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References

2014

Articles:

Perevoshchikova, Nataliya, Appolaire, Benoit, Teixeira, Julien, Aeby-Gautier, Elisabeth and Denis, Sabine
Computational Materials Science, 82:151-158
2014

Equipe: Département SI2M : Microstructures et Contraintes

Jeanmaire, G., Dehmas, M., Redjaïmia, A., PUECH, S. and Fribourg, G.
Materials Characterization, 98:193-201
2014
ISSN: 1044-5803

Equipe: Département SI2M : Microstructures et Contraintes

Grosseau-Poussard, Jean Luc, Guerain, Mathieu, Goudeau, Philippe, Geandier, Guillaume, Panicaud, Benoit, Tamura, Nobumichi, Kunz, Martin, Dejoie, Catherine and Micha, Jean Sebastien
Advances in Science and Technology, 91:100???107
2014
ISSN: 1662-0356

Equipe: Département SI2M : Microstructures et Contraintes

2013

Articles:

Pushkareva, I., Scott, C., Goune, M., Valle, N., Redjaïmia, A. and Moulin, A
ISIJ International, 53:1215-1223
2013

Equipe: Département SI2M : Microstructures et Contraintes

2012

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

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

2011

Articles:

Appolaire, Benoit, Perevoshchikova, Nataliya, Teixeira, Julien and Denis, Sabine
Solid State Phenomena, 172-174(Part 1):1214-1219
2011
ISSN: 1012-0394

Resume: We have adapted the Quickhull algorithm with the general dimension Beneath-Beyond algorithm [6] for computing the convex hull of the Gibbs energy hypersurface of multicomponent two-phase alloys. We illustrate the salient features of our method with calculations of isothermal ferrite-austenite equilibria in Fe-C-Cr. Finally, successive equilibrium calculations in a Fe-C-Cr-Mo steel over a large temperature range show the benefit of computing the convex hull before performing the conventional Newton-Raphson search.

Equipe: Département SI2M : Microstructures et Contraintes

Pushkareva, Irina, Redjaimia, Abdelkrim, Moulin, Antoine and Valle, Nathalie
Solid State Phenomena, 172-174(Part 1):839-844
2011
ISSN: 1012-0394

Resume: A detailed analysis of the evolution of industrial Dual Phase (DP) steel microstructures is carried out as a function of various annealing and tempering conditions. Advanced characterization techniques such as Parallel Electron Energy Loss Spectroscopy (PEELS) in the TEM and high spatial resolution Secondary Ion Mass Spectrometry (NanoSIMS) are employed in order to provide qualitative and quantitative measurements of local carbon concentration in the martensite. For certain annealing and tempering conditions, it is observed that local variations in carbon levels have occurred inside the individual martensite islands. These carbon variations strongly influence the damage behaviour of the steel. During tensile tests, a clear dependence of the damage mode on the local martensite carbon content is observed. Better knowledge of the relationship between the microstructure evolution at the sub-grain level and the damage behaviour can facilitate the design of DP steels with improved damage resistance.

Equipe: Département SI2M : Microstructures et Contraintes

Berveiller, S., Malard, B., Wright, J., Patoor, E. and Geandier, G.
Acta Materialia, 59(9):3636-3645
2011
ISSN: 1359-6454

Resume: Two synchrotron diffraction techniques, three-dimensional X-ray diffraction and Laue microdiffraction, are applied to studying the deformation behaviour of individual grains embedded in a Cu(74)Al(23)Be(3) superelastic shape memory alloy. The average lattice rotation and the intragranular heterogeneity of orientations are measured during in situ tensile tests at room temperature for four grains of mean size similar to 1 mm. During mechanical loading, all four grains rotate and the mean rotation angle increases with austenite deformation. As the martensitic transformation occurs, the rotation becomes more pronounced, and the grain orientation splits into several sub-domains: the austenite orientation varies on both sides of the martensite variant. The mean disorientation is similar to 1 degrees. Upon unloading, the sub-domains collapse and reverse rotation is observed. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

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