About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Defects and Interfaces: Modeling and Experiments
|
Presentation Title |
Mechanical Properties of Cu-Al – Al2O3 Nanolaminates |
Author(s) |
Amit Sharma, Skye Supakul, Chunhua Tian, Daniele Casari, Carlos Guerra-Nunez, Johann Michler, Xavier Maeder |
On-Site Speaker (Planned) |
Xavier Maeder |
Abstract Scope |
Metal multilayer composites can show an enhancement of both strength and ductility related to the structure and properties of the interfaces between the layers. However, nanolaminate structures often suffer microstructural instability during annealing. In this context, we present experimental data on the mechanical behavior of Cu1-x – Alx (X: 0, 5 and 10 at.%, variation in stacking fault energy) nanolaminates with different thicknesses (40 to 120nm), separated by atomic layer deposition of 2 nm amorphous Al2O3 layers, deposited in one single process. The mechanical response of the multi-layered structures is investigated by nanoindentation and micropillars compression. This material system maintain exceptional stability even at elevated temperature. Moreover, the multilayered microstructure takes advantage of multiple small-scale mechanisms such as Hall-Petch, solid solution, and interface strengthening for enhanced mechanical properties compared to bulk. The post-mortem electron microscopy investigation provides insights in the role of the thin amorphous interface in the deformation mechanisms. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Thin Films and Interfaces, Other |