About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Atomistic Simulations Linked to Experiments to Understand Mechanical Behavior: A MPMD Symposium in Honor of Professor Diana Farkas
|
Presentation Title |
Short-range Order Hardening and Enhanced Tensile Ductility in Nanocrystalline Ag by Intercalation of Amorphous Ni-rich Nanolayers |
Author(s) |
Frederic Sansoz |
On-Site Speaker (Planned) |
Frederic Sansoz |
Abstract Scope |
This talk will focus on a novel nanoscale strengthening mechanism by intercalating ultrathin amorphous Ni-rich nanolayers between pure nanocrystalline Ag films, studied by integrated experiments and atomistic simulations. We will present a sputter-deposited multilayered nanocrystalline Ag and amorphous Ni-Ag alloy material with a stable grain size (22 nm) combining the highest hardness (2.6 GPa), tensile strength (677 MPa) and plastic elongation (6.6%) ever reported for nanostructured Ag metals. The integration of amorphous Ni-Ag alloy nanolayers substantially improves the strain hardening behavior and extends the tensile ductility compared to standard crystalline Ag/Ni nanolaminates. High-resolution STEM imaging and large-scale hybrid Monte-Carlo/MD simulations are deployed to show that this phenomenon results from strain-induced chemical short-range order within the amorphous Ni-Ag nanolayers during plastic deformation. This nanoscale strengthening mechanism can be easily leveraged to develop nanocrystalline films with exceptional mechanical and physical properties, notably, conductive Ag electrodes with ultrahigh tensile strength and electrical conductivity. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Thin Films and Interfaces |