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Elastic anisotropy of polycrystalline Au films: Modeling and respective contributions of X-ray diffraction, nanoindentation and Brillouin light scattering

Article dans une revue avec comité de lecture
Author
FAURIE, Damien
239210 Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux [LPMTM]
DJÉMIA, Ph
LE BOURHIS, Éric
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
RENAULT, P.O.
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
ROUSSIGNÉ, Yves E
CHERIF, Salim Mourad
CASTELNAU, Olivier
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
PATRIARCHE, Gilles
411 Laboratoire de photonique et de nanostructures [LPN]
GOUDEAU, Philippe H.
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
BRENNER, Renald
233425 Laboratoire des Sciences des Procédés et des Matériaux [LSPM]

URI
http://hdl.handle.net/10985/15317
DOI
10.1016/j.actamat.2010.05.034
Date
2010
Journal
Acta Materialia

Abstract

Elastic properties of non-textured and {1 1 1}-fiber-textured gold thin films were investigated experimentally by several complementary techniques, namely in situ tensile testing under X-ray diffraction (XRD), nanoindentation and Brillouin light scattering (BLS). Specimens were probed along different directions to reveal the strong effects of elastic anisotropy at the (local) grain and (global) film scales. XRD allows the investigation of both local and global anisotropies, while BLS and nanoindentation are limited to global analyses. A micromechanical model, based on the self-consistent scheme, and accounting for the actual microstructure of the films, is applied to interpret experimental data. Although different types of elastic constants can be determined with the used experimental techniques (static/dynamic, local/global), a good agreement is obtained, showing that comparison of these techniques is feasible when carried out carefully. In particular, the use of a micromechanical model to estimate the effects of the local elastic anisotropy at the film scale is unavoidable. The presented results show that XRD, BLS and nanoindentation should capture anisotropic texture effects on elastic constants measurements for materials with a Zener anisotropy index larger than 2. Conversely, the actual texture of a given specimen should be taken into account for a proper analysis of elastic constants measurements using those three experimental techniques.

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