About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VII
|
Presentation Title |
The Effect of Composition and Long-range Order on the Strength of Defect-free Faceted Cu-Au Nanoparticles |
Author(s) |
Zhao Liang, Eugen Rabkin |
On-Site Speaker (Planned) |
Eugen Rabkin |
Abstract Scope |
We fabricated faceted single crystalline nanoparticles of Cu, Cu3Au and CuAu alloys employing the solid state dewetting of thin single- and bilayer films deposited on sapphire substrate. The mechanical behavior of the nanoparticles was determined employing in-situ microcompression tests in scanning electron microscope. We demonstrated that most nanoparticles exhibit all characteristic features of nucleation-controlled plasticity and high compressive strength in the GPa range. The particles of disordered Cu3Au solid solution were significantly stronger than the particles of pure Cu, demonstrating the nanoscale solid solution hardening effect. Partial ordering at a temperature of 350 °C reduced the strength of Cu3Au particles, yet the strength of these particles continuously increased with increasing volume fraction of the ordered phase, approaching the strength of disordered particles once full ordering was achieved. We discussed these findings in terms of the effect of local atomic environment on the energy barrier for dislocations nucleation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, |