About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Elastoplastic Transition in a Metastable β-titanium Alloy, Timetal 18 by In-situ High Energy X-ray Diffraction |
Author(s) |
Jishnu Bhattacharyya, Sriramya Nair, Darren Pagan, Vahid Tari, Ricardo Lebensohn, Anthony Rollett, Sean Agnew |
On-Site Speaker (Planned) |
Jishnu Bhattacharyya |
Abstract Scope |
High energy X-ray diffraction is used to measure evolutions of the complete elastic strain tensor and the crystallographic orientation of individual grains of a metastable β-Ti alloy, Timetal-18, in solutionized and quenched state. Using these data, a strategy to obtain the single crystal elastic constants (SEC) is demonstrated. The experimental data are compared with the predictions of the parallelized elasto-viscoplastic Micromechanical Analysis of Stress-Strain Inhomogeneities with fast Fourier transform (MASSIF) code instantiated with a measured 3D microstructure. Examination of the individual grain responses revealed “strain softening” in a subset of grains which we hypothesize is due to distinct initial intra-granular substructure. Finally, the rotation of the grain-level stress state (e.g. the rotations of the eigenvectors of the principal stresses), which has long been theorized to occur during the elastoplastic transition, is experimentally verified and shown to be much larger than the crystallographic reorientation of the lattice due to slip. |
Proceedings Inclusion? |
Planned: |