About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Interstitial–Metal Interactions: The Outsized Role of Small Atoms
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| Presentation Title |
Effects of Interstitial Oxygen on the Grain-scale Deformation Behavior of Vanadium |
| Author(s) |
Rachel Lim, Harry Smith, Jennifer Glerum, Kaila Bertsch, Scott Donald |
| On-Site Speaker (Planned) |
Rachel Lim |
| Abstract Scope |
Refractory metals are of increasing interest for manufacturing due to their strength at high temperatures, impact toughness, and corrosion resistance. However, their mechanical properties are highly sensitive to the presence of interstitial atoms. In addition, these metals exhibit a non-Schmid effect wherein the movement of dislocations is controlled by more than just the resolved shear stress. In this study, we leverage advanced in situ synchrotron x-ray diffraction techniques—specifically, high-energy x-ray diffraction microscopy (HEDM)—to systematically probe the effects of oxygen interstitials on the deformation behavior of vanadium under uniaxial tension and compression. By combining far-field and near-field HEDM, we obtain three-dimensional measurements of grain morphology, orientation, and elastic strain tensor. This information is used to inform crystal plasticity modeling to study the effects of oxygen and grain orientation on the non-Schmid effects in vanadium. In turn, the non-Schmid effects account for the observed macroscopic tension-compression asymmetry. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Modeling and Simulation |