Papers by Author: Jean-Jacques Fundenberger

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Authors: Satyam Suwas, André Eberhardt, László S. Tóth, Jean-Jacques Fundenberger, Thierry Grosdidier
Abstract: The amount of stored energy of cold work for the processing routes A and Bc of Equal Channel Angular Extrusion (ECAE) process has been measured using differential scanning calorimetry. The study is preceded by the effect of amount of ECAE deformation on materials of different stacking fault energies, namely Cu and Ag. The results indicate that the different processing routes have significant effect on the stored energy, which is likely to affect the grain refinement process.
1325
Authors: Jean-Jacques Fundenberger, Adam Morawiec, Emmanuel Bouzy
Abstract: The paper is an account of TEM based automatic orientation mapping summarizing more than two years of using the system. Following a brief introduction of the system elements, some representative applications are described. We focus on the characterization of fine-grain materials, mapping of low symmetry materials (metastable chromium carbide) and semi-automatic analysis of misorientations in a fully lamellar polycrystalline (g+a2) TiAl alloy. Moreover, the current state of the TEM based system is discussed and compared to EBSD systems. In particular, the issues of spatial resolution, accuracy, map acquisition time, reliability are considered.
37
Authors: R. Arruffat-Massion, S. Suwas, László S. Tóth, Werner Skrotzki, Jean-Jacques Fundenberger, André Eberhardt
Abstract: FCC metals with different stacking fault energy (SFE), namely Al, Ag and Cu have been investigated for the evolution of crystallographic texture during ECAE deformation using Route A. Different materials with different SFE result in their characteristic textures. The results have been analysed on the basis of microstructural features and related established concepts on texture evolution in FCC metals.
839
Authors: D. Goran, Jean-Jacques Fundenberger, Satyam Suwas, Emmanuel Bouzy, László S. Tóth, Werner Skrotzki, Thierry Grosdidier
Abstract: Texture and microstructure were investigated after 1 pass equal channel angular extrusion (ECAE) of a single crystal cube oriented Ni billet. Neutron and X-ray diffraction were used to determine global and local textures, respectively. EBSD and TEM investigations were also carried out in order to study fine scale microstructural features. Substantial variations in texture and microstructure, resulting from different efficiencies in the shearing process, were locally recorded through the billet height. The deformation was heterogeneous on both micro and macro scales.
833
Authors: Emmanuel Bouzy, Jean-Jacques Fundenberger, Thierry Grosdidier
691
Authors: Thierry Grosdidier, Bernard Bolle, J.D. Puerta Velásquez, J.X. Zou, Jean-Jacques Fundenberger, Nathalie Allain-Bonasso, P. Chevrier, Albert Tidu
Abstract: This paper reviews some recent results concerning surface integrity of materials processed with two important developing techniques: high speed machining (HSM) – here applied to the difficult case of Ti alloys – and low energy high current pulsed electron beam (LEHCPEB) surface treatment of steels. The effect of the processing parameters on the development of microstructure, texture and residual stresses is detailed for modifications occurring both at the surfaces and sub-surfaces.
9
Authors: Jean-Jacques Fundenberger, Emmanuel Bouzy, Adam Morawiec, Jean Sébastien Lecomte
209
Authors: D. Goran, Jean-Jacques Fundenberger, Satyam Suwas, Emmanuel Bouzy, László S. Tóth, Werner Skrotzki, Thierry Grosdidier
Abstract: Texture and microstructure were investigated after 1 pass equal channel angular extrusion (ECAE) of a single crystal cube oriented Ni billet. Neutron and X-ray diffraction were used to determine global and local textures, respectively. To investigate the fine scale microstructural features EBSD was used. Substantial variations in texture and microstructure resulting from different efficiencies in the shearing process were locally recorded through the billet height.
333
Authors: Henryk Paul, Adam Morawiec, Emmanuel Bouzy, Jean-Jacques Fundenberger, Andrzej Piątkowski
Abstract: The local crystallography within shear bands (SB) has been examined in a single crystal of {112}<111> orientation of pure copper deformed at 77K by channel-die compression to strains of about 1. Setting up a system for making high-resolution orientation maps using transmission electron microscopy (TEM) has opened new advantageous circumstances for the analysis of orientation changes within SB. This method with spatial resolution higher than 10nm allows the examination of microstructure images composed of nanoscale subcells forming SB. It has been found that for well-developed shear bands, a crystal lattice rotation about <112> direction tends to dominate and this process is usually accompanied by activation of new slip systems. The present work shows that despite the plane strain deformation mode, the mechanism of lattice rotation within emerging SBs may lead to Goss and Brass texture components.
1067
Authors: Thierry Grosdidier, Jean-Jacques Fundenberger, Francis Wagner
535
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