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Communication Dans Un Congrès Année : 2023

Strong and ductile thin film metallic glasses through advanced nanoscale design strategies

James Best
Thomas Pardoen
  • Fonction : Auteur
  • PersonId : 877239
Andrea Li Bassi
Gerhard Dehm
  • Fonction : Auteur
  • PersonId : 1090441

Résumé

The synthesis of advanced thin film metallic glasses (TFMGs) with engineered microstructures capable to provide a large combination of mutually exclusive mechanical properties (i.e. high strength and ductility) is an open research topic. Here, I will present recent results involving two (2) strategies to finely tune the microstructure of TFMGs down to the atomic scale, resulting in outstanding and controlled mechanical behavior. Firstly, I will show the potential of Pulsed Laser Deposition (PLD) as a novel technique to synthetize nanostructured Zr50Cu50 (%at.) TFMGs. Specifically, a variety of TFMG microstructures – among which amorphous nanogranular films showing large free volume interfaces and a nanolaminated self-assembled atomic structures – have been deposited. This results in an unique mechanical behavior as shown by in situ TEM/SEM tensile/compression tests, reporting homogeneous deformation combined with a large yield strength (>3 GPa) and ductility (>9 %) product [1]. Then, I will focus on the fabrication of fully amorphous nanolaminates with nanoscale period. I will show how the control of the sublayer thickness (from 100 down to 5 nm) influences the deformation behavior, while tuning the mechanical properties. Specifically, fully amorphous (Zr24Cu76/Zr61Cu39 %at.) nanolaminates with bilayer period <50 nm limit shear band/crack propagation, while providing a good combination of large ductility (> 10%) and yield strength (>1.5 GPa). Overall, our results pave the way to the development of novel TFMGs with improved mechanical properties and wide application range. [1] M. Ghidelli et al., Acta Mater., 213, 116955, 2021.
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Dates et versions

hal-04309974 , version 1 (27-11-2023)

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  • HAL Id : hal-04309974 , version 1

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Andrea Brognara, James Best, Thomas Pardoen, Hosni Idrissi, Andrea Li Bassi, et al.. Strong and ductile thin film metallic glasses through advanced nanoscale design strategies. First MecaNano General meeting, Apr 2023, Madrid, Spain. ⟨hal-04309974⟩
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