About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
|
Symposium
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6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
In Situ High Energy X-ray Diffraction Study of the Elastoplastic Transition in a Polycrystalline Metastable β Ti Alloy |
Author(s) |
Jishnu Bhattacharyya, Darren C. Pagan, Gergely Farkas, Kristián Máthis, Vahid Tari, S. Nair , Ricardo A. Lebensohn, Anthony D. Rollett, Sean R. Agnew |
On-Site Speaker (Planned) |
Sean R. Agnew |
Abstract Scope |
The elastic strain tensor and orientation of individual grains within a metastable β-Ti alloy were tracked throughout the elastoplastic transition, using in-situ HEXD. A simple strategy to obtain the single-crystal elastic constants is demonstrated. The elastic anisotropy and intergranular interactions have a strong impact on the constitutive response of the aggregate. Full-field crystal plasticity simulations and single-crystal line profile analysis reveal that pencil glide is operative, and there is no preference for dislocations to reside on a particular glide plane. A new method to estimate the geometrically necessary dislocation (GND) density from rocking curves is introduced revealing a lack of correlation between the GND density and grain-level stress or higher hardening response. Finally, rotations of the grain-level stress tensor are revealed to be an order of magnitude larger than the lattice reorientation. These results provide new perspectives through which to contemplate the question of “hot-spots” responsible for failure. |
Proceedings Inclusion? |
Definite: Other |