About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XX
|
Presentation Title |
Origin of Low Temperature Mechanical Loss in Metallic Glass |
Author(s) |
Leo Zella, Jaeyun Moon, Takeshi Egami |
On-Site Speaker (Planned) |
Takeshi Egami |
Abstract Scope |
Mechanical loss in metallic glass is important for the mechanical properties, ductility, internal friction, and brittleness of metallic glass. However, the microscopic mechanism of mechanical loss is not well understood. Using molecular dynamics (MD) simulations of sinusoidal mechanical perturbation, we have studied the low temperature mechanical loss in a prototypical Cu64.5 Zr35.5 metallic glass to identify the mechanism and nature of mechanical loss. Using dynamical mechanical spectroscopy (DMS) with atomic-level resolved stresses in MD, we have identified different groups of atoms involved in the mechanical loss based on their atomic-level viscoelastic response. We show the cooperative nature of the lossy atoms, which groups contribute the most to the mechanical loss, their spatial aggregations and the atomic shear stress build up that results in the mechanical loss. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Mechanical Properties, Other |