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References

Articles:
2014
•	Esin, V.A., Denand, B., Le Bihan, Q., Dehmas, M., Teixeira, J., Geandier, G., Denis, S., Sourmail, T. and Aeby-Gautier, E. In situ synchrotron X-ray diffraction and dilatometric study of austenite formation in a multi-component steel: Influence of initial microstructure and heating rate Acta Materialia, 80:118--131 2014 ISSN: 1359-6454 DOI: 10.1016/j.actamat.2014.07.042 http://dx.doi.org/10.1016/j.actamat.2014.07.042 Equipe: Département SI2M : Microstructures et Contraintes
•	Perevoshchikova, Nataliya, Appolaire, Benoit, Teixeira, Julien, Aeby-Gautier, Elisabeth and Denis, Sabine Investigation of the growth kinetics of gamma -> alpha in Fe-C-X alloys with a thick interface model Computational Materials Science, 82:151-158 2014 DOI: 10.1016/j.commatsci.2013.09.047 http://dx.doi.org/10.1016/j.commatsci.2013.09.047 Equipe: Département SI2M : Microstructures et Contraintes
2013
Articles:
•	Salib, M., Teixeira, J., Germain, L., Lamielle, E., Gey, N. and Aeby-Gautier, E. Influence of transformation temperature on microtexture formation associated with alpha precipitation at beta grain boundaries in a beta metastable titanium alloy Acta Materialia, 61:3758-3768 2013 DOI: 10.1016/j.actamat.2013.03.007 Equipe: Département SI2M : Microstructures et Contraintes
2012
Articles:
•	Peresvochchikova, N., Appolaire, B., Teixeira, J., Aeby-Gautier, E. and Denis, S. A convex hull algorithm for a grid minimization of Gibbs energy as initial step in equilibrium calculations in two-phase multicomonent alloys Computational Material Science, 61:54--66 2012 DOI: 10.1016/j.commatsci.2012.03.050 Equipe: Département SI2M : Microstructures et Contraintes
2011
Articles:
•	Appolaire, Benoit, Perevoshchikova, Nataliya, Teixeira, Julien and Denis, Sabine A convex hull algorithm for minimization of Gibbs energy in two-phase multicomponent alloys Solid State Phenomena, 172-174(Part 1):1214-1219 2011 ISSN: 1012-0394 DOI: 10.4028/www.scientific.net/SSP.172-174.1214 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
2010
Articles:
•	Appolaire, Benoit, Aeby-Gautier, Elisabeth, Teixeira, Julien Da Costa, Dehmas, Moukrane and Denis, Sabine Non-coherent interfaces in diffuse interface models Philisophical magazine, 90(1-4):461-483 2010 ISSN: 1478-6435 DOI: 10.1080/14786430903334324 Resume: We propose a description of incoherent and semi-coherent interfaces within the framework of diffuse interface modelling: accounting for the discontinuity of tangential displacements is an issue addressed by introducing a new field, called the incoherency field, located in the diffuse interface and able to release the shear stresses tangential to the interface. After having demonstrated the ability of the model to recover trends obtained by sharp interface models of sliding interfaces, the process of loss of coherency is investigated by assuming a local process which would result from the competition between the shear stress release at the interface and the interfacial energy increase. Equipe: Département SI2M : Microstructures et Contraintes
2008
Articles:
•	Bruneseaux, Fabien, Aeby-Gautier, Elisabeth, Geandier, Guillaume, Teixeira, Julien Da Costa, Appolaire, Benoit, Weisbecker, Patrick and Mauro, Anthony In situ characterizations of phase transformations kinetics in the Ti17 titanium alloy by electrical resistivity and high temperature synchrotron X-ray diffraction MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 476(1-2):60-68 2008 ISSN: 0921-5093 DOI: 10.1016/j.msea.2007.04.072 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
•	Teixeira, Julien Da Costa, Appolaire, Benoit, Aeby-Gautier, Elisabeth, Denis, Sabine and Hericher, Ludovic Modeling of the phase transformations in near-beta titanium alloys during the cooling after forging COMPUTATIONAL MATERIALS SCIENCE, 42(2):266-280 2008 ISSN: 0927-0256 DOI: 10.1016/j.commatsci.2007.07.056 Resume: A complete modeling of the phase transformation during the cooling following the forging has been carried out for near-beta titanium alloys. To that aim, we have improved a model predicting the influence of the deformation of the beta phase on the alpha phase precipitation during isothermal treatments, by extending its range of application to the case of cooling treatments. In particular, the precipitation of the intragranular morphology alpha(WI) has been introduced. We have proceeded step by step: calculations of heat treatments without any previous forging have first been performed. Then, the influence of the initial beta grain size have been studied. Finally, the influence of a previous deformation coming from the forging has been investigated. At each step, the calculations have been compared to some experiments, showing an good overall agreement. (C) 2007 Elsevier B.V. All rights reserved. Equipe: Département SI2M : Microstructures et Contraintes
2007
Articles:
•	Aeby-Gautier, E., Bruneseaux, F., Teixeira, J. Da Costa, Appolaire, B., Geandier, G. and Denis, S. Microstructural formation in Ti alloys: In-situ characterization of phase transformation kinetics Journal of Materials, 59(1):54-58 2007 ISSN: 1047-4838 DOI: 10.1007/s11837-007-0011-x Resume: The prediction of microstructure during processing needs to characterize the phase transformation occurring during the thermal treatments and their kinetics. In-situ high-energy synchrotron x-ray diffraction experiments performed during temperature variations allow the characterization of the phase evolution. For some transformation conditions, the continuous recording of diffraction diagrams evidences clearly intermediate phases. The quantitative analysis of the diffraction diagrams gives the transformation kinetics of each phase as well as their cell parameters. Transformation kinetics obtained by this method are compared to results obtained by electrical resistivity. Equipe: Département SI2M : Département SI2M : Microstructures et Contraintes
•	Teixeira, Julien Da Costa, Appolaire, Benoit, Aeby-Gautier, Elisabeth, Denis, Sabine, Cailletaud, Georges and Spath, Nadine Transformation kinetics and microstructures of Ti17 titanium alloy during continuous cooling MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 448(1-2):135-145 2007 ISSN: 0921-5093 DOI: 10.1016/j.msea.2006.10.024 Resume: We have investigated the microstructure evolutions in the Ti17 near beta titanium alloy during heat treatments. The phase transformation has first been studied experimentally by combining X-ray diffraction analysis, electrical resistivity and microscopy observations. From a series of isothermal treatments. a IT diauram has been determined, which takes into account the different morphologies. Then, a Johnson-Mehl-Avrami-Kolmogorov (JMAK) model has been successfully used to describe the phase transformation kinetics during either isothermal or cooling treatments. Finally, the coupling of the JMAK model to the finite element software ZeBuLoN allowed us to investigate the evolution of the spatial distribution of the different morphologies during the cooling of an aircraft engine shaft disk after forging. (c) 2006 Elsevier B.V. All rights reserved. Equipe: Département SI2M : Microstructures et Contraintes

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