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Articles:

Peresvochchikova, N., Appolaire, B., Teixeira, J., Aeby-Gautier, E. and Denis, S.
Computational Material Science, 61:54--66
2012

Equipe: Département SI2M : Microstructures et Contraintes

Devynck, S., Gradeck, M., Bellot, J.P., Denis, S., Vaelez, M. and Benard, T.
Key Engineering Materials, 504-506:1049-1054
2012

Equipe: Département SI2M : Microstructures et Contraintes

Brunetti, G., Settefrati, A., Hazotte, A., Denis, S., Fundenberger, J. -J., Tidu, A. and Bouzy, E.
Micron, 43(2-3):396-406
2012
ISSN: 0968-4328

Resume: In single-crystal nickel-based superalloys, the lattice mismatch associated with interface coherency between gamma matrix and gamma' precipitates has a strong influence on mechanical properties. The unconstrained lattice misfit in a single-crystal of the MC2 nickel-based superalloy is determined using convergent beam electron diffraction measurements and finite element calculations. The apparent lattice parameters of both constrained phases are obtained in thin foils, using a new multi-pattern approach, which allows for unambiguous determination of all the lattice parameters considering the real symmetry of the strained crystals. Finite element calculations are used to establish relations between the constrained and unconstrained lattice parameters, with the stress relaxation resulting from the thin foil geometry taken into account. (C) 2011 Elsevier Ltd. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

Horwat, D., Dehmas, M., GUTIERREZ, A., Pierson, J.F., Anders, A., SOLDERA, F. and Endrino, J.L.
Chemistry of materials, 24 (3):2429-2432
2012

Equipe: Département SI2M : Microstructures et Contraintes

Horwat, D., JIMENEZ-PIQUE, E., Pierson, J. F., Migot, S., Dehmas, M. and Anglada, M.
Journal of Physics and Chemistry of solids, 73(4):554-558
2012
ISSN: 0022-3697

Resume: Zr1-xWx nanocrystalline films of Zr-W solid solutions and ZrW2 Laves phase were synthesized by magnetron co-sputtering. Large values of the H/E ratio up to 0.09 are observed for grain sizes in the nanometer range along with a hardness above 10 GPa and Young's modulus below 230 GPa. H/E values are correlated with the developed surface of grain boundaries suggesting an elastic deformation mostly handled by the grain boundaries. This is associated to friction coefficients comparable to those of metallic glass surfaces. In contrast to fragile bulk Laves phases, no cracks were detected at the film surface after indentation and scratch test of nanocrystalline ZrW2. The friction coefficient of such films against diamond tip was in the range 0.08-0.15, similarly to metallic glass surfaces. (C) 2011 Elsevier Ltd. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

Van Landeghem, H., Goune, M. and Redjaïmia, A.
Steel Research International, 83 (6):590--593
2012

Equipe: Département SI2M : Microstructures et Contraintes

Van Landeghem, H., Goune, M. and Redjaïmia, A.
Journal of Crystal Growth, 341 (1):53-60
2012

Equipe: Département SI2M : Microstructures et Contraintes

Dehmas, Moukrane, Salib, Matthieu, Geandier, Guillaume, Gautier, Elisabeth, Karnatak, Nikhil and Martin, Olivier
Matériaux et techniques, 100:103-105
2012

Equipe: Département SI2M : Microstructures et Contraintes

Geandier, G., Aeby-Gautier, E., Settefrati, A., Dehmas, M. and Appolaire, B.
Comptes Rendus Physique, 13(3):257-267
2012
ISSN: 1631-0705

Resume: High energy X-ray diffraction is a powerful tool, able to follow phase transformations during complex thermal or thermo-mechanical treatments. High energy allows one to study volumic specimens of a few mm(3) and get successive data within a few seconds or less. The technique is described with different experimental setups (heating devices, detectors for diverse acquisition times) allowing diverse ranges for heating and cooling rates. Three examples are considered to illustrate the results obtained by using high energy X-ray diffraction. The first one corresponds to a simple diffusive phase transformation during an isothermal thermal path for the alpha-beta transformation in a titanium alloy, highlighting the diffusive character considering the cell parameter evolutions of the parent phase. The second one illustrates the precipitation sequences observed during ageing of a beta-metastable phase in a titanium alloy that was not obtained by TEM. The last example illustrates the phase evolutions during ageing of a martensitic steel showing the complexity of cell parameters evolution and some evolutions of the stress state. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

Borgese, L., Gelfi, M., Bontempi, E., Goudeau, P., Geandier, G., Thiaudière, D. and Depero, L. E.
Surface and Coatings Technology, 206(8-9):2459-2463
2012
ISSN: 0257-8972

Resume: Atomic Layer Deposition (ALD) allows the deposition of thin films onto flat as well as complex geometry surfaces with excellent conformality. Thicknesses of few atomic layers can be achieved. Moreover, low-temperature deposition is possible and this enables the change of surface properties of many kinds of materials. Good adhesion characteristics and also good mechanical performance of ALD deposited thin films make the technique extremely interesting for several applications, as for example micro-electronics. TiO2 is a well studied semiconductor material because of its multifunctional properties that open a wide range of applications for example in photocatalysis, optics and solar cells. ALD is extremely completive to other technique, to deposit titania thin films, employed even to improve the biocompatibility of many kind of materials. TiO2 thin films are deposited with ALD technique at low temperature (90 degrees C) onto Kapton substrate and then crystallized ex-situ after annealing at 300 degrees C. X-ray diffraction (XRD) techniques are very suitable for the analysis of structure and microstructure of films and surface layers. In this work, XRD in combination with in situ tensile testing has been applied for the first time to measure elastic properties (elastic modulus and Poisson ratio) of TiO2 anatase thin films obtained by ALD. For the experimental conditions, the tensile stage was installed in a Synchrotron laboratory of Soleil. The information extracted from diffraction patterns is presented. (C) 2011 Elsevier B.V. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

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