About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
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| Presentation Title |
Dynamic Nanoindentation for Real‑Time Materials Insights under Extreme Conditions |
| Author(s) |
Verena Maier-Kiener, Stefan Zeiler |
| On-Site Speaker (Planned) |
Verena Maier-Kiener |
| Abstract Scope |
We introduce a dynamic nanoindentation framework centered on a stiffness ratio, loading slope / unloading stiffness, to probe mechanical transitions and flow behavior under extreme conditions. Using continuous stiffness measurement (CSM) during a single indentation, this metric quantitatively tracks elastic‑to‑plastic deformation. In alloys from -150 °C to 25 °C, the stiffness ratio unambiguously identifies the brittle‑to‑ductile transition temperature (BDTT) using a Berkovich indenter while being resistant to thermal drift. The approach extends to operando environments, including in situ electrochemical charging via a side‑charging cell and high‑temperature testing, yielding real‑time deformation insights. Using spherical indenters, a geometric calibration which corrects for tip imperfections enables strain‑rate‑controlled indentations to extract localized flow curves. Under electrochemical charging, stiffness ratio shifts correlate with increased hardness and reduced constraint factors, revealing hydrogen-induced plasticity changes. These protocols harness the stiffness ratio to connect lab‑scale precision with application‑relevant extremes, providing a high‑throughput pathway for next‑generation materials design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Environmental Effects, Characterization |