|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials 2021
||Nanotwinned Ni-Mo-W Alloys with Ultrahigh Strength and Localized Plasticity
||Gianna Valentino, Jessica Krogstad, Timothy Weihs, Kevin Hemker
|On-Site Speaker (Planned)
The engineering of mechanical properties and performance of materials has traditionally relied heavily 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 (MEMS), and many other engineering applications aiming 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 the finely spaced growth twins that form during the deposition process. 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 twin planes, which will be key to understanding and utilizing these materials.