About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
Nanoscale Templating of Reinforcing Phases with Linear Complexions to Achieve Extreme Strength |
Author(s) |
Divya Singh, Edward Li, Hannah Howard, Daniel S. Gianola, Timothy J. Rupert |
On-Site Speaker (Planned) |
Timothy J. Rupert |
Abstract Scope |
The stress fields around dislocations can induce local phase transformations, coined linear complexions. In this talk, we explore how linear complexions can directly modify dislocation motion, with an eye toward enabling pronounced strengthening and strain hardening in face-centered cubic alloys. Atomistic simulations are first used to uncover unique behavior for different types of linear complexions, including dislocation breakaway, faceting, and nucleation from the complexion environment. The critical stress barriers are then identified for complexions with different sizes and spatial configurations, in order to build continuum descriptions of plasticity. Next, processing experiments are used to induce linear complexion formation and study their structure, demonstrating that a high density of strong obstacles can be achieved through this concept. Finally, mechanical deformation experiments in transmission imaging modes show that individual dislocation motion can be directly modified with linear complexions. As a whole, linear complexions provide a direct pathway for microstructure design of alloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Thin Films and Interfaces, Phase Transformations |