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Auteur Nadjet Rouag |
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Titre : Caractérisation des textures de films AlN : Évolution au cours de la croissance et influence sur les propriétés d’utilisation. Type de document : texte imprimé Auteurs : Badis Riah, Auteur ; Nadjet Rouag, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 119 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique:Sciences des Matériaux AlN hexagonal AlN cubique texture Fibre Épitaxie PVD DCMS HiPIMS DRX hexagonal AlN cubic AlN epitaxy XRD تباين المناحي الألياف النمو المثالي إنعراج الأشعة السينية (DRX) Index. décimale : 530 Physique Résumé : The objective of this thesis is to study the influence of anisotropy on the quality of AlN thin films, developed by two physical vapor deposition (PVD) techniques, DCMS and HiPIMS. AlN exists in two phases: a stable hexagonal phase and a cubic one generally considered as metastable. We are interested particularly in highlighting the last mentioned phase. For this, we have analyzed the texture of several series of AlN films deposited on different substrates of different nature and orientations by X-ray diffraction (XRD). The hexagonal phase is present under the form of fiber (0001), with reinforcements more or less remarkable, when the film is deposited on Si substrate of orientations (100) and (111). It is important to mention that the fiber (0001) can be tilted with respect to the normal of the substrate, mainly when the thickness increases. The use of SiC-6H substrate with lattice agreement with AlN, makes epitaxial growth possible at a temperature from 200 to 250 °C. Following the diffracted intensity has shown the absence of epitaxial growth of AlN (PVD), at low temperatures, on a composite substrate of AlN Kyma/Si (111). Furthermore, the use of AlN buffer layer, 2 nm thick, developed at high temperatures, makes the epitaxial growth of AlN (PVD) possible on Si (111) and at low temperatures. The XRD texture analysis allowed, as well, the highlighting of the AlN cubic phase. This cubic phase was carefully studied especially when it is not much mentioned in literature. We have shown that it is a transition layer between hAlN transition and the Si (100) substrate. The AlN cubic phase shows a crystalline response with several orientations for two methods, DCMS and HiPIMS, with a higher intensity in the case of DCMS. The lattice mismatch between the different structures and orientations confirm that the growth of hexagonal AlN under the form of (0001) fiber is facilitated by the presence of this AlN cubic phase.
Note de contenu : Annexes. Diplôme : Doctorat En ligne : ../theses/physique/RIA7502.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11335 Caractérisation des textures de films AlN : Évolution au cours de la croissance et influence sur les propriétés d’utilisation. [texte imprimé] / Badis Riah, Auteur ; Nadjet Rouag, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 119 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique:Sciences des Matériaux AlN hexagonal AlN cubique texture Fibre Épitaxie PVD DCMS HiPIMS DRX hexagonal AlN cubic AlN epitaxy XRD تباين المناحي الألياف النمو المثالي إنعراج الأشعة السينية (DRX) Index. décimale : 530 Physique Résumé : The objective of this thesis is to study the influence of anisotropy on the quality of AlN thin films, developed by two physical vapor deposition (PVD) techniques, DCMS and HiPIMS. AlN exists in two phases: a stable hexagonal phase and a cubic one generally considered as metastable. We are interested particularly in highlighting the last mentioned phase. For this, we have analyzed the texture of several series of AlN films deposited on different substrates of different nature and orientations by X-ray diffraction (XRD). The hexagonal phase is present under the form of fiber (0001), with reinforcements more or less remarkable, when the film is deposited on Si substrate of orientations (100) and (111). It is important to mention that the fiber (0001) can be tilted with respect to the normal of the substrate, mainly when the thickness increases. The use of SiC-6H substrate with lattice agreement with AlN, makes epitaxial growth possible at a temperature from 200 to 250 °C. Following the diffracted intensity has shown the absence of epitaxial growth of AlN (PVD), at low temperatures, on a composite substrate of AlN Kyma/Si (111). Furthermore, the use of AlN buffer layer, 2 nm thick, developed at high temperatures, makes the epitaxial growth of AlN (PVD) possible on Si (111) and at low temperatures. The XRD texture analysis allowed, as well, the highlighting of the AlN cubic phase. This cubic phase was carefully studied especially when it is not much mentioned in literature. We have shown that it is a transition layer between hAlN transition and the Si (100) substrate. The AlN cubic phase shows a crystalline response with several orientations for two methods, DCMS and HiPIMS, with a higher intensity in the case of DCMS. The lattice mismatch between the different structures and orientations confirm that the growth of hexagonal AlN under the form of (0001) fiber is facilitated by the presence of this AlN cubic phase.
Note de contenu : Annexes. Diplôme : Doctorat En ligne : ../theses/physique/RIA7502.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11335 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité RIA/7502 RIA/7502 Thèse Bibliothèque principale Thèses Disponible Etude de l’influence de l’anisotropie sur la recristallisation et la croissance des grains. / Abdelhak Ayad
Titre : Etude de l’influence de l’anisotropie sur la recristallisation et la croissance des grains. : Simulation et application aux aciers IF. Type de document : texte imprimé Auteurs : Abdelhak Ayad, Auteur ; Nadjet Rouag, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 132 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Aciers IF DRX EBSD Monte Carlo croissance normale cinétique texture distribution de
tailles de grains désorientations recristallisation déformation IF steels XRD normal grain growth kinetics grain size
distribution misorientation recrystallization deformation
الفولادIF النمو العادي للحبيبات حركية البنيةالنسيجية توزيع حجم الحبيبات تباين الاتجاهات إعادةالبلورة الأولية تشوهDRXIndex. décimale : 530 Physique Résumé : The present study is a contribution to understanding and modeling the microstructural mechanisms that control the changes in the crystallographic texture during recrystallization and grain growth. Our aim is to determine the characteristics that allow the following of texture evolutions and identifying the fundamental mechanisms that govern this evolution, in order to model the normal grain growth stage, in IF steel. The comparison of grain growth simulation results with the experimental behavior requires initial data for the model development and final data for its validation. For this, a detailed experimental study was performed of primary recrystallization grain growth stages, starting from 75% rolled state. We characterized the crystallographic texture, global by XRD and local by EBSD, in parallel of following the recrystallized fractions, the grain sizes and misorientations distributions and the kinetics of recrystallization and grain growth. For the simulation of normal grain growth, a modified version of the Monte Carlo technique was implemented. An original concept, using a consideration of an adjustable effect of grain size, has been introduced. This concept is based on the role of certain subpopulations of grains in the control of the final texture. It allows not only better account for the pressure at the grain boundaries but also accelerates significantly large calculations. The introduction of such grain size parameter allows to
control the growth kinetics and generates the parabolic law (n = 2), predicted by theory. In addition, the self-similarity of the distribution of grain sizes is preserved and the distributions obtained are in agreement with the experimental observations. In all simulations, the intensity of the component {111} <110> increases and reaches a level that corresponds to the experimental reality. The intensity of component {111} <112> increases slightly in all calculations, which opposes to the experimental trend which provides a slight decrease of this component. It should be noted that the introduced grain size parameter has a very limited effect on the texture evolution in our model.Diplôme : Doctorat en sciences En ligne : ../theses/physique/AYA6373.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6339 Etude de l’influence de l’anisotropie sur la recristallisation et la croissance des grains. : Simulation et application aux aciers IF. [texte imprimé] / Abdelhak Ayad, Auteur ; Nadjet Rouag, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2013 . - 132 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Aciers IF DRX EBSD Monte Carlo croissance normale cinétique texture distribution de
tailles de grains désorientations recristallisation déformation IF steels XRD normal grain growth kinetics grain size
distribution misorientation recrystallization deformation
الفولادIF النمو العادي للحبيبات حركية البنيةالنسيجية توزيع حجم الحبيبات تباين الاتجاهات إعادةالبلورة الأولية تشوهDRXIndex. décimale : 530 Physique Résumé : The present study is a contribution to understanding and modeling the microstructural mechanisms that control the changes in the crystallographic texture during recrystallization and grain growth. Our aim is to determine the characteristics that allow the following of texture evolutions and identifying the fundamental mechanisms that govern this evolution, in order to model the normal grain growth stage, in IF steel. The comparison of grain growth simulation results with the experimental behavior requires initial data for the model development and final data for its validation. For this, a detailed experimental study was performed of primary recrystallization grain growth stages, starting from 75% rolled state. We characterized the crystallographic texture, global by XRD and local by EBSD, in parallel of following the recrystallized fractions, the grain sizes and misorientations distributions and the kinetics of recrystallization and grain growth. For the simulation of normal grain growth, a modified version of the Monte Carlo technique was implemented. An original concept, using a consideration of an adjustable effect of grain size, has been introduced. This concept is based on the role of certain subpopulations of grains in the control of the final texture. It allows not only better account for the pressure at the grain boundaries but also accelerates significantly large calculations. The introduction of such grain size parameter allows to
control the growth kinetics and generates the parabolic law (n = 2), predicted by theory. In addition, the self-similarity of the distribution of grain sizes is preserved and the distributions obtained are in agreement with the experimental observations. In all simulations, the intensity of the component {111} <110> increases and reaches a level that corresponds to the experimental reality. The intensity of component {111} <112> increases slightly in all calculations, which opposes to the experimental trend which provides a slight decrease of this component. It should be noted that the introduced grain size parameter has a very limited effect on the texture evolution in our model.Diplôme : Doctorat en sciences En ligne : ../theses/physique/AYA6373.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6339 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité AYA/6373 AYA/6373 Thèse Bibliothèque principale Thèses Disponible Documents numériques
texte intégraleAdobe Acrobat PDF
Titre : Influence de la texture cristallographique et de la spécialité des joints de grains sur l'anisotropie de migration des joints entourant un grain d'orientation (110) 001au cours des premiers stades de la recristallisation secondaire dans des t?les de Type de document : texte imprimé Auteurs : Nadjet Rouag ; Université de Paris-sud, Éditeur scientifique ; Jean. Philibert, Directeur de thèse Année de publication : 1988 Importance : 121 p. Note générale : 01 Disponible à la salle de recherche Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Texture Métal Migration Recristallisation Joint de grain Index. décimale : 530 Physique Permalink : index.php?lvl=notice_display&id=3158 Influence de la texture cristallographique et de la spécialité des joints de grains sur l'anisotropie de migration des joints entourant un grain d'orientation (110) 001au cours des premiers stades de la recristallisation secondaire dans des t?les de [texte imprimé] / Nadjet Rouag ; Université de Paris-sud, Éditeur scientifique ; Jean. Philibert, Directeur de thèse . - 1988 . - 121 p.
01 Disponible à la salle de recherche
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Texture Métal Migration Recristallisation Joint de grain Index. décimale : 530 Physique Permalink : index.php?lvl=notice_display&id=3158 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité ROU/1736 ROU/1736 Thèse Bibliothèque principale Thèses Disponible
