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.
Mots-clés : Solides, Films minces, Polycristaux, Plasticité, Rugosité de surface
Guillaume Parry 1; Anthony G. Evans 2; John W. Hutchinson 3
@article{CRMECA_2008__336_1-2_224_0, author = {Guillaume Parry and Anthony G. Evans and John W. Hutchinson}, title = {Initiation of geometric roughening in polycrystalline metal films}, journal = {Comptes Rendus. M\'ecanique}, pages = {224--231}, publisher = {Elsevier}, volume = {336}, number = {1-2}, year = {2008}, doi = {10.1016/j.crme.2007.11.013}, language = {en}, }
TY - JOUR AU - Guillaume Parry AU - Anthony G. Evans AU - John W. Hutchinson TI - Initiation of geometric roughening in polycrystalline metal films JO - Comptes Rendus. Mécanique PY - 2008 SP - 224 EP - 231 VL - 336 IS - 1-2 PB - Elsevier DO - 10.1016/j.crme.2007.11.013 LA - en ID - CRMECA_2008__336_1-2_224_0 ER -
Guillaume Parry; Anthony G. Evans; John W. Hutchinson. Initiation of geometric roughening in polycrystalline metal films. Comptes Rendus. Mécanique, Duality, inverse problems and nonlinear problems in solid mechanics, 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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