About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
Constrained Four-point Bending of Single Crystal Microbeams |
| Author(s) |
Novin Rasouli, Jungsub Lee, Matthew Daly |
| On-Site Speaker (Planned) |
Novin Rasouli |
| Abstract Scope |
Microscale mechanical testing of FCC solid solutions is a powerful tool to investigate size effects and deformation mechanisms. However, conventional methods often confound interpretation of deformation mechanism competition due to biased activation of plasticity processes at microstructural heterogeneities and asymmetry of resolved loadings along slip directions. We introduce a constrained four-point bending approach on single crystal microbeams that is performed in situ inside a scanning electron microscope. The geometry and orientation of microbeams are selected to ensure uniform surface stress distribution and equivalent Schmid factors for deformation processes, suppressing bias in mechanism activation. We apply this technique to isolate slip and twinning mechanisms in the CrCoNi medium entropy alloy as a benchmark material for small-scale mechanics studies. Furthermore, experimental load deflection curves are quantitatively compared to analytic beam theory and finite element analysis results to identify the onset of nonlinearity and validate the limits of continuum theory at this scale. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, High-Entropy Alloys |