About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Material Responses Investigated Through Novel In-Situ Experiments and Modeling
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| Presentation Title |
Orientation and Temperature Dependence of Deformation Mechanisms in Tantalum: Insights From Micropillar Compression Tests |
| Author(s) |
Kevin Jacob, Olajesu Olanrewaju, Sajjad Izadpanah, Marko Knezevic, Sid Pathak |
| On-Site Speaker (Planned) |
Kevin Jacob |
| Abstract Scope |
Micropillar compression tests were performed on Tantalum (Ta) single crystals with four orientations [100], [111], [114], and [113] at temperatures ranging from room temperature to -140 °C to study the effects of temperature and orientation on slip mechanisms and strength. In-situ deformation imaging identified the exact slip planes of deformation for each orientation. Yield strength data at varying temperatures allowed for the calculation of activation volumes and energies, showing a transition in the [111] orientation from a slip-dominated to a twinning-dominated mechanism at low temperatures. At room temperature, yield strength was highest in the [111] orientation, followed by [113], [100], and [114]. However, at -140 °C, the [100] orientation exhibited the highest strength, indicating an increase in Peierls stress. In the [111] orientation, twinning caused a significant strength drop from -90 °C to -140 °C and enhanced strain hardening. These results highlight the strong temperature and orientation dependence of Ta’s deformation behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nanotechnology, Mechanical Properties, Other |