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5 results on '"F. Pettinari"'

1. Formation processes of the ω-Al 70 Cu 20 Fe 10 phase synthesized by SPS technique

Author

A. Joulain, V. Gauthier-Brunet, Sylvain Dubois, Joël Douin, François Brisset, Christophe Tromas, Jean-Philippe Monchoux, A. Joseph, Joël Bonneville, F. Pettinari, Institut Pprime (PPRIME), Université de Poitiers-Centre National de la Recherche Scientifique (CNRS)-ENSMA, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UPS), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, ENSMA, ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers, Physique de la Plasticité et Métallurgie (CEMES-PPM), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Centre Hospitalier Universitaire d'Angers (CHU Angers), PRES Université Nantes Angers Le Mans (UNAM), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Materials science, Scanning electron microscope, Mechanical Engineering, Metals and Alloys, Analytical chemistry, Spark plasma sintering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Field emission microscopy, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], Crystallography, Mechanics of Materials, Powder metallurgy, Phase (matter), 0103 physical sciences, Materials Chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Graphite, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, Eutectic system
Abstract

The ω-Al 70 Cu 20 Fe 10 phase formation processes have been investigated for two types of samples synthesized by Spark Plasma Sintering: model samples with planar Al/Al-Cu-Fe interfaces produced from Al and icosahedral i-Al-Cu-Fe powder beds superimposed in a graphite die and Al/Al-Cu-Fe composites. For reactively sintered model samples, the ω-Al-Cu-Fe phase formation was studied using Field Emission Scanning Electron Microscopy coupled with Energy-Dispersive X-ray spectroscopy. In-situ Field Emission Scanning Electron Microscope with a heating stage was used to observe the microstructure evolution of initial Al/i-Al-Cu-Fe composites from room temperature up to 823 K. Observations and chemical analyses performed on the different types of samples show the presence of secondary phases such as θ-Al 2 Cu and AlCu together with the presence of an eutectic microstructure which indicate the formation of a transient liquid phase, during the formation of the ω-Al-Cu-Fe phase. The formation processes of the ω-Al-Cu-Fe phase suggested in this work highlight two different scenarii involving the Al enrichment of pre-existing i-Al-Cu-Fe particles and the filling of initial porosities via a liquid mediated reaction involving θ-Al 2 Cu and AlCu intermediate phases.

Published
2017
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2. Dynamic friction stresses in the γ phase of a nickel-based superalloy

Author

F. Pettinari, Armand Coujou, N. Clément, and Mustapha Jouiad

Subjects
Materials science, Physics and Astronomy (miscellaneous), Deformation (mechanics), Metallurgy, Metals and Alloys, Mechanics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Superalloy, Stress (mechanics), Phase (matter), General Materials Science, Dynamical friction, Dislocation, Softening, Solid solution
Abstract

In-situ deformation experiments were performed on single crystals of the short-range-order-containing γ phase of a nickel-based superalloy. The dislocation pile-ups moving under stress are used as a probe exploring this complex solid solution and giving precise information on the local glide resistance encountered. Their analysis gives access for the first time to several contributions to this glide resistance. The threshold friction stress, which pile-ups must overcome in order to move is equal to the dynamic friction stress, which the pile-up experiences when propagating at a constant velocity. In comparison, the glide resistances deduced from the analysis of relaxed configurations are shown to be significantly underestimated. The softening effect due to the destruction of short-range order is also quantitatively determined.

Published
1999
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3. Evaluation of friction stresses in the γ phase of a nickel-base superalloy ‘In situ’ deformation experiments

Author

F. Pettinari, Mustapha Jouiad, Armand Coujou, and N. Clément

Subjects
Materials science, Mechanical Engineering, Metallurgy, Plasticity, Condensed Matter Physics, Microstructure, Superalloy, Mechanics of Materials, Phase (matter), Head (vessel), General Materials Science, Dislocation, Deformation (engineering), Composite material, Pile
Abstract

Both ‘in situ’ experiments and ‘post mortem’ observations have been performed on single crystals from MC2 superalloy γ matrix. Based on the measurement of the dislocation positions within the observed pile ups, a method is proposed that allows the evaluation of friction stresses from the head to the tail of the moving or relaxed pile ups. It appears that friction stresses must be measured on mobile pile ups, when they are deduced from relaxed pile ups they are considerably underestimated.

Published
1997
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4. Temperature dependence of ordering in the ? -phase of Ni-based superalloys

Author

M. Prem, N. Clément, G. Krexner, and F. Pettinari-Sturmel

Subjects
Superalloy, Crystallography, Materials science, Scattering, Phase (matter), Analytical chemistry, General Materials Science, General Chemistry, Neutron scattering, Intensity (heat transfer)
Abstract

Short-range order (SRO) in model γ-phases of several Ni-based superalloys is investigated by elastic diffuse neutron scattering as a function of temperature. The composition of the single-crystalline samples has been modified by small amounts of additional elements like Mo, Re, Ru and W in order to study their influence on SRO, which is clearly dominated by peaks of the {1 1/2 0} type. The intensity of SRO scattering remains nearly unchanged up to 600 °C, above this temperature SRO decreases gradually and finally vanishes around 1000 °C. Correlation lengths do not change significantly with temperature.

Published
2002
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5. Quantitative measurements in in situ straining experiments in transmission electron microscopy

Author

Daniel Caillard, Armand Coujou, Alain Couret, F. Pettinari, N. Clément, and G. Molénat

Subjects
In situ, Histology, Materials science, Metallurgy, Intermetallic, chemistry.chemical_element, Pathology and Forensic Medicine, Superalloy, chemistry, Aluminium, Transmission electron microscopy, Phase (matter), Metallic materials, Dislocation, Composite material
Abstract

Several examples of recent studies by in situ straining experiments in a transmission electron microscope performed in the Toulouse group (France) are presented. In particular, quantitative measurements of the features of the dislocation motion are described. These examples deal with individual or collective propagation of dislocations, which are submitted to various types of obstacle. Different metallic materials are investigated: magnesium, intermetallics, aluminium alloys and gamma phase of a superalloy.

Published
2001

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