| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
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| Presentation Title |
Plasticity of Fused Silica Studied by High-temperature Micropillar Compression and Ptychographic X-ray Computed Tomography |
| Author(s) |
Remo Nico Widmer, Alexander Groetsch, Guillaume Kermouche, Ana Diaz, Manish Jain, Rajaprakash Ramachandramoorthy, Laszlo Pethö, Jakob Schwiedrzik, Johann Michler, Nicholas X. Randall |
| On-Site Speaker (Planned) |
Nicholas X. Randall |
| Abstract Scope |
As the miniaturization of fused-silica micro-components progresses, we need to understand and predict this material’s micro-scale plasticity. Displacement-controlled micropillar compression test at high temperatures up to 600 °C and variable strain-rates up to 1 s-1 was followed by synchrotron-based ptychographic X-ray computed tomography (PXCT) with a spatial resolution of 23 nm3 and absolute density measurement with an accuracy of +/- 0.025 g/cm3. The deformation mechanisms appear to transition as follows: Shear-localization and shear-promoted densification at 25 °C; homogeneous shear-flow and densification limited by radial cracking at 300 °C; and unconstrained shear-flow and limited densification due to weak confinement strength at 600°C. These results provide a new perspective on the interplay of various deformation mechanisms that accommodate plasticity in fused silica, and their temperature-dependence. Meanwhile, PXCT is demonstrated to be a powerful tool that matches the requirements in spatial resolution and contrast for studying plasticity enabling mechanisms in amorphous materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Additive Manufacturing |