About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
On the Role of Geometrically Necessary Dislocations in Void Formation and Growth in Response to Shock Loading Conditions in Wrought and Additively Manufactured Ta |
Author(s) |
James Lamb, Kaitlyn Mullin, Paul Christodoulou, Wyatt Witzen, McLean Echlin, Irene Beyerlein, Tresa Pollock |
On-Site Speaker (Planned) |
James Lamb |
Abstract Scope |
The role of 3D microstructure and distribution of geometrically necessary dislocations (GNDs) on void nucleation and growth processes has been investigated in both wrought and additively manufactured (AM) tantalum subjected to high-strain rate loading. Multi-modal 3D data was collected using TriBeam tomography to measure GND densities and their spatial relationship to voids generated during spallation. A microstructural comparison between the wrought and AM samples identified distinct void shapes and locations, with intragranular voids and more spherical voids frequently observed in the AM dataset. Voids preferentially form at both high-angle grain boundaries and low-angle subgrain boundaries, the latter of which are frequently observed in the AM material. Through a radial distribution analysis of all voids in the datasets, significant GND localization to near-void-surface regions was observed in both materials. These findings provide valuable insights into the links between nanoscale void nucleation, mesoscale void growth, and microstructural effects in dynamically loaded tantalum. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Modeling and Simulation, Other |