| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
|
| Presentation Title |
Disordered Interfacial Features as Local Equilibrium States Capable of Modifying Nanocrystalline Metals |
| Author(s) |
Timothy J. Rupert |
| On-Site Speaker (Planned) |
Timothy J. Rupert |
| Abstract Scope |
To play devil’s advocate with title of this symposium, we show here that grain boundaries naturally prefer disordered states and that this behavior can be emphasized with proper alloy design. Nanocrystalline metals demonstrate this principle, as we explore the usage of structurally-disordered features to improve these materials. Cu-rich alloys with varying degrees of chemical complexity at the boundary are used to study the stabilization of amorphous complexions. We isolate both the local descriptors of these features, including short range order and chemical heterogeneities, as well as the kinetics associated with ordered-disordered complexion transitions. Al-rich alloys are then used to show how disordered features can be incorporated into a hierarchical nanostructure. Both amorphous grain boundary complexions and elongated nanoscale precipitates with disordered interiors are observed, with disorder again tied to improved mechanical properties. As a whole, this work shows that disorder can be an opportunity. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Phase Transformations, Mechanical Properties |