About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VI
|
Presentation Title |
Nanostructured Metallic Glasses from Colloidal Nanoparticles |
Author(s) |
Melody Wang, Wendy Gu, Mehrdad Kiani |
On-Site Speaker (Planned) |
Melody Wang |
Abstract Scope |
Metallic glasses possess superior mechanical properties, but often deform via shear bands leading to near-zero ductility. To overcome this issue, we use iron boride amorphous nanoparticles made via colloidal synthesis to form bulk nanoglasses, which are analogous to nanocrystalline materials except with amorphous grains and grain boundaries. The individual nanoparticles are compressed in an SEM, and stress-strain curves and videos show that ductile deformation occurs through the slow formation of multiple cracks. We compact nanoparticles into millimeter sized nanoglasses and measure elastic modulus and hardness values of up to 160 GPa and 8 GPa, respectively, via nanoindentation. TEM is used to characterize the amorphous grains and interfaces. Large (~12 um) nanoglass micropillars are compressed and found to have plastic strain of 3.5%, which is higher than most iron-based glasses that are brittle. We relate this plasticity to deformation at the amorphous interfaces. The effect of nanoparticle size is also explored. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Mechanical Properties, Other |