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Flow stress improvement of a nickel multicrystal by physical vapor thin film deposition to reduce surface effects

Abstract : 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.
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https://hal-nantes-universite.archives-ouvertes.fr/hal-03671734
Contributor : pierre-antoine dubos Connect in order to contact the contributor
Submitted on : Wednesday, May 18, 2022 - 4:49:08 PM
Last modification on : Monday, July 18, 2022 - 8:24:05 AM
Long-term archiving on: : Monday, October 3, 2022 - 2:30:18 PM

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2022_Materials Letters X.pdf
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Pierre-Antoine Dubos, Ameni Zaouali, Pierre-Yves Jouan, Mireille Richard-Plouet, Valerie Brien, et al.. Flow stress improvement of a nickel multicrystal by physical vapor thin film deposition to reduce surface effects. Materials Letters: X, 2022, 14, pp.100145. ⟨10.1016/j.mlblux.2022.100145⟩. ⟨hal-03671734⟩

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