About this Abstract |
Meeting |
TMS Specialty Congress 2025
|
Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
Presentation Title |
3D In-Situ Characterization of Twinning Inside Individual Mg4Al Grains Using DarkField X-Ray Microscopy |
Author(s) |
Sangwon Lee, Michael Pilipchuk, Can Yildirim, Duncan Greeley, Qianying Shi, Tracy Berman, Adam Creuziger, Evan Rust, Carsten Detlefs, Veera Sundararaghavan, John Allison, Ashley Bucsek |
On-Site Speaker (Planned) |
Sangwon Lee |
Abstract Scope |
Magnesium (Mg) alloys, being lighter than aluminum, offer potential for reducing fuel consumption in vehicles. Enhancing their mechanical properties depends on understanding deformation twinning mechanisms influenced by local stress fields. However, characterizing these local stresses before, during, and after twinning remains challenging. We present the first three-dimensional (3D) in-situ characterization of deformation twinning inside individual Mg-4wt.%Al grains under mechanical loading, using dark-field X-ray microscopy (DFXM) coupled with crystal plasticity finite element analysis. This method provides 3D spatially resolved maps of misorientation, dislocation density, and twin morphology with 100 nm resolution. Our results reveal that triple junction geometry may influence twin variant selection, twin growth is irregular and multidirectional, and twin-related junctions are sites of localized dislocation accumulation—a precursor to crack initiation. These insights into the micro-mechanisms of plastic deformation in Mg alloys can inform strategies to enhance their mechanical performance. |
Proceedings Inclusion? |
Undecided |