This file was created by the Typo3 extension sevenpack version 0.7.16 --- Timezone: CET Creation date: 2021-03-02 Creation time: 15-48-47 --- Number of references 74 article Djaziri:2014 Journal of Applied Physics 2014 116 093504 Département SI2M : Microstructures et Contraintes 10.1063/1.4894616 S.Djaziri P.-O.Renault E.Le Bourhis Ph.Goudeau D.Faurie G.Geandier C.Mocuta D.Thiaudière article Geandier:2014 Journal of Applied Crystallography 2014 47 181-187 Département SI2M : Microstructures et Contraintes 10.1107/S1600576713030720 G.Geandier D.Faurie P.-O.Renault D.Thiaudière E.Le Bourhis article Geandier:2014b Journal of heat treatments and materials 2014 69 54--59 Département SI2M : Microstructures et Contraintes 10.3139/105.110206 G.Geandier M.Dehmas M.Mourot E.Aeby-Gautier S.Denis O.Martin N.Karnatak article Esin:2014 Acta Materialia 2014 80 118--131 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.actamat.2014.07.042 Elsevier BV 1359-6454 10.1016/j.actamat.2014.07.042 V.A.Esin B.Denand Q.Le Bihan M.Dehmas J.Teixeira G.Geandier S.Denis T.Sourmail E.Aeby-Gautier article Perevoshchikova2014 Computational Materials Science 2014 82 151-158 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.commatsci.2013.09.047 Elsevier 10.1016/j.commatsci.2013.09.047 NataliyaPerevoshchikova BenoitAppolaire JulienTeixeira ElisabethAeby-Gautier SabineDenis article Chambrier:2013 Inorganic Chemistry 2014 53 (1) 147-159 Département SI2M : Microstructures et Contraintes dx.doi.org/10.1021/ic401801u M-HChambrier A.Le Bail F.Giovanelli ARedjaïmia P.Florian D.Massiot E.Suard F.Goutenoire article Faurie:2014 Applied Surface Science 2014 306 70--74 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.apsusc.2014.02.032 Elsevier BV 0169-4332 10.1016/j.apsusc.2014.02.032 D.Faurie P.-O.Renault E.Le Bourhis G.Geandier P.Goudeau D.Thiaudière article Jeanmaire:2014 Materials Characterization 2014 98 193-201 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.matchar.2014.11.001 Elsevier BV 1044-5803 10.1016/j.matchar.2014.11.001 G.Jeanmaire M.Dehmas A.Redjaïmia S.PUECH G.Fribourg article Grosseau-Poussard:2014 Advances in Science and Technology 2014 91 100???107 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.4028/www.scientific.net/AST.91.100 Trans Tech Publications 1662-0356 10.4028/www.scientific.net/ast.91.100 Jean LucGrosseau-Poussard MathieuGuerain PhilippeGoudeau GuillaumeGeandier BenoitPanicaud NobumichiTamura MartinKunz CatherineDejoie Jean SebastienMicha article Beneteau:2014 Acta Materialia 2014 81 30--40 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.actamat.2014.07.050 Elsevier BV 1359-6454 10.1016/j.actamat.2014.07.050 AdelineBénéteau ElisabethAeby-Gautier GuillaumeGeandier PatrickWeisbecker AbdelkrimRedjaimia BenoitAppolaire article Badinier:2014 Materials Science &amp; Engineering A 2014 597 10-19 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.msea.2013.12.03 G.Badinier C.W.Sinclair S.Allain O.Bouaziz article Daoudi2014 Thermochimica Acta 2014 577 5-10 Département SI2M : Microstructures et Contraintes 10.1016/j.tca.2013.12.007 MouradIbrahim Daoudi AbdelhafidTriki AbdelkrimRedjaimia ChihaouiYamina article Pushkareva:2013 ISIJ International 2013 53 1215-1223 Département SI2M : Microstructures et Contraintes 10.2355/isijinternational.53.1215 I.Pushkareva C.Scott M.Goune N.Valle A.Redjaïmia AMoulin article Geandier:2013 Materials Science Forum 2013 768-769 313-320 Département SI2M : Microstructures et Contraintes 10.4028/www.scientific.net/MSF.768-769.313 G.Geandier M.Dehmas M.Mourot E.Aeby-Gautier S.Denis O.Martin N.Karnatak article Devynck:2013 Key Engineering Materials 2013 554--557 1530--1538 Département SI2M : Microstructures et Contraintes 10.4028/www.scientific.net/KEM.554-557.1530 S.Devynck M.Gradeck J.P.Bellot S.Denis G.Maigrat M.Varlez T.Benard article Salib:2013 Acta Materialia 2013 61 3758-3768 Département SI2M : Microstructures et Contraintes 10.1016/j.actamat.2013.03.007 M.Salib J.Teixeira L.Germain E.Lamielle N.Gey E.Aeby-Gautier article Dehmas:2013 Metallurgical and Materials Transactions A 2013 44 (2) 1059-1073 Département SI2M : Microstructures et Contraintes 10.1007/s11661-012-1473-1 M.Dehmas E.Aeby-Gautier P.Archambault M.Serrière article Aeby-Gautier:2013 Journal of Alloys and Compounds 2013 5775 439-443 Département SI2M : Microstructures et Contraintes 10.1016/j.jallcom.2012.02.046 E.Aeby-Gautier A.Settefrati F.Bruneseaux B.Appolaire B.Denand M.Dehmas G.Geandier P.Boulet article Settefrati:2013 Materials Science Forum 2013 738-739 97-102 proceedings Conférence ESOMAT 2012 Département SI2M : Microstructures et Contraintes doi:10.4028/www.scientific.net/MSF.738-739.97 A.Settefrati E.Aeby-Gautier B.Appolaire M.Dehmas G.Geandier G.Khelifat article KOUTSOUKIS:2013 Material Science and Engineering A 2013 561 477--485 Département SI2M : Microstructures et Contraintes DOI: http://dx.doi.org/10.1016/j.msea.2012.10.066 T.Koutsoukis A.Redjaïmia G.Fourlaris article Faurie:2013 Thin Solid Films 2013 530 25-29 Département SI2M : Microstructures et Contraintes doi:10.1016/j.tsf.2012.02.031 D.Faurie G.Geandier P.-O.Renault E.Le Bourhis D.Thiaudière article LANDEGHEM:2013 Scripta Materialia 2013 68 187--190 Département SI2M : Microstructures et Contraintes DOI: http://dx.doi.org/10.1016/j.scriptamat.2012.10.014 H.P.Van Landeghem M.Goune T.Epicier A.Redjaïmia article Djaziri:2013 Acta Materialia 2013 61 5067--5077 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.actamat.2013.04.031 S.Djaziri D.Faurie P.-O.Renault E.Le Bourhis Ph.Goudeau G.Geandier D.Thiaudière article PEREVOSHCHIKOVA:2012 Computational Material Science 2012 61 54--66 Département SI2M : Microstructures et Contraintes 10.1016/j.commatsci.2012.03.050 N.Peresvochchikova B.Appolaire J.Teixeira E.Aeby-Gautier S.Denis article DEVYNCK:2012 Key Engineering Materials 2012 504-506 1049-1054 Département SI2M : Microstructures et Contraintes 10.4028/www.scientific.net/KEM.504-506.1049 S.Devynck M.Gradeck J.P.Bellot S.Denis M.Vaelez T.Benard article Brunetti:2012 Micron 2012 43 2-3 396-406 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. Département SI2M : Microstructures et Contraintes 0968-4328 10.1016/j.micron.2011.10.009 G.Brunetti A.Settefrati A.Hazotte S.Denis J. -J.Fundenberger A.Tidu E.Bouzy article Horwat2012 Chemistry of materials 2012 24 (3) 2429-2432 Département SI2M : Microstructures et Contraintes 10.1021/cm301179x D.Horwat M.Dehmas A.GUTIERREZ J.F.Pierson A.Anders F.SOLDERA J.L.Endrino article Horwat:2012 Journal of Physics and Chemistry of solids 2012 73 4 554-558 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. Département SI2M : Microstructures et Contraintes 0022-3697 10.1016/j.jpcs.2011.12.009 D.Horwat E.JIMENEZ-PIQUE J. F.Pierson S.Migot M.Dehmas M.Anglada article VanLandeghem:2012a Steel Research International 2012 83 (6) 590--593 Département SI2M : Microstructures et Contraintes DOI: 10.1002/srin.201100264 H.Van Landeghem M.Goune A.Redjaïmia article VanLandeghem:2012b Journal of Crystal Growth 2012 341 (1) 53-60 Département SI2M : Microstructures et Contraintes DOI: 10.1016/j.jcrysgro.2011.12.056 H.Van Landeghem M.Goune A.Redjaïmia article Dehmas2012 Matériaux et techniques 2012 100 103-105 Département SI2M : Microstructures et Contraintes www.mattech-journal.org Edp sciences MoukraneDehmas MatthieuSalib GuillaumeGeandier ElisabethGautier NikhilKarnatak OlivierMartin article Geandier2012 Comptes Rendus Physique 2012 13 3 257-267 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. Département SI2M : Microstructures et Contraintes 1631-0705 10.1016/j.crhy.2011.12.001 G.Geandier E.Aeby-Gautier A.Settefrati M.Dehmas B.Appolaire article Borgese:2012 Surface and Coatings Technology 2012 206 8-9 2459-2463 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. Département SI2M : Microstructures et Contraintes 0257-8972 10.1016/j.surfcoat.2011.10.050 L.Borgese M.Gelfi E.Bontempi P.Goudeau G.Geandier D.Thiaudière L. E.Depero article Perevoshchikova:2011 Solid State Phenomena 2011 172-174 Part 1 1214-1219 We have adapted the Quickhull algorithm with the general dimension Beneath-Beyond algorithm <prt>[</prt>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. Département SI2M : Microstructures et Contraintes Brechet, Y and Clouet, E and Deschamps, A and Finel, A and Soisson, F Solid State Phenomena SOLID-SOLID PHASE TRANSFORMATIONS IN INORGANIC MATERIALS, PTS 1-2 Mat &amp; Process Sci &amp; Engn Lab; CEA, Tranverse Programme Adv Mat; French Aerospace Lab; Inst Chem, Natl Ctr Sci Res; French Phase Field Network; Lab Etude Microstructures 1012-0394 10.4028/www.scientific.net/SSP.172-174.1214 BenoitAppolaire NataliyaPerevoshchikova JulienTeixeira SabineDenis article Pushkareva:2011 Solid State Phenomena 2011 172-174 Part 1 839-844 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. Département SI2M : Microstructures et Contraintes Brechet, Y and Clouet, E and Deschamps, A and Finel, A and Soisson, F Solid State Phenomena SOLID-SOLID PHASE TRANSFORMATIONS IN INORGANIC MATERIALS, PTS 1-2 Mat &amp; Process Sci &amp; Engn Lab; CEA, Tranverse Programme Adv Mat; French Aerospace Lab; Inst Chem, Natl Ctr Sci Res; French Phase Field Network; Lab Etude Microstructures 1012-0394 10.4028/www.scientific.net/SSP.172-174.839 IrinaPushkareva AbdelkrimRedjaimia AntoineMoulin NathalieValle article dehmas:2011c Solid State Phenomena 2011 172-174 396-401 Département SI2M : Microstructures et Contraintes M.Dehmas J.Kovac E.Aeby-Gautier B.Appolaire B.Denand J.Da-Costa-Teixeira article Koutsoukis:2011 Solid State Phenomena 2011 172-174 Part 1 493-498 Superaustenitic stainless steels exhibit excellent corrosion resistance, at a wide variety of exposure temperatures, especially in chloride containing environments, coupled with desirable mechanical properties. Previous studies have shown that these steels are prone to precipitation of secondary phases, such as sigma phase (sigma), chi phase (chi). Laves-phase, carbides, nitrides or secondary austenite, when exposed at elevated temperatures, directly affecting their mechanical properties and corrosion behaviour. A detailed study of the effect of isothermal ageing on the microstructure of S32654 (Fe-24Cr-21Ni-7Mo-0.5N-0.013C) and S31254 (Fe-20Cr-18Ni-6Mo-0.2N-0.012C) superaustenitic stainless steels was carried out. Samples were aged within the temperature range of 650 degrees C to 950 degrees C for times up to 3000 h. Following ageing, precipitation of secondary phases was clearly observed with precipitates varying in volume fraction, size, shape and spatial distribution. Several secondary phases were identified via transmission electron microscopy (TEM) and electron diffraction (ED). The orientation relationships between the austenitic matrix and the secondary phases were identified. Interaction and also phase transformation among different types of precipitates, such as between precipitates and the austenitic matrix were observed and an attempt of understanding these phase transformations was carried out. Département SI2M : Microstructures et Contraintes Brechet, Y and Clouet, E and Deschamps, A and Finel, A and Soisson, F Solid State Phenomena SOLID-SOLID PHASE TRANSFORMATIONS IN INORGANIC MATERIALS, PTS 1-2 Mat &amp; Process Sci &amp; Engn Lab; CEA, Tranverse Programme Adv Mat; French Aerospace Lab; Inst Chem, Natl Ctr Sci Res; French Phase Field Network; Lab Etude Microstructures 1012-0394 10.4028/www.scientific.net/SSP.172-174.493 T.Koutsoukis A.Redjaïmia G.Fourlaris article DAOUDI:2011a Journal of Thermal Analysis and Calorimetry 2011 104 (2) 627-633 Département SI2M : Microstructures et Contraintes 10.1007/s10973-010-1099-8 M.Daoudi A.Triki A.Redjaïmia article Berveiller:2011 Acta Materialia 2011 59 9 3636-3645 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. Département SI2M : Microstructures et Contraintes 1359-6454 10.1016/j.actamat.2011.02.037 S.Berveiller B.Malard J.Wright E.Patoor G.Geandier article Hell:2011a ISIJ International 2011 51 10 1724-1732 We elaborated two carbide-free bainitic steels with different microstructures through specific alloy design and austempering process. Microstructural characterizations were performed by means of EBSD analysis and in-situ high energy synchrotron diffraction in order to evaluate the phase fractions and the carbon content in the retained austenite, as well as the microtextures. These microstructural features were correlated to the tensile properties. Both steels exhibited an excellent compromise between high strength (above 1 250 MPa), good ductility (uniform elongation up to 14%) and high fracture strain (reduction of area up to 46%). The volume fraction of MA blocks (blocks of retained austenite partially transformed into fresh martensite during the final cooling at room temperature) was a key relevant parameter that strongly influenced the work-hardening at the expense of the damaging processes at high strain. Département SI2M : Microstructures et Contraintes 0915-1559 Jean-ChristopheHell MoukraneDehmas SebastienAllain Juscelino MendesPrado AlainHazotte Jean-PhilippeChateau article Borgese:2011 Acta Materialia 2011 59 7 2891-2900 Amorphous TiO2 thin films were deposited by means of atomic layer deposition on Kapton substrates and then crystallized ex situ by annealing at 300 degrees C to obtain the anatase phase. The morphology, structure and microstructure of films treated for 12, 24, 72 and 90 h were investigated. The local Ti coordination changes were studied by X-ray near-edge structure (XANES). On the basis of X-ray diffraction residual stress calculations, the elastic anisotropy of the films is experimentally determined for the first time (A<prt>*</prt>(comp) = 0.07, A<prt>*</prt>(shear) = 0.03). The film macro-strains increased with the time of treatment, while the micro-strains decreased. This effect may be correlated with the incipient anatase-to-rutile transformation as suggested by the changes observed in the XANES pattern of the film treated for 90 h. However, the contribution of the substrate cannot be excluded. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Département SI2M : Microstructures et Contraintes 1359-6454 10.1016/j.actamat.2011.01.032 L.Borgese E.Bontempi M.Gelfi L. E.Depero P.Goudeau G.Geandier D.Thiaudière article Napoli:2011 Solid State Phenomena 2011 172-174 1044-1049 Département SI2M : Microstructures et Contraintes P.Di Napoli B.Appolaire E.Aeby-Gautier A.A. Bénéteau article Grigorieva2011 Solid State Phenomena 2011 172-174 Part 1 784-790 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. Département SI2M : Microstructures et Contraintes Brechet, Y and Clouet, E and Deschamps, A and Finel, A and Soisson, F Solid State Phenomena SOLID-SOLID PHASE TRANSFORMATIONS IN INORGANIC MATERIALS, PTS 1-2 Mat &amp; Process Sci &amp; Engn Lab; CEA, Tranverse Programme Adv Mat; French Aerospace Lab; Inst Chem, Natl Ctr Sci Res; French Phase Field Network; Lab Etude Microstructures 1012-0394 10.4028/www.scientific.net/SSP.172-174.784 RaisaGrigorieva PascalDrillett J. -M.Mataigne A.Redjaïmia article Settefrati:2011 Solid State Phenomena 2011 172-174 Part 1 760-765 In the present study we focus on the precipitation processes during heating and ageing of beta-metastable phase in the near beta Ti-5553 alloy. Transformation processes have been studied using continuous high energy X-Ray Diffraction (XRD) and electrical resistivity for two different states of the beta-metastable phase. Microstructures have been observed by electron microscopy. Different transformation sequences are highlighted depending on both heating rate and chemical composition of the beta-metastable phase. At low temperatures and low heating rates, the hexagonal omega(iso) phase is first formed as generally mentioned in the literature. Increasing the temperature, XRD evidences the formation of an orthorhombic phase (alpha&quot;), which evolves toward the hexagonal pseudo compact alpha phase. For higher heating rates or for richer composition in beta-stabilizing elements of the beta-metastable phase, omega phase may not form and alpha&quot; forms directly and again transforms into alpha phase. A direct transformation from beta-metastable to alpha phase is observed for the highest heating rate. The formation of the metastable omega(iso) and alpha&quot; phases clearly influences the final morphology of alpha. Département SI2M : Microstructures et Contraintes Brechet, Y and Clouet, E and Deschamps, A and Finel, A and Soisson, F SOLID-SOLID PHASE TRANSFORMATIONS IN INORGANIC MATERIALS, PTS 1-2 Mat &amp; Process Sci &amp; Engn Lab; CEA, Tranverse Programme Adv Mat; French Aerospace Lab; Inst Chem, Natl Ctr Sci Res; French Phase Field Network; Lab Etude Microstructures 1012-0394 10.4028/www.scientific.net/SSP.172-174.760 A.Settefrati E.Aeby-Gautier M.Dehmas G.Geandier B.Appolaire S.Audion J.Delfosse article Dehmas:2011a Advances in Materials Science and Engineering 2011 2011 9 Inconel 718 is widely used because of its ability to retain strength at up to 650 degrees C for long periods of time through coherent metastable gamma `' Ni(3)Nb precipitation associated with a smaller volume fraction of gamma' Ni(3)Al precipitates. At very long ageing times at service temperature, gamma `' decomposes to the stable Ni(3)Nb delta phase. This latter phase is also present above the gamma `' solvus and is used for grain control during forging of alloy 718. While most works available on delta precipitation have been performed at temperatures below the gamma `' solvus, it appeared of interest to also investigate the case where delta phase precipitates directly fromthe fccmatrix free of gamma `' precipitates. This was studied by X-ray diffraction and transmission electron microscopy (TEM). TEM observations confirmed the presence of rotation-ordered domains in delta plates, and some unexpected contrast could be explained by double diffraction due to overlapping phases. Département SI2M : Microstructures et Contraintes 1687-6822 10.1155/2011/940634 MoukraneDehmas JacquesLacaze AliouNiang BernardViguier article Faurie:2011 Thin Solid Films 2011 520 5 1603-1607 Synchrotron x-ray radiation was used for in situ strain measurements in gold films on polyimide substrate during uniaxial deformation tests. We have used an area detector that allows inspecting multiple directions in the polycrystalline thin film without serial sectioning during straining. We show in this paper the configuration used and the attainable orientations on a pole figure for which the x-ray strains are measured. Moreover, we show the effect on the x-ray strains of the onset on plasticity, which was not detected by optical (macroscopic) strain measurement. (C) 2011 Elsevier B.V. All rights reserved. Département SI2M : Microstructures et Contraintes 0040-6090 10.1016/j.tsf.2011.07.059 D.Faurie P. -O.Renault G.Geandier E.Le Bourhis article Mourot:2011 Solid State Phenomena 2011 172-174 747-752 Département SI2M : Microstructures et Contraintes doi:10.4028/www.scientific.net/SSP.172-174.747 MickaelMourot AliceCourleux MoukraneDehmas ElisabethGautier GuillaumeGeandier OlivierDezellus JeanClaude Viala OlivierMartin NikhilKarnatak FredericDanoix article Daoudi:2010 Journal of Thermal Analysis and Calorimetry 2010 104 2 627-633 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1007/s10973-010-1099-8 Springer Science + Business Media 1572-8943 10.1007/s10973-010-1099-8 Mourad IbrahimDaoudi AbdelhafidTriki AbdelkrimRedjaimia article Lach:2012 International Journal of Microstructure and Materials Properties, 2010 5 (1) 65-78 Département SI2M : Microstructures et Contraintes E.Lach R.Schnitzer H.Letiner A.Redjaïmia H.Clemans article Xiong:2010a Scripta Materialia 2010 63 (12) 12 1232-1235 In situ transmission electron microscopy investigations were carried out on a supersaturated nitrogen ferrite to characterise the precipitation kinetics of alpha `'-Fe16N2 nitrides at 85 degrees C. The coarsening behaviour consists of two stages. The first stage obeys the LSW theory and the coarsening rate was determined as 11.2 nm(3) s(-1). The second stage corresponds to the stabilization of coarsening, and was assumed to be related to the coherency loss between the precipitates and the matrix. (c) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Département SI2M : Microstructures et Contraintes 1359-6462 10.1016/j.scriptamat.2010.08.045 X. C.Xiong A.Redjaïmia M.Goune article Combeau:2010 Nuclear Engineering and Design 2010 240 1975-1985 Département SI2M : Microstructures et Contraintes H.Combeau B.Appolaire J.M.Seiler article Appolaire:2010 Philisophical magazine 2010 90 1-4 461-483 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. Département SI2M : Microstructures et Contraintes 1478-6435 10.1080/14786430903334324 BenoitAppolaire ElisabethAeby-Gautier Julien Da CostaTeixeira MoukraneDehmas SabineDenis article Xiong:2010 Materials Characterization 2010 6 (11) 11 1245-1251 Acicular shaped crystals precipitate from gamma Fe4N nitride in an iron-nitrogen alloy and were identified by electron microdiffraction as alpha ferrite Acicular ferrite develops both the Nishiyama-Wassermann and the Kurdjumov-Sachs orientation relationships with gamma' Fe4N nitride These orientation relationships were discussed in terms of the symmetry theory The driving force for acicular ferrite formation was related to the increasing nitrogen content of gamma' Fe4N, in equilibrium with alpha ferrite, with decreasing temperature The passage from lamellar to acicular structure in Fe-N system was proposed (C) 2010 Elsevier Inc All rights reserved Département SI2M : Microstructures et Contraintes 1044-5803 10.1016/j.matchar.2010.08.005 X. C.Xiong A.Redjaïmia M.Goune article Longuet:2009 Computational Material Science 2009 46 3 761-766 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. Département SI2M : Microstructures et Contraintes Chinese Soc Theoret &amp; Appl Mech 0927-0256 10.1016/j.commatsci.2009.05.012 A.Longuet Y.Robert E.Aeby-Gautier B.Appolaire J. F.Mariage C.Colin G.Cailletaud article Ammar:2009a European Journal of Computational Mechanics 2009 18 5-6 485-523 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.3166/ejcm.18.485-523 Lavoisier 1779-7179 10.3166/ejcm.18.485-523 KaisAmmar BenoitAppolaire GeorgesCailletaud SamuelForest article Ammar:2009 Computational Materials Science 2009 45 3 800-805 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.commatsci.2008.09.015 Elsevier BV 0927-0256 10.1016/j.commatsci.2008.09.015 KaisAmmar BenoitAppolaire GeorgesCailletaud FredericFeyel SamuelForest article Xiong:2009 Journal of Materials Science 2009 44 2 632-638 In this study, hypoeutectoid Fe-N binary specimens have been prepared by gas nitriding pure iron in austenite domain at 840 A degrees C. The slow cooling of these specimens led to the alpha-ferrite + gamma'-Fe(4)N pearlitic microstructure which is similar to the pearlite in Fe-C binary system. This pearlitic microstructure has been characterized by electron microscopy. The crystal structure of the gamma'-Fe(4)N nitride has been identified by electron microdiffraction and the Nishiyama-Wassermann (N-W) and near Kurdjumov-Sachs (K-S) orientation relationships have been found between the alpha-ferrite and the gamma'-Fe(4)N. Département SI2M : Microstructures et Contraintes 0022-2461 10.1007/s10853-008-3054-7 X. C.Xiong A.Redjaïmia M.Goune article Maniana:2009 International Journal of Thermal Sciences 2009 48 795--804 Département SI2M : Microstructures et Contraintes doi:10.1016/j.ijthermalsci.2008.05.018 M.Maniana A.Azim H.Rhanim P.Archambault article Horwat:2009 Intermetallics 2009 17 6 421-426 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 &lt;= x &lt;= 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 &lt; x &lt;= 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. Département SI2M : Microstructures et Contraintes 0966-9795 10.1016/j.intermet.2008.11.020 D.Horwat M.Dehmas E.Aubry J.Zollinger S.Migot J. F.Pierson article Hutchinson:2009 Acta Materialia 2009 57 19 5645-5653 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.actamat.2009.07.060 Elsevier BV 1359-6454 10.1016/j.actamat.2009.07.060 C.R.Hutchinson P.T.Loo T.J.Bastow A.J.Hill J.da Costa Teixeira article CostaTeixeira:2009 Acta Materialia 2009 57 20 6075-6089 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.actamat.2009.08.034 Elsevier BV 1359-6454 10.1016/j.actamat.2009.08.034 J.da Costa Teixeira L.Bourgeois C.W.Sinclair C.R.Hutchinson article Dehmas:2008 Traitements Thermiques 2008 389 43-46 Département SI2M : Microstructures et Contraintes MokuraneDehmas article Douce:2008 International Journal of Microstructure and Materials Properties 2008 3 1 150 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1504/IJMMP.2008.018399 Inderscience Publishers 1741-8429 10.1504/ijmmp.2008.018399 J F.Douce J.P.Bellot S.Denis F.Chaffotte G.Pellegrino F.Gouhinec P.Lamesle J.Maury article frechard:2008 Materials Science and Engineering A 2008 480 89-95 Département SI2M : Microstructures et Contraintes S.Fréchard A.Redjaïmia E.Lach A.Lichtenberger article Daoudi:2008 Algerian Journal of Advanced Materials 2008 5 13 Département SI2M : Microstructures et Contraintes M.I.Daoudi A.Triki A.Redjaïmia article Bruneseaux:2008 MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 2008 476 1-2 60-68 The beta(BCC) -&gt; 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 -&gt; beta phase transformation kinetics was characterized during continuous heating up to the P temperature range. The beta -&gt; 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. Département SI2M : Microstructures et Contraintes 0921-5093 10.1016/j.msea.2007.04.072 FabienBruneseaux ElisabethAeby-Gautier GuillaumeGeandier Julien Da CostaTeixeira BenoitAppolaire PatrickWeisbecker AnthonyMauro article Morniroli:2008 Ultramicroscopy 2008 108 (2) 2 100-115 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. Département SI2M : Microstructures et Contraintes 0304-3991 10.1016/j.ultramic.2007.03.006 J. P.Morniroli F.Houdellier C.Roucau J.Puiggali S.Gesti A.Redjaïmia article Appolaire:2008 Materials Science and Engineering: A 2008 487 1-2 33-45 Département SI2M : Microstructures et Contraintes http://dx.doi.org/10.1016/j.msea.2007.11.030 Elsevier BV 0921-5093 10.1016/j.msea.2007.11.030 BenoitAppolaire HervéCombeau GérardLesoult article Teixeira:2008a COMPUTATIONAL MATERIALS SCIENCE 2008 42 2 266-280 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. Département SI2M : Microstructures et Contraintes 0927-0256 10.1016/j.commatsci.2007.07.056 Julien Da CostaTeixeira BenoitAppolaire ElisabethAeby-Gautier SabineDenis LudovicHericher article Morniroli:2007 Ultramicroscopy 2007 107 6-7 514-522 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. Département SI2M : Microstructures et Contraintes Free Univ Brussels 0304-3991 10.1016/j.ultramic.2006.03.013 J. P.Morniroli A.Redjaïmia S.Nicolopoulos article Morniroli:2007a Journal of microscopy 2007 227 2 157-171 The possible space groups of a crystal can be identified from a few zone axis microdiffraction patterns provided the position (and not the intensity) of the reflections on the patterns is taken into account. The method is based on the observation of the shifts and the periodicity differences between the reflections located in the first-order Lane zone (FOLZ) with respect to the ones located in the zero-order Laue zone (ZOLZ). Electron precession microdiffraction patterns display more reflections in the ZOLZ and in the FOLZ than in the conventional microdiffraction patterns and this number increases with the precession angle. It is shown, from the TiAl example given in the present study. that this interesting feature brings a strong beneficial effect for the identification of the possible space groups since it becomes very easy to identify unambiguously the FOLZ/ZOLZ shifts and periodicity differences. In addition. the diffracted intensity on the precession patterns is the integrated intensitv and this intensity can also be used to identify the Laue class. Département SI2M : Microstructures et Contraintes 0022-2720 10.1111/j.1365-2818.2007.01800.x J.-P.Morniroli A.Redjaïmia article Aeby-Gautier:2007 Journal of Materials 2007 59 1 54-58 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. Département SI2M : Département SI2M : Microstructures et Contraintes 1047-4838 10.1007/s11837-007-0011-x E.Aeby-Gautier F.Bruneseaux J. Da CostaTeixeira B.Appolaire G.Geandier S.Denis article Hutchinson:2007a Acta Materialia 2007 55 1 213-223 A physically based process model for the room temperature yield strength of an age-hardenable alloy subject to selected monotonic non-isothermal heat treatment schedules is developed and used to examine the possible efficiencies in processing and enhancements in strength that may be realistically achieved. `Processing Maps' are generated which illustrate both the yield strengths achievable and the processing routes necessary to achieve them, as well as estimates of the energy consumed in the thermal treatment. A Fe-2Cu (wt.%) alloy is used as an example and the results of physical experiments are compared with the model predictions. For the conditions examined, enhancements in yield strength of similar to 8% above those achievable in comparable isothermal treatments are illustrated with 65% of the energy input. Alternatively, similar yield strengths to those from comparable isothermal treatment are shown to be achievable with similar to 35% of the energy input. The physical origins of the observed effects and the potential implications of coupled process-property optimization are considered. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Département SI2M : Microstructures et Contraintes 1359-6454 10.1016/j.actamat.2006.07.028 C.R.Hutchinson M.Goune A.Redjaïmia article Teixeira:2007 MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 2007 448 1-2 135-145 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. Département SI2M : Microstructures et Contraintes 0921-5093 10.1016/j.msea.2006.10.024 Julien Da CostaTeixeira BenoitAppolaire ElisabethAeby-Gautier SabineDenis GeorgesCailletaud NadineSpath