Comptes Rendus
Initiation of geometric roughening in polycrystalline metal films
Comptes Rendus. Mécanique, Volume 336 (2008) no. 1-2, pp. 224-231.

The mechanics of plasticity-induced roughening of initially planar polycrystalline metal films upon thermal cycling is presented. The emphasis is on films of FCC metals having grain size comparable to their thickness. In the model, the elastic substrate imposes a biaxial in-plane mismatch strain on the film. Calculations demonstrate how surface undulations develop with a length scale governed by the grain size, when plastic slip initiates above a critical strain. Under monotonic straining, the undulation amplitude grows in proportion to the imposed strain with extent dependent on the slip anisotropy. Upon cyclic plastic straining, three growth stages have been identified with the possibility of substantial roughness development.

Un modèle décrivant l'apparition de rugosités de surface induites par mécanisme plastique pour des films métalliques polycristallins soumis à des cycles thermiques est présenté. Le modèle porte sur des metaux à structure CFC, avec une taille de grain de l'ordre de l'épaisseur du film. Le substrat impose une déformation biaxiale au film. Les calculs montrent que des ondulations se développent en surface lorsque le glissement plastique s'initie, au delà d'une déformation critique. Sous chargement monotone, l'amplitude des ondulations, dépendante de l'anisotropie plastique, augmente proportionellement à la valeur de la déformation imposée. Sous chargement cyclique, trois stades de croissance de l'amplitude provoquant une rugosité marquée sont identifiés.

Published online:
DOI: 10.1016/j.crme.2007.11.013
Keywords: Solids, Thin films, Polycrystals, Plasticity, Surface roughness
Mot clés : Solides, Films minces, Polycristaux, Plasticité, Rugosité de surface

Guillaume Parry 1; Anthony G. Evans 2; John W. Hutchinson 3

1 SIMAP/LTPCM, CNRS UMR 5266-INPG-UJF, 1130, rue de la Piscine, 38402 St Martin d'Hères, France
2 Department of Materials, University of California, Santa Barbara, CA 93106, USA
3 School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
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Guillaume Parry; Anthony G. Evans; John W. Hutchinson. Initiation of geometric roughening in polycrystalline metal films. Comptes Rendus. Mécanique, Volume 336 (2008) no. 1-2, pp. 224-231. doi : 10.1016/j.crme.2007.11.013. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.11.013/

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