| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging
|
| Presentation Title |
Mapping Local Strains during In Situ SEM Deformation of Nanoporous Materials |
| Author(s) |
Kevin Schmalbach, Nathan A. Mara, Antonia Antoniou |
| On-Site Speaker (Planned) |
Nathan A. Mara |
| Abstract Scope |
Porous metallic materials represent a class of materials where the interplay of ligament length, width, node structure, and local geometry/curvature offer a rich parameter space for study of critical length scales on mechanical behavior. Colloidal templating of 3-dimensionally ordered macroporous (3DOM, i.e. inverse opal) materials provides a unique structure for investigation of mechanical behavior at small length scales across the tungsten brittle-ductile transition. Micropillar compression tests show failure at 50 MPa contact pressure at 30 °C, implying a ligament yield strength of approximately 6.1 GPa for a structure with 5% relative density. In situ SEM frustum indentation with in-plane strain maps perpendicular to the loading indicate local compressive strains of approximately 2% at failure at room temperature. Large (20%) nonlocal strains are evident at 125 °C, with a transition to enhanced strength and deformability at higher temperatures. |
| Proceedings Inclusion? |
Planned: |