About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2026 - In-Situ Characterization Techniques
|
| Presentation Title |
Evaluating the composite model using Dark Field X-ray Microscopy |
| Author(s) |
Antonella Gayoso Padula, Adam André Cretton, Johann Haack, Grethe Winther, Henning Friis Poulsen |
| On-Site Speaker (Planned) |
Antonella Gayoso Padula |
| Abstract Scope |
Plastic deformation in aluminium leads to dislocation structures such as dislocation cells and geometrically necessary boundaries. The composite model of plasticity describes cell walls as hard regions with high dislocation density and cell interiors as soft regions with lower dislocation density. Under tensile strain, walls align with the applied load, while interiors deform compressively due to confinement. Previous studies of these microstructures have relied on surface-sensitive techniques like transmission electron microscopy (TEM), limiting insight into bulk behavior. In this study, we used Dark Field X-ray Microscopy (DFXM) to investigate the bulk plasticity of polycrystalline aluminium under tensile loads ranging from 0 to 7%. DFXM enables non-destructive, three-dimensional mapping of lattice strain and orientation with approximately 150 nm spatial resolution and angular sensitivity of about 10−4 radians. We tracked the evolution of strain and misorientation in individual grains to evaluate the applicability of the composite model in describing bulk plastic deformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Mechanical Properties, Characterization |