About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Theory and Design of Metallic Glasses
|
| Presentation Title |
Mechanisms of Nanoscale Deformation in Bulk Metallic Glasses Investigated Using Strain Rate Dependent Compression of Pt-Cu-Ni-P Pillars |
| Author(s) |
Shuhan Zhang, Aaron Stein, Amit Datye, Udo D. Schwarz |
| On-Site Speaker (Planned) |
Udo D. Schwarz |
| 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 many identical pillars in a short time. 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. Interestingly, fracture stress exhibited a different pattern, showing no significant strain rate sensitivity, which contrasts with previous studies that reported negative strain rate sensitivity. A novel scheme for nanoscale pillar deformation was proposed to delineate the structural evolution of a micropillar under compression into three phases. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, |