About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Twin Network Formation During Rapid Twinning of Mg Alloy Utilizing a Micromechanics-Based Explicit Twin Nucleation Model |
| Author(s) |
Yubraj Paudel, Haitham ElKadiri, Hongjoo Rhee |
| On-Site Speaker (Planned) |
Yubraj Paudel |
| Abstract Scope |
Current crystal plasticity models that capture deformation twinning still rely on a phenomenological approach that assigns twin domains from the crystallographic relationship between the local shear strain and twin volume fraction. However, twinning is driven by atomic-scale mechanisms that govern concomitant atomic shear and shuffles, which have proven difficult to represent through continuum-based formulations. Added complications arise from the competing nature of twin nucleation and propagation of existing twins, which complicate the stress state within the new polycrystal formed within the parent grain. In this work, we present a new twinning criterion that asserts an effect of the hydrostatic stress on twinning which needs atomic shuffles. An explicit twin inclusion formulation based on micromechanical calculations showed that the formation and propagation of new twins, relative distances between existing twins, and multiple variant selection are all cofactors that determine the twin network in magnesium polycrystals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Magnesium, Other |