title: Micromechanics of Amorphous Metal/Polymer Hybrid Structures with 3D Cellular Architectures: Size Effects, Buckling Behavior, and Energy Absorption Capability.
abstract: By designing advantageous cellular geometries and combining the material size effects at the nanometer scale, lightweight hybrid microarchitectured materials with tailored structural properties are achieved. Prior studies reported the mechanical properties of high strength cellular ceramic composites, obtained by atomic layer deposition. However, few studies have examined the properties of similar structures with metal coatings. To determine the mechanical performance of polymer cellular structures reinforced with a metal coating, 3D laser lithography and electroless deposition of an amorphous layer of nickel-boron (NiB) is used for the first time to produce metal/polymer hybrid structures. In this work, the mechanical response of microarchitectured structures is investigated with an emphasis on the effects of the architecture and the amorphous NiB thickness on their deformation mechanisms and energy absorption capability. Microcompression experiments show an enhancement of the mechanical properties with the NiB thickness, suggesting that the deformation mechanism and the buckling behavior are controlled by the brittle-to-ductile transition in the NiB layer. In addition, the energy absorption properties demonstrate the possibility of tuning the energy absorption efficiency with adequate designs. These findings suggest that microarchitectured metal/polymer hybrid structures are effective in producing materials with unique property combinations.
authors.affiliation: Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, CH-3602, Thun, Switzerland.
authors.forename: Maxime
authors.initials: M
authors.lastname: Mieszala
authors.affiliation: Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, CH-3602, Thun, Switzerland.
authors.forename: Madoka
authors.initials: M
authors.lastname: Hasegawa
authors.affiliation: Université de Lyon, Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513 ECL-ENISE-ENTPE, 69134, Ecully, France.
authors.forename: Gaylord
authors.initials: G
authors.lastname: Guillonneau
authors.affiliation: Karlsruhe Institute of Technology, Institute for Applied Materials, 76131, Karlsruhe, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Bauer
authors.affiliation: Max-Planck-Institut für Eisenforschung GmbH, Structure and Nano-/Micromechanics of Materials, 40237, Düsseldorf, Germany.
authors.forename: Rejin
authors.initials: R
authors.lastname: Raghavan
authors.affiliation: Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, CH-3602, Thun, Switzerland.
authors.forename: Cédric
authors.initials: C
authors.lastname: Frantz
authors.affiliation: Karlsruhe Institute of Technology, Institute for Applied Materials, 76131, Karlsruhe, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Kraft
authors.affiliation: Ecole Polytechnique Fédérale de Lausanne, Tribology and Interface Chemistry Group, CH-1015, Lausanne, Switzerland.
authors.forename: Stefano
authors.initials: S
authors.lastname: Mischler
authors.affiliation: Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, CH-3602, Thun, Switzerland.
authors.forename: Johann
authors.initials: J
authors.lastname: Michler
authors.affiliation: Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, CH-3602, Thun, Switzerland.
authors.forename: Laetitia
authors.initials: L
authors.lastname: Philippe
keywords: amorphous metals; cellular materials; electroless deposition; microcompression; microlattice