About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Slip System Activities in BCC Ta Revealed Via Nanoindentation and Micropillar Compression: Experiments and Crystal Plasticity Simulations |
Author(s) |
Sajjad Izadpanah, Muthanna Kareem, Olajesu Olanrewaju, Kevin Jacob, Siddhartha Pathak, Curt Bronkhorst, Marko Knezevic |
On-Site Speaker (Planned) |
Sajjad Izadpanah |
Abstract Scope |
Experiments and corresponding crystal plasticity finite element (CPFE) simulations for 15 nanoindentation and 4 micropillar compression tests were conducted to determine active slip systems in Ta single crystals randomly distributed in the orientation space. Micropillar compression activated single, and poly slip systems depending on the crystal orientation, while nanoindentation induced a complex field under the indenter tip, triggering multiple slip systems at the onset of yielding. Slip trace analyses were employed to measure activated slip systems accommodating the yielding and initial hardening. Several approaches were taken to reveal underlying deformation mechanisms via CPFE. First, pairs of fixed slip directions and slip planes for the body-centered cubic Ta were explored. Next, maximum resolved shear stress plane (MRSSP) approach was taken. Finally, strain gradient (SG)-CPFE was employed. The simulation results of the three approaches are compared with the experimental data. Results and findings are presented and discussed in this paper. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Shaping and Forming |