About this Abstract |
Meeting |
TMS Specialty Congress 2024
|
Symposium
|
Accelerating Discovery for Mechanical Behavior of Materials 2024
|
Presentation Title |
Maximizing Tensile Properties Through Partially Active Grain Boundary Segregation in Nanocrystalline Sterling Silver Alloys |
Author(s) |
Pavel Nikitin, Frederic Sansoz |
On-Site Speaker (Planned) |
Pavel Nikitin |
Abstract Scope |
Enhancing thermal stability and tensile mechanical behavior in nanocrystalline alloys by grain-boundary (GB) solute segregation is a critical but challenging problem, due to the complexity of relationships between solute segregation and deformation mechanisms at GBs. Notably, understanding the nature of GB strengthening and softening mechanisms in nanocrystalline alloys requires the integration of multiscale experimental and theoretical studies. This talk presents an integrated experimental and atomistic simulation study focused on the effects of Cu solute concentration on the tensile behavior of nanocrystalline Ag alloys produced by DC magnetron sputtering technique. We support our experiments by large scale hybrid Monte-Carlo and Molecular-Dynamics simulations and present a systematic study where three concentration-dependent regimes of plasticity are investigated: (1) Classical segregation strengthening behavior at low solute contents, (2) shear band-induced softening at high contents, and (3) maximum strengthening in nanocrystalline Sterling silver (8 at.% Cu) governed by partially active segregation from GB solute clustering. |
Proceedings Inclusion? |
Definite: Other |