| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
O-43: High-pressure Synthesis of HCP Nickel from a Metallic Glass |
| Author(s) |
Abhinav Parakh, Mehrdad T. Kiani, David Doan, X. Wendy Gu |
| On-Site Speaker (Planned) |
Abhinav Parakh |
| Abstract Scope |
Nickel is a FCC metal at ambient conditions, as well as at elevated temperature and pressure. Here, we report the formation of HCP nickel from a nearly monoatomic metallic glass. Ni metallic glass nanoparticles that contain <5% boron are synthesized using colloidal methods. The thermodynamic stability of this material was tested by compressing the nanoparticles under hydrostatic pressure in a diamond anvil cell, and observing structural changes using x-ray diffraction. We found that the nanoparticles crystallized into an HCP lattice at ~10 GPa, which is lower than crystallization pressure of bulk metallic glasses. The nanoparticles remained HCP in structure after unloading. The post-compression transmission electron microscope imaging confirmed their HCP crystal structure, and the formation of nanocrystalline grains. We hypothesize the unique atomic structure of the nearly monoatomic Ni metallic glass and the differences in HCP and FCC elastic constants under pressure leads to the formation of this unusual material. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |