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References

2011

Articles:

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

Grigorieva, Raisa, Drillett, Pascal, Mataigne, J. -M. and Redjaïmia, A.
Solid State Phenomena, 172-174(Part 1):784-790
2011
ISSN: 1012-0394

Resume: Nowadays more and more hot stamped steel sheets dedicated for the automotive body-in-white structure are pre-coated to prevent the steel surface against iron oxidation and decarburization during the austenitization step. For these applications, the coating is deposited by continuous hot-dipping the steel in an Al-Si bath. The Al-Si coating, at the delivery state, contains Al-grains, Al-Fe-Si ternary phases, Al-Fe binary phases. During the austenitization, the Al-Si coating transforms completely by inter-diffusion and solidification reactions. The mechanisms of Al-Fe-Si phase transformations at high temperature are almost unknown. The phase transformations occurring during austenitization define the final coating microstructure responsible for the in use properties of the product like spot welding, painting adherence or corrosion behavior. It is the aim of this paper to propose a new way of understanding the mechanisms of phase transformation in the Al-Si coating during the austenitization step (between 900 and 930 degrees C) before the transfer into the hot-stamping press.

Equipe: Département SI2M : Microstructures et Contraintes

Mourot, Mickael, Courleux, Alice, Dehmas, Moukrane, Gautier, Elisabeth, Geandier, Guillaume, Dezellus, Olivier, Claude Viala, Jean, Martin, Olivier, Karnatak, Nikhil and Danoix, Frederic
Solid State Phenomena, 172-174:747-752
2011

Equipe: Département SI2M : Microstructures et Contraintes

2009

Articles:

Longuet, A., Robert, Y., Aeby-Gautier, E., Appolaire, B., Mariage, J. F., Colin, C. and Cailletaud, G.
Computational Material Science, 46(3):761-766
2009
ISSN: 0927-0256

Resume: A multiphase model for Ti-6Al-4V is proposed. This material is widely used in industrial applications and so needs accurate behaviour modeling. Tests have been performed in the temperature range from 25 degrees C to 1020 degrees C and at strain rates between 10(-3) s(-1) and 1 s(-1). This allowed the identification of a multiphase mechanical model coupled with a metallurgical model. The behaviour of each phase is calibrated by solving an inverse problem including a phase transformation model and a mechanical model to simulate tests under thermomechanical loadings. A scale transition rule (beta-rule) is proposed in order to represent the redistribution of local stresses linked to the heterogeneity of plastic strain. Finally this model is applied to two laser assisted processes: direct laser fabrication and laser welding. (C) 2009 Elsevier B.V. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

Maniana, M., Azim, A., Rhanim, H. and Archambault, P.
International Journal of Thermal Sciences, 48:795--804
2009

Equipe: Département SI2M : Microstructures et Contraintes

Horwat, D., Dehmas, M., Aubry, E., Zollinger, J., Migot, S. and Pierson, J. F.
Intermetallics, 17(6):421-426
2009
ISSN: 0966-9795

Resume: WxZr1-x thin films were deposited at room temperature on glass substrates by co-sputtering tungsten and zirconium targets in argon. The composition was found in the range 0 <= x <= 0.81. The grain size deduced from X-ray diffraction analysis ranged from 1.3 nm to 16 nm depending on the composition. The events in the resistivity, optical reflectivity and thickness evolutions were correlated with the X-ray diffraction analysis. Depending on the composition, the local organization can be attributed to a nanocrystalline solid solution of W in Zr, to a nanocomposite structure involving ZrW2 nanograins embedded in an amorphous matrix. to ZrW2 Laves phase nanograins and to a nanocrystalline solid solution of Zr in W. For 0 < x <= 0.72, the equivalent grain size is very small (less than 2 nm) and the evolution of the resistivity can be fitted by the estimated volume of the material perturbed by the grain boundaries. (C) 2008 Elsevier Ltd. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

2008

Articles:

Douce, J F., Bellot, J.P., Denis, S., Chaffotte, F., Pellegrino, G., Gouhinec, F., Lamesle, P. and Maury, J.
International Journal of Microstructure and Materials Properties, 3(1):150
2008
ISSN: 1741-8429

Equipe: Département SI2M : Microstructures et Contraintes

Bruneseaux, Fabien, Aeby-Gautier, Elisabeth, Geandier, Guillaume, Teixeira, Julien Da Costa, Appolaire, Benoit, Weisbecker, Patrick and Mauro, Anthony
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 476(1-2):60-68
2008
ISSN: 0921-5093

Resume: The beta(BCC) -> alpha(HCP) + beta(BCC) phase transformation kinetics of the beta-metastable titanium alloy Ti17 was studied by in situ high energy X-ray diffraction (XRD) and electrical resistivity. The use of synchrotron radiation (E = 89.12 keV, lambda = 0.01402 nm) allowed to characterize specimens 6 mm in diameter, limiting thus oxidation effects. The alpha + beta -> beta phase transformation kinetics was characterized during continuous heating up to the P temperature range. The beta -> alpha + beta transformation was studied in isothermal conditions (dwell at 708 degrees C or 750 degrees C) and during continuous cooling (cooling rates of 0.05 degrees C/s, 0.1 degrees C/s and 0.61 degrees C/s). The evolutions of the phase fractions are analyzed and compared to kinetics measured by electrical resistivity, showing a good correlation between both methods. In addition, the evolutions of the cell parameters of each phase obtained from XRD patterns are analyzed in regard of the transformation kinetics. (C) 2007 Elsevier B.V. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

Morniroli, J. P., Houdellier, F., Roucau, C., Puiggali, J., Gesti, S. and Redjaïmia, A.
Ultramicroscopy, 108 (2)(2):100-115
2008
ISSN: 0304-3991

Resume: By combining the large-angle convergent-beam electron diffraction (LACBED) configuration together with a microscope equipped with a C., corrector it is possible to obtain good quality spot patterns in image mode and not in diffraction mode as it is usually the case. These patterns have two main advantages with respect to the conventional selected-area electron diffraction (SAED) or microdiffraction patterns. They display a much larger number of reflections and the diffracted intensity is the integrated intensity. These patterns have strong similarities with the electron precession patterns and they can be used for various applications like the identification of the possible space groups of a crystal from observations of the Lane zones or the ab-initio structure identifications. Since this is a defocused method, another important application concerns the analysis of electron beam-sensitive materials. Successful applications to polymers are given in the present paper to prove the validity of this method with regards to these materials. (c) 2007 Elsevier B.V. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

2007

Articles:

Morniroli, J. P., Redjaïmia, A. and Nicolopoulos, S.
Ultramicroscopy, 107(6-7):514-522
2007
ISSN: 0304-3991

Resume: In a previous study, it was reported that the possible space groups of a crystal can be identified at a microscopic or nanoscopic scale, thanks to microdiffraction patterns obtained with a nearly parallel electron incident beam focused on a very small area of the specimen. A systematic method was proposed, which consists of the observation of a few microdiffraction patterns displaying at least two Laue zones. These microdiffraction patterns can also be obtained by using an electron precession equipment. In this case, the patterns display a very large number of reflections in the Laue zones whose intensity is the integrated intensity. These original features greatly facilitate the space group identification method and are particularly useful when the high-order Laue zones (HOLZ) are not visible on microdiffraction patterns or when very thin specimens are not available. (c) 2006 Elsevier B.V. All rights reserved.

Equipe: Département SI2M : Microstructures et Contraintes

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