defect accumulation near growing twin interfaces remains incompletely understood. Here, we use in-situ dark-field X-ray microscopy (DFXM) to characterize tensile-twin evolution in individual Mg–4Al grains during uniaxial loading. This approach enables 3D mapping of twin morphology, elastic lattice strain, and local misorientation from early twin formation through propagation and thickening. The measurements reveal heterogeneous elastic strain fields surrounding developing twin interfaces. Strain distributions evolve with twin growth and morphology changes: thin, partially propagated twins show strong strain asymmetry, while thicker, fully propagated twins exhibit greater strain relaxation. Dislocation accumulation is consistently observed along twin boundaries and near twin–grain-boundary and twin–twin junctions. These results provide 3D insight into coupled twin-boundary motion, strain redistribution, and interfacial defect activity in magnesium alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Characterization, |