%0 Journal Article %T Flow stress improvement of a nickel multicrystal by physical vapor thin film deposition to reduce surface effects %+ Institut de Recherche en Génie Civil et Mécanique (GeM) %+ Institut des Matériaux Jean Rouxel (IMN) %A Dubos, Pierre-Antoine %A Zaouali, Ameni %A Jouan, Pierre-Yves %A Richard-Plouet, Mireille %A Brien, Valerie %A Gloaguen, David %A Girault, Baptiste %< avec comité de lecture %@ 2590-1508 %J Materials Letters: X %I Elsevier %V 14 %P 100145 %8 2022 %D 2022 %R 10.1016/j.mlblux.2022.100145 %Z Engineering Sciences [physics]/Materials %Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]Journal articles %X Uniaxial tensile tests were carried out on nickel sheets containing only few grains across the thickness thus presenting a so-called multicrystalline state. Pristine sheets used as reference and substrates covered by a nickel layer deposited by physical vapor deposition (magnetron sputtering) were studied. Results attest that the surface treatment affects the plastic deformation mechanisms by playing the role of a blocking barrier to dislocation movement which leads to a significant improvement of mechanical performances. The surface restructuring of the nickel sheets is efficient to stop dislocation escape through free surfaces and allows a mechanical improvement of the well-known strong mechanical softening of the multicrystals. %G English %2 https://nantes-universite.hal.science/hal-03671734/document %2 https://nantes-universite.hal.science/hal-03671734/file/2022_Materials%20Letters%20X.pdf %L hal-03671734 %U https://nantes-universite.hal.science/hal-03671734 %~ CNRS %~ EC-NANTES %~ IMN %~ UNAM %~ GEM %~ PCM %~ INC-CNRS %~ NANTES-UNIVERSITE %~ NANTES-UNIV %~ TEST2-HALCNRS