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NanoMat 2018 Nano Research & Applications
ISSN: 2471-9838 Page 26
April 26-27, 2018
Rome, Italy
17th Edition of International Conference on
Emerging Trends in
Materials Science and
Nanotechnology
T he main topic of this presentation is concerned with the
study of the coupling between the mechanical properties
of thin films on substrates and their morphologies. In a
first part, the aging of the buckling patterns experimentally
observed at the mesoscopic scale onto the surface of metallic
thin films deposited on substrates is studied by means of
finite element simulations (FEM). The conditions for the
transition from straight-sided wrinkles to telephone-cords or
circular blisters are first discussed. The problem of the shape
instability of multilayered hyperelastic solids has been then
considered and the in-phase and out-of-phase configuration
for a thin layer embedded in a heterogeneous matrix has
been discussed versus the elastic coefficients of the different
neo-hookean materials. In a second part, the evolution of the
vicinal surface of gold single crystals deformed by external
uniaxial compression tests and in situ observed by UHV
scanning tunneling microscopy is investigated (see figure
2). It is demonstrated that the slip traces resulting from the
emergence of moving dislocations at the free surface highly
modify the organization of the vicinal steps. A model based on
energetic considerations is proposed and discussed to explain
the observed phenomenon.
Recent Publications
1. Coupeau C, Camara O, Drouet M, Durinck J, Bonneville
J, Colin J and Grilhé J (2016) Slip trace-induced vicinal
step destabilization. Physical Review B 93:041405.
2. Hamade S, Durinck J, Parry G, Coupeau C, Cimetière
A, Grilhé J and Colin J (2001) Effect of plasticity and
atmospheric pressure on the formation of donut and
croissant-like buckles. Physical Review E 91:012410.
3. Ruffini A, Finel A, Colin J and Durinck J (2016) Effect
of interface plasticity on circular blisters. Scripta
Materialia 113:222-225.
4. Coupeau C, Durinck J, Drouet M, Douat B, Bonneville J,
Colin J and Grilhé J (2015) Atomic reconstruction of
niobium (111) surfaces. Surface Science 632:60-63.
5. Colin J, Coupeau C, Durinck J, Cimetière A and Grilhé J
(2014) Re-deposition of a straight-sided buckle under
pressure. Physical Review E 89:032410.
Biography
Jérôme Colin works in the field of the Mechanics of Materials and Mate-
rials Science. He is involved in modeling of the mechanical properties of
nano-structured materials, thin films on substrates and coatings. More
precisely, he has developed models in the framework of the elasticity and
thermodynamics theories, to characterize the morphological evolution of
layers under strain, the formation of atomic defects such as dislocations
in strained nanostructures or the delamination and buckling of thin films on
substrates.
Morphological instability of thin films deposited on substrates
Jérôme Colin1, 2
1Université de Poitiers, France
2ENSMA, France
Jérôme Colin, Nano Res Appl, Volume:4
DOI: 10.21767/2471-9838-C1-008