About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
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Presentation Title |
Ultrahigh Strength and Strain Localizations in Nanotwinned Ni-Mo-W Alloys |
Author(s) |
Gianna M. Valentino |
On-Site Speaker (Planned) |
Gianna M. Valentino |
Abstract Scope |
The engineering of mechanical properties and performance of materials has traditionally relied on the exploitation of the processing-structure-property relations as a design tool to synthesize new materials. Nanostructured materials are no exception and have received considerable attention in recent years for thin film protective coatings, microelectromechanical systems, and many other engineering applications aimed to achieve a balance of strength and ductility. Sputter-deposited Ni-Mo-W films have been shown to possess ultrahigh strength, highly anisotropic plasticity, low electrical resistivity, and low thermal expansion that stem from finely spaced growth twins (<5 nm). Here we report on in-situ SEM micropillar compression and post-mortem microstructural analysis to elucidate the fundamental deformation mechanisms that underpin the extreme strength and plasticity in nanotwinned Ni-Mo-W. Emphasis will be placed on the loading orientation with respect to the coherent twin boundaries and local strains, both of which are key to uncovering the mechanisms underpinning the unique deformation behavior. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Thin Films and Interfaces |