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References

2010

Articles:

Appolaire, Benoit, Aeby-Gautier, Elisabeth, Teixeira, Julien Da Costa, Dehmas, Moukrane and Denis, Sabine
Philisophical magazine, 90(1-4):461-483
2010
ISSN: 1478-6435

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

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

Ammar, Kais, Appolaire, Benoit, Cailletaud, Georges and Forest, Samuel
European Journal of Computational Mechanics, 18(5-6):485-523
2009
ISSN: 1779-7179

Equipe: Département SI2M : Microstructures et Contraintes

Ammar, Kais, Appolaire, Benoit, Cailletaud, Georges, Feyel, Frederic and Forest, Samuel
Computational Materials Science, 45(3):800-805
2009
ISSN: 0927-0256

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:

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

Appolaire, Benoit, Combeau, Hervé and Lesoult, Gérard
Materials Science and Engineering: A, 487(1-2):33-45
2008
ISSN: 0921-5093

Equipe: Département SI2M : Microstructures et Contraintes

Teixeira, Julien Da Costa, Appolaire, Benoit, Aeby-Gautier, Elisabeth, Denis, Sabine and Hericher, Ludovic
COMPUTATIONAL MATERIALS SCIENCE, 42(2):266-280
2008
ISSN: 0927-0256

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.
Journal of Materials, 59(1):54-58
2007
ISSN: 1047-4838

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

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