| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVIII
|
| Presentation Title |
Mechanical Behavior and Phase Stability of Ductile Metallic Glass Nanoparticles |
| Author(s) |
Wendy Gu, Mehrdad Kiani, Abhinav Parakh |
| On-Site Speaker (Planned) |
Wendy Gu |
| Abstract Scope |
The properties of metallic glasses are highly dependent on fabrication and processing methods. Here, we use colloidal synthesis to make nickel-boron metallic glass nanoparticles with tunable size, composition and mechanical behavior. These nanoparticles are found to have high ductility and homogeneous deformation at room temperature. In situ transmission electron microscopy compression testing reveals that nanoparticles either deform homogeneously, or through a slowly propagating slip event reminiscent of shear banding. Scanning electron microscope compression testing shows that nanoparticles of 89 to 263 nm in size show an inverse size effect, in which larger nanoparticles are more likely to exhibit homogeneous deformation, while smaller nanoparticles are more likely to exhibit shear banding. Phase stability at high pressure are investigated by placing nanoparticles inside of a diamond anvil cell, compressing the particles to ~10 GPa pressure and performing in-situ X-ray diffraction. At elevated pressures, the nanoparticles form a hexagonal close-packed crystalline phase. |
| Proceedings Inclusion? |
Planned: |