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The MEGALIT project has the objective to explore the potential to enhance functionalities of near-surface Metal Glasses (MG) recognized for their outstanding mechanical properties (Metal-like) and surface state (Glass-like), in order to substitute complex existing solutions by a single-multifunctional material coating approach. Our strategy relies on the advantages that can provide the combination of Physical Vapor Deposition coating technology suitable for the deposition of thin films of MG which show better ductility than bulk material and ultra-short pulsed laser irradiation treatment enabling an improvement of some of the required properties at the near-surface of the materials. The industrial relevance of bulk metallic glasses still suffers from detrimental weaknesses (such as insufficient toughness, limited industrial scale-up of the processing technologies and prohibitive cost) for large scale applications. However, these drawbacks can be reduced by decreasing their dimensionality, as in thin films elaboration. Within the MEGALIT project, the detailed strategy to address this challenge is to (i) carefully design the chemical composition of the amorphous alloys with regard to the targeted application ; (ii) exploit thin films PVD coatings technologies which are particularly adapted to generate amorphous metastable phase ; and (iii) tailor the functionalization of the coating surface with adequate ultrafast laser irradiation treatment. Such an advanced process could provide two distinct modifications of the surface and near-surface characteristics of the coating (depending on the irradiation conditions): a modification of the surface state (topography and roughness), to adapt the wetting properties (while maintaining the coating amorphous structure), or a controlled phase transition of the film to form a kind of composite-like nanostructure. Such design of metallic glass composites is a recent trend in the field of metallic glasses where breakthrough performances in terms of mechanical properties (toughness beyond that of the best existing alloys) have been demonstrated. This project is based on the knowledge of the IJL and MATEIS laboratories and IREIS, specialists of amorphous metallic alloys in thin film, of the Hubert Curien laboratory, specialist of the surface functionalization using laser and of the industrial partner (IREIS - HEF group), specialist of the industrial coatings and laser surface texturation at industrial scale. The outcome of this project will deliver technological solutions in three application fields: - Bio-medical applications in order to design a competitive antibacterial and hydrophobic surface treatment ensuring complementary corrosion and abrasion-resistant functions. - Aeronautics, energy and chemical industries to increase the erosion resistance of substrates (to sand, water, dust and potentially reactive particles) in severe operating conditions by combining enhanced mechanical properties (toughness, rigidity, hardness, fatigue resistance) and chemical stability. - Energy storage technologies and process industries, addressing the technical issue of the protection of components operating in corrosive conditions and requiring also electrical conductivity as well as mechanical strength. Consequently, the aim of the project relies on the demonstration of the potential of key enabling technologies (photonics and advanced materials) to address multifunctional-by-design issue, rather than a single property, which will make thin films metallic glasses distinctively attractive. While strong scientific and technical impacts are expected from this multidisciplinary approach, the partners are in position to further exploit positively the MEGALIT project results toward the socio-economical world.
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