| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVIII
|
| Presentation Title |
Effect of Porosity Level on the Mechanical Properties of Bicontinuous Nanoporous Metallic Glasses |
| Author(s) |
Chang Liu, Paulo Branicio |
| On-Site Speaker (Planned) |
Chang Liu |
| Abstract Scope |
Bicontinuous nanoporous metallic glasses, as newly developed materials, take advantage of the unique characteristics of metallic glasses (MGs) and open-cell nanoporous structures. We investigate the mechanical properties of bicontinuous nanoporous Cu64Zr36 MG using tensile loading molecular dynamics simulations. By varying the porosity of the material in the range 0.2 < φ < 0.7, we find that for low porosity level, φ < 0.2, closed-cell pores enhance the MG ductility. An increase in the porosity level (φ > 0.2) to generate an open-cell bicontinuous topology induces a brittle-to-ductile transition, shifting the deformation and failure mechanism from a single critical shear-band to necking and rupture of ligaments. A scaling law based on the tensile deformation of the ligaments and the Gibson-Ashby theory can account for the dependence of Young’s modulus with porosity. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Mechanical Properties |