| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Progress towards Understanding the Synthesis and Behavior of Metals Far from Equilibrium: A SMD Symposium Honoring Enrique Lavernia on the Occasion of His 60th Birthday
|
| Presentation Title |
Targeting Specific Nanotwin Configurations in Sputter Deposited Alloys to Enable Systematic Investigation of Dislocation-twin Interactions |
| Author(s) |
Francisco Andrade Chavez, Orcun Koray Celebi, Huseyin Sehitoglu, Jessica A. Krogstad |
| On-Site Speaker (Planned) |
Jessica A. Krogstad |
| Abstract Scope |
The remarkable strength of nanotwinned metals and metallic alloys has been attributed to a number of mechanisms, all involving frequent dislocation-twin interactions. Despite the high density of nanotwins that have been achieved through a variety of processing routes, the relative distribution of twins remain stochastic. For simple deformation modes, such a distribution of dislocation barriers can be accommodated by adapting traditional strengthening models. However, under cyclic loading conditions, the spacing between obstacles play a much more nuanced role. Modeling approaches have begun to tackle this problem, but without experimental validation in a controlled microstructure, the impact remains limited. Here we present preliminary efforts to understand the relationship between magnetron sputtering parameters, substrate constraint and the intrinsic properties of the alloy, including chemistry, stacking fault energy and the propensity for local ordering. This insight can be leveraged to tune the microstructure of nanotwinned thin films and systematically investigate fundamental dislocation-twin interactions. |
| Proceedings Inclusion? |
Undecided |