About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2026 - In-Situ Characterization Techniques
|
| Presentation Title |
Twin Nucleation at Grain Boundaries in Mg Analyzed Through In Situ Electron Backscatter Diffraction and High-Resolution Digital Image Correlation |
| Author(s) |
Maral Sarebanzadeh, Alberto Orozco-Caballero, Eugenia Nieto-Valeiras, Javier LLorca |
| On-Site Speaker (Planned) |
Maral Sarebanzadeh |
| Abstract Scope |
Extension-twin nucleation at grain boundaries in weakly textured pure Mg was studied by in situ tensile tests combining EBSD and high-resolution DIC. Despite a low or negative Schmid factor (SF) for twinning in most grains, over 150 boundary-associated twins were captured and grouped. Single nucleation and co-nucleation at boundaries and triple junctions dominated, whereas twin transfer was rare. Twinning initiated in large grains favourably oriented for basal slip, then progressed into smaller, less-oriented grains as strain increased, indicating that basal slip-induced local stresses—not twinning SF—govern nucleation. Microstructural analysis revealed that variant selection often followed the alignment of twin shear with the boundary plane rather than the classical SF criterion. These findings highlight the role of basal slip-generated stress concentrations and boundary geometry in activating and selecting extension twins in Mg, providing new insight for tailoring textures to control deformation mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Characterization, |