| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure-Property Relationships of Bulk Metallic Glasses
|
| Presentation Title |
Influence of Strain Rate on Compressive Deformation Behavior of Pt-Cu-Ni-P Bulk Metallic Glass |
| Author(s) |
Shuhan Zhang, Jennifer Hay, Kurt Johanns, Aaron Stein, Udo Schwarz, Amit Datye |
| On-Site Speaker (Planned) |
Shuhan Zhang |
| Abstract Scope |
The deformation behavior of Pt57.5Cu14.7Ni5.3P22.5 metallic glass was systematically investigated under micro-/nanopillar compression, where pillars were prepared using a novel method based on thermoplastic forming. This manufacturing method not only produces better-defined pillar geometries with lesser structural flaws, but it also enables the fabrication of a large number of identical pillars in a short time. Here, the critical load for the formation of shear transformation zones and pillar yielding behavior was analyzed when applying well-controlled strain rates, showing that more pop-ins occur with decreasing strain rates. In contrast, yielding happens at higher strain rates in the areas with biggest flaws without time to accommodate the external pressure, which leads to the distribution of yield points becoming more scattered. Finally, we could not observe a clear strain rate effect from the stress at fracture point, in contrast to previous studies that reported a negative strain rate sensitivity during pillar compression tests. |
| Proceedings Inclusion? |
Planned: |