About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Evolution of Stresses during Twinning and Detwinning in Magnesium |
Author(s) |
Karim Louca, Jonathan Wright, Marta Majkut, Hamidreza Abdolvand |
On-Site Speaker (Planned) |
Karim Louca |
Abstract Scope |
Understanding deformation mechanisms of hexagonal close packed (HCP) metals at multiple length scales is essential for developing predictive materials models. Due to its high strength to weight ratio and its importance in several industrial sectors including the transportation industry, magnesium is used in this study. Three-dimensional synchrotron X-ray diffraction (3D-XRD) experiment is performed on magnesium specimens to investigate the development of grain resolved tensorial stresses during twinning and detwinning. More than 13,000 grains and 1,300 twin-parent pairs were captured during in-situ compression-tension tests. Here we show that at the early stages of plasticity, the axial stresses in the twins are higher than the parent grains but relax with further loading. During detwinning, a sign reversal is observed for the resolved shear stress (RSS) acting on the twin habit plane in the parent grain, while the sign of RSS in twins remains the same until total twin annihilation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Magnesium, |