59 results on '"Armand Coujou"'
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52. Transmission electron microscopy study of precipitate morphology and precipitate overcoming processes in aluminum alloy 6056 T6
- Author
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Armand Coujou, Christophe Levaillant, Marie Vivas, Alain Couret, Marie-José Casanove, Philippe Lours, Centre Matériaux - Ecole des Mines Albi-Carmaux, IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Centre d'élaboration de matériaux et d'études structurales (CEMES), 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), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), 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), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)
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Materials science ,Alloy ,chemistry.chemical_element ,Precipitate shearing ,02 engineering and technology ,engineering.material ,01 natural sciences ,[SPI]Engineering Sciences [physics] ,High resolution electron microscopy ,Aluminium ,0103 physical sciences ,General Materials Science ,010302 applied physics ,Precipitation (chemistry) ,Mechanical Engineering ,Metallurgy ,Aluminum alloy 6056 T6 ,Precipitate morphology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,chemistry ,Mechanics of Materials ,Transmission electron microscopy ,In situ straining experiments ,engineering ,Dislocation ,0210 nano-technology - Abstract
11th International Conference on the Strength of Materials (ICSMA-11), PRAGUE, CZECH REPUBLIC, AUG 25-29, 1997; International audience; High resolution electron microscopy and in situ straining experiments are performed on aluminum alloy 6056 T6 to charaterize the morphology of precipitates and the processes of precipitate overcoming by the dislocations. Two types of precipitates (needles and laths) are identified. They are found to be sheared by the dislocations and the maximum force precipitates can sustain before being sheared is calculated.
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- 1997
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53. A microscopy study of precipitate distribution and precipitate overcoming processes in a aluminium alloy 6056 T6
- Author
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Marie Vivas, PHILIPPE LOURS, Christophe Levaillant, Alain Couret, Marie-José Casanove, Armand Coujou, Centre Matériaux - Ecole des Mines Albi-Carmaux, IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)
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[SPI]Engineering Sciences [physics] ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 1997
54. Interactions between dislocations and ?/?' interfaces in superalloys
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Armand Coujou, L. Priester, N. Clément, and M. Benyoucef
- Subjects
Stress (mechanics) ,Superalloy ,Crystallography ,Materials science ,Chemical physics ,Transmission electron microscopy ,General Materials Science ,Deformation (engineering) ,Dislocation ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials - Abstract
“In situ” transmission electron microscopy observations of the dislocation motion at vicinity of the γ/γ' interfaces in a Ni-base superalloy have been performed. They allow to identify the elemental mechanisms, under stress and at different temperatures, of the deformation propagation across the interfaces. It is shown that some of the mechanisms already analyzed in the literature occur. Moreover, new processes are revealed such as the formation of small dislocation pile-ups on the γ/γ' interfaces. Such a configuration, which increases the local stress, favors the overcoming of the interface.
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- 1997
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55. Some aspects of precipitation hardening in aluminum alloy 6056 T6 - TEM experiments
- Author
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Marie-José Casanove, Marie Vivas, Philippe Lours, Armand Coujou, Christophe Levaillant, Alain Couret, Centre Matériaux - Ecole des Mines Albi-Carmaux, IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Centre d'élaboration de matériaux et d'études structurales (CEMES), 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), Driver, JH and Dubost, B and Durand, F and Fougeres, R and Guyot, P and Sainfort, P and Suery, Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), 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), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)
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Materials science ,HRTEM ,TEM in situ straining ,Alloy ,02 engineering and technology ,Thermal treatment ,engineering.material ,Flow stress ,Corrosion ,[SPI]Engineering Sciences [physics] ,Precipitation hardening ,0203 mechanical engineering ,Ultimate tensile strength ,General Materials Science ,High-resolution transmission electron microscopy ,dislocation-precipitate interaction ,dislocation ,Mechanical Engineering ,Metallurgy ,technology, industry, and agriculture ,equipment and supplies ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,020303 mechanical engineering & transports ,Mechanics of Materials ,engineering ,flow stress ,Dislocation ,0210 nano-technology ,aluminum alloy 6056 ,precipitation hardening - Abstract
5th International Conference on Aluminium Alloys - Their Physical and Mechanical Properties (ICAA5), GRENOBLE, FRANCE, JUL 01-05, 1996; International audience; Due to enhanced mechanical and corrosion resistance properties, aluminum alloy 6056 T6 might substitute for commonly used 2024 alloy in the manufacturing of aircraft fuselage skins. To understand the mechanical properties of this precipitation hardening alloy, tensile tests, HRTEM analysis and TEM in situ straining technique are used. The variation of the flow stress with temperature is first investigated. Then, the morphologies of the precipitates promoted by the T6 thermal treatment are analysed. Finally, few in situ straining experiments are presented. They show how dislocations interact with precipitates under controlled conditions of load and temperature.
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- 1996
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56. Transmission of the deformation through γ-γ interfaces in a polysynthetically twinned TiAl alloy I. Ordered domain interfaces (120° rotational)
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Zghal, Armand Coujou, Alain Couret, Slim, primary
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- 2001
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57. {111} Glide in Ni3Al at room temperature.In situobservations under weak-beam conditions
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Philippe Lours, Armand Coujou, D. Caillard, Alain Couret, and N. Clément
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In situ ,Crystallography ,Materials science ,Condensed matter physics ,Condensed Matter Physics - Abstract
In situexperiments are performed in Ni3AL at room temperature. We observe reversible changes of antiphase boundary (APB) planes between {111} and {100}, and movements in {111} planes controlled by the crossing of sessile positions with the APB plane in {111}.
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- 1988
- Full Text
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58. On the strengthening of aluminium alloy 6056T6
- Author
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Marie Vivas, PHILIPPE LOURS, Christophe Levaillant, Marie-José Casanove, Alain Couret, Armand Coujou, Centre Matériaux - Ecole des Mines Albi-Carmaux, IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)
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[SPI]Engineering Sciences [physics] ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
59. Characterisation of short-range order using dislocations
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Joël Douin, N. Clément, Florence Pettinari-Sturmel, and Armand Coujou
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Superalloy ,Crystallography ,Materials science ,Micrometer scale ,Condensed matter physics ,Phase (matter) ,Short range order ,Materials Chemistry ,Metals and Alloys ,Dislocation ,Physical and Theoretical Chemistry ,Condensed Matter Physics - Abstract
The mobile dislocation pile-ups observed during in situ straining experiments have been used as probes to describe the short-range order (SRO) present in the γ phase of nickel-base superalloys. An experimental approach, based on the measurement of the dislocation positions, to characterise the SRO has been developed. This paper focuses on the main results we have obtained on this topic. A quantitative analysis allows to get the chemical forces associated with SRO, and also the SRO degree. For the first time, the energies associated with SRO are evaluated along a dislocation pile-up as a function of temperature. More generally, a description of the SRO is proposed: SRO is seen as a heterogeneous distribution at the micrometer scale of nanometric areas. Another characteristic has been evidenced: the reversible character of the SRO creation.
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