| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior Related to Interface Physics IV
|
| Presentation Title |
Plasticity at the Crystalline Metal/Amorphous Oxide Interface in Al/Al2O3 Nanolaminates |
| Author(s) |
Thomas E. J. Edwards |
| On-Site Speaker (Planned) |
Thomas E. J. Edwards |
| Abstract Scope |
Nanoscale composites can display mechanical properties that far exceed the normally achieved strength, toughness or microstructural stability of the individual bulks. Here, thin-film multilayers of crystalline Al and amorphous Al2O3 were produced by atomic layer (Al2O3) and physical vapour deposition (Al) uniquely-combined within a single deposition system. Both the amorphous oxide layer thickness (0.1 nm – 10 nm) and the crystalline metal layer thickness (10 nm – 250 nm) were optimised for strength (over-1 GPa) and ductility by in-SEM microcompression and on-beam tensile testing. Such multilayer films are thermally stable up to 0.85 T/Tm. Whilst thermodynamic parameters, from microcompression at variable temperature and strain rate, have told us that the mechanics is boundary-controlled, TEM tensile loading and nanocompression is performed to characterise the exact role of the amorphous-crystalline interfaces on dislocation motion in metallic layers. A parallel molecular dynamics simulation study is underway to clarify the potential atomic-scale mechanisms involved. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Characterization, Composites |