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--- Timezone: CET
Creation date: 2021-01-27
Creation time: 21-58-52
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2
article
Morniroli:2008
LACDIF, a New Electron Diffraction Technique Obtained with the LACBED Configuration and a Cs Corrector. Comparaison with Electron Precession.
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
Teixeira:2008a
Modeling of the phase transformations in near-beta titanium alloys during the cooling after forging
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