| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Yang, L. W.
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Topics
Publications (9/9 displayed)
- 2020Nanomechanical characterization of the fracture toughness of Al/SiC nanolaminatescitations
- 2018Mechanical properties of metal-ceramic nanolaminates: Effect of constraint and temperaturecitations
- 2018Effect of layer thickness on the mechanical behaviour of oxidation-strengthened Zr/Nb nanoscale multilayerscitations
- 2018Tensile deformation and fracture mechanisms of Cu/Nb nanolaminates studied by in situ TEM mechanical testscitations
- 2018Effect of layer thickness on the mechanical behavior of oxidation-strengthened Zr/Nb nanoscale multilayerscitations
- 2017Selective oxidation-induced strengthening of Zr/Nb nanoscale multilayerscitations
- 2016Orientation dependence of indentation behavior in Al-SiC nanolaminate compositescitations
- 2016Deformation mechanisms of ultra-thin Al layers in Al/SiC nanolaminates as a function of thickness and temperaturecitations
- 2016Anisotropy, size, and aspect ratio effects on micropillar compression of Al-SiC nanolaminate compositescitations
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article
Selective oxidation-induced strengthening of Zr/Nb nanoscale multilayers
Abstract
The paper presents a new approach, based on controlled oxidation of nanoscale metallic multilayers, to produce strong and hard oxide/metal nanocomposite coatings with high strength and good thermal stability. The approach is demonstrated by performing long term annealing on sputtered Zr/Nb nanoscale metallic multilayers and investigating the evolution of their microstructure and mechanical properties by combining analytical transmission electron microscopy, nano-mechanical tests and finite element models. As-deposited multilayers were annealed at 350 °C in air for times ranging between 1 and 336 h. The elastic modulus increased by ?20% and the hardness by ?42% after 15 h of annealing. Longer annealing times did not lead to changes in hardness, although the elastic modulus increased up to 35% after 336 h. The hcp Zr layers were rapidly transformed into monoclinic ZrO2 (in the first 15 h), while the Nb layers were progressively oxidized, from top surface down towards the substrate, to form an amorphous oxide phase at a much lower rate. The sequential oxidation of Zr and Nb layers was key for the oxidation to take place without rupture of the multi-layered structure and without coating spallation, as the plastic deformation of the metallic Nb layers allowed for the partial relieve of the residual stresses developed as a result of the volumetric expansion of the Zr layers upon oxidation. Moreover, the development of residual stresses induced further changes in mechanical properties in relation to the annealing time, as revealed by finite element simulations.