About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VI
|
Presentation Title |
H-12: Atomistic Modeling of the Mechanical Behavior of Gradient Nanoglasses |
Author(s) |
Suyue Yuan, Paulo Branicio |
On-Site Speaker (Planned) |
Suyue Yuan |
Abstract Scope |
A severe weakness of Metallic glasses (MGs) is their lack of ductility and tendency of catastrophic failure by shear banding. With the introduction of a nanoscale grain structure, named nanoglasses (NGs), the ductility of MGs can be significantly increased. A promising new design to compromise strength and ductility in NGs is based on the generation of a gradient distribution of grain sizes creating a so-called gradient nanoglass (GNG). Here, we use large-scale molecular dynamics simulations to investigate the deformation and failure mechanisms of GNGs. Simulations of tensile and compressive loading and nanoindentation of GNGs with grain sizes from 3 to 15 nm reveal a contrasting and unexpected behavior for loading perpendicular and parallel to the gradient direction. Overall, the gradient distribution of grain sizes promotes delocalization of the plastic deformation and delays failure by arresting the propagation of critical shear bands enhancing the observed overall ductility. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nanotechnology, Mechanical Properties, Mechanical Properties |