| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
|
| Presentation Title |
Defect-interface Interactions and Nanomechanical Behavior of 3D interfaces in Ti/Nb Nanolaminates |
| Author(s) |
Mauricio De Leo, Justin Cheng, Shuozhi Xu, Jon Kevin Baldwin, Irene J. Beyerlein, Nathan Mara |
| On-Site Speaker (Planned) |
Mauricio De Leo |
| Abstract Scope |
Chemically sharp interfaces in nanolayered composites or “2D interfaces”, enhance mechanical properties such as strength and hardness, yet their ductility and toughness limit applications. Widening these heterophase interfaces chemically and crystallographically provides a region of crystallographic transition, or “3D interfaces”, increasing the ductility and toughness of the material by attenuating the transmission of dislocation pileups. Here, we introduce 3D interfaces to DC magnetron sputtered hcp/bcc Ti/Nb nanolayered composites to enhance their mechanical behavior. 3D interface layer thicknesses (h’) introduced range from 5 to 40 nm on composites with pure layer sizes (h) from 5 to 40 nm respectively. Corresponding 2D interface composites were studied as well. We report Berkovich nanoindentation, micropillar compression, and transmission electron microscopy results to visualize the structure-property relationships leading to mechanical enhancement due to 3D interfaces, and discuss our findings in the context of atomic-level modeling of dislocation-interface interactions including dislocation transmission, blocking and storage. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Mechanical Properties, Titanium |