About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
Second Phase Strengthening in Nanofoams and Nanolayers |
Author(s) |
David F. Bahr, Alexandra Loaiza |
On-Site Speaker (Planned) |
David F. Bahr |
Abstract Scope |
Materials with nm scale dimensions in planar (layers) and linear (ligaments in foams) form can exhibit high yield strength. We examined the solid solution and second phase particle strengthening to determine if a bulk strengthening mechanism would further increase the strength beyond size-induced strengthening using Zn and ZnO in Cu based nanofoams and Cu deposited in a non-equilibrium solution in a Nb/Cr multilayer thin film. In both cases the second phase (either through internal oxidation or precipitation) showed an order of magnitude increase in strengthening effect over the solid solution form. The precipitation hardened multilayer hardness increased from 6 to 10 GPa, while solid solution only showed a ≈500 MPa increase in strength. Similarly, the hardness of the foam increased by about a factor of two with the oxide particles, but showed no measurable increase in hardness between a Cu and Cu-10%Zn foam. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, |