Дисертації з теми "Alliages à base de Fe"
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Delamare, José. "Etude microstructurale d'alliages Nd-Fe et Nd-Fe-Al : corrélation aux phases secondaires des aimants Nd-Fe-B." Rouen, 1992. http://www.theses.fr/1992ROUES058.
Amri, Noureddine. "Etude métallurgique des systèmes Fe-Nd, Fe-Dy et Fe-Nd-Dy : existence et stabilité de phases." Rouen, 1993. http://www.theses.fr/1993ROUES041.
Debauge, Yves. "Alliages à base de palladium PdX (avec X = Fe, Cu) : caractérisation de surface et réactivité pour les réactions de dépollution et d'hydrogénation." Lyon 1, 1995. http://www.theses.fr/1995LYO10273.
Jemal, Ellouze Fatma. "Modélisation du comportement thermomécanique d'un alliage à mémoire de forme à base de fer type Fe-Mn-Si." Thesis, Nancy 1, 2009. http://www.theses.fr/2009NAN10135/document.
It is well known that Shape Memory Alloys (SMA) are a particular class of materials that can recover a memorized shape by simple heating. This remarkable property, called the Shape Memory Effect (SME), can be exploited in the design of original applications in order to find attractive solutions to problems encountered in various industrial fields. We propose a thermo-mechanical three-dimensional constitutive law adapted to Fe-based shape memory alloys. It takes into account the effect of the martensitic transformation and the plastic slip mechanisms and their interaction. The adopted formulation is based on a simplified micromechanical description. The macroscopic behaviour is derived by considering the equivalent homogeneous effect on a representative volume element. The Gibbs free energy expression is defined. Thermodynamic driving forces are then derived and compared to critical forces leading to the constitutive equations solved by Newton–Raphson numerical scheme. Obtained results for thermo-mechanical loadings are compared to experimental ones
Capute, Batalha Weverson. "Alliages amorphes à pseudo-haute entropie à base de fer : structure/microstructure, corrosion et propriétés mécaniques." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI098.
The quest for alternative materials to replace conventional stainless steel for marine applications has gained prominence recently. Among the emerging candidates, low-chromium Fe-based amorphous alloys have shown great promise, albeit needing a deeper understanding of their behavior. This research investigates the effect of devitrification on the corrosion and mechanical properties of two novel FeCrMoNbB and FeCrMoNiB pseudo high entropy amorphous compositions and their behavior when applied as coatings, shedding light on the critical role of passive film characterization.In the first stage, ribbons prepared through melt-spinning were subjected to annealing in an Ar protective atmosphere for simulation of crystallization. Corrosion tests were performed in a three-electrode cell, revealing the sensitivity of corrosion properties to the devitrification process, especially for the FeCrMoNbB composition in the first stages of crystallization. Both compositions presented outstanding corrosion properties in the amorphous state with a passivation plateau extending over 800mV relative to OCP. Electrochemical Spectroscopy Impedance (EIS) data was validated by Measurement Model software, and the Power Law model was applied to interpret the diagrams, allowing the calculation of resistivity at the metal/film interface (ρ0) for both alloys. The value of ρ0 was higher for the Nb-containing alloy, on the order of 1013 Ωcm2. X-ray photoelectron spectroscopy was applied for passive film study, and the compact passive layer composed of Cr, Nb, and Mo was linked to the superior corrosion resistance of the Nb-containing alloy compared to the Ni-containing one.Erosion-corrosion behavior was assessed using a disk of both compositions generated from commercial precursors' spray-forming process. Despite surface defects such as inherent pores and fissures resulting from the coating application process, both coatings exhibited hardness greater than three times that of conventionally used stainless steels. The erosion-corrosion behavior of the samples appeared to be significantly influenced by both porosity and particle oxidation. From an electrochemical perspective, as determined through Open Circuit Potential (OCP) measurements, it was impossible to differentiate between the two analyzed samples.In a subsequent step, coatings were applied using the DC magnetron sputtering technique, creating two compact, amorphous thin films with high hardness. The results from the coatings were comparable with those obtained from the ribbon samples. The passive film analysis via EIS and X-ray Photoelectron Spectroscopy XPS enabled the characterization of the passive films described by the Young model for the Nb-containing alloy and the Power Law model for the alloy containing Ni. Pitting was absent in the case of the Nb-containing coating, which exhibited markedly superior properties compared to the substrate.The comprehensive investigation of these Fe-based alloys offers valuable insights into their potential for marine and industrial applications, addressing corrosion and erosion-corrosion challenges. These materials have demonstrated outstanding performance and corrosion resistance, positioning them as viable alternatives to conventional stainless steels in harsh operating conditions
Zhang, Jiansheng. "Influence de la contrainte sur la transformation martensitique d'alliages Fe Ni C." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL092N.
Toffolon-Masclet, Caroline. "Etude metallurgique et calculs de diagrammes de phases des alliages base zirconium du systeme : zr-nb-fe-(o,sn)." Paris 6, 2000. http://www.theses.fr/2000PA066457.
Kellouch, Abdelhafid. "Stabilité, effet d'adition et propriétés d'intermétalliques et d'alliages à précipitation : étude numérique (ab initio) des bases Cu et Fe-Al." Besançon, 2004. http://www.theses.fr/2004BESA2002.
This work consists in applying a computational method based on the quantum mechanical calculations ( ab inition method) to metal alloys. This method is used to determine the general tendencies which characterize their behaviours as well as to improve their physical properties (mechanical, transport etc). The calculations were carried out to study the effects of the ternary additions 3d (Ti, V, Cr) and 4d (Zr, Nb, Mo) on the mechanical and transport properties of the Cu-Ag alloys as well as the effects of small atoms (B, C, N, O) and the deviation from the stoechiometry in the FeAl alloys. The stability of the second phases that can reinforce the pure matrix were also investigated: Laves structures for the Cr-Zr-Nb system and their behaviour at high temperatures in Cu-based alloys, Heusler structure Fe2AlTi and Fe2AlCr for FeAl. The calculations were also extended to the ultra-fine Cu/Ag and Cu/AgZr films (multilayer) since they present a possible development by the growth techniques recently acquired by the laboratory (in particular PVD and CVD techniques). Finally, this study also showed the potential of the ab inition method for the design of new materials by combining the effects of temperature, concentration, defects. Etc. Knowing the tendencies and the correlation between the microscopic and macroscopic properties, the designer can be well guided for the development of new alloys with the required properties without making expensive experiments
Bessoud, Agnès. "Analyse des interactions dans des alliages à base de métaux de transition." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0091.
Ravach, Gwennola. "Etude structurale, magnétique et thermique de rubans amorphes Fe-Tr-B (Tr, Nd, Ho, Dy) à anisotropie magnétique aléatoire." Rouen, 1997. http://www.theses.fr/1997ROUES056.
FOY, EDDY. "Croissance, structure et magnétisme de couches minces à base de métaux de transition : cas de Mn/Fe(100) et des alliages cfc FeNi1-x/Cu(100) de type Invar." Châtenay-Malabry, Ecole centrale de Paris, 1999. http://www.theses.fr/1999ECAP0637.
De, Pauw Virginie. "Mécanismes de nitruration et d'oxydation du composé intermétallique Sm2 (Fe, Co)1#7 pour aimants permanents." Rouen, 1996. http://www.theses.fr/1996ROUES053.
Tete, Claude. "Contribution à l'étude de l'évolution thermique des propriétés structurales et magnétiques des alliages FE-P-C amorphes." Nancy 1, 1987. http://www.theses.fr/1987NAN10110.
Lemoine, Charlotte. "Etude structurale et magnétique de mélanges FeCr élaborés par mécanosynthèse." Rouen, 2000. http://www.theses.fr/2000ROUES039.
Javidani, Mousa. "Effect of Cu, Mg and Fe on solidification processing and microstructure evolution of Al-7Si based foundry alloys." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26146.
Over the past decade, Al-Si based foundry alloys have increasingly been used as a suitable alternative for cast iron in the fabrication of engine components. This project was aimed to study the effect of Cu, Mg and Fe elements on solidification defects (hot rearing tendency and microporosity), and on evolution of post eutectic phases in the Al-7Si (wt.-%) based alloys. Initially, the previous works and the most pertinent literatures were thoroughly reviewed to elaborate the thermo-mechanical fatigue loads, characteristics, requirements and materials applicable in engine components (mainly cylinder-head). Subsequently, the solidification defects of the Al-Si based alloys were evaluated. By increasing Cu and Fe content of the alloys, the hot tearing sensitivity and the microporosity content of the alloys were both enhanced. Multiphase back diffusion model was utilized to simulate the theoretical hot tearing indices. A very good correlation was obtained between the experimental and the theoretical hot tearing indices. Effect of the chemistry (Cu, Mg and Fe content) on microstructure evolution of the Al-Si foundry alloys was consequently studied. As-cast and solution heat treated (SHT) microstructures of the alloys were evaluated by optical- and electron-microscopy. Two etchants were developed to discriminate the Mg-bearing intermetallics (Q-Al5Cu2Mg8Si6, π- Al8FeMg3Si6) under optical microscope. Differential scanning calorimetry (DSC) was utilized to examine the phase transformations occurring during heating/cooling process. Thermodynamic computations were carried out to assess the phase formation in the equilibrium/non-equilibrium conditions. According to the predicted/experimental results, the solidification sequence and the stability of Cu/Mg bearing intermetallics are strongly influenced by the chemistry of the alloys. Q-Al5Cu2Mg8Si6 phase was solidified either at the same temperature or earlier than θ-Al2Cu phase depending the Cu content of the alloy. Moreover, Q-Al5Cu2Mg8Si6 and π- Al8FeMg3Si6 which were soluble at 505℃ in the alloy Al-7Si-1.5Cu-0.4Mg, remained almost intact in the alloy Al-7Si-1.5Cu-0.8Mg wt.-%. Tough the AlCuFe- intermetallic was barely observed in the as-cast microstructure, the reaction of α-Al with the β-Al5FeSi phase caused the formation of the N-Al7Cu2Fe phase during SHT. The solid state phase transformation (precipitation temperature and mechanism) of β-Al5FeSi to the N-Al7Cu2Fe phase was also investigated.
Abdellaoui, Mohieddine. "Transitions de phases sous chocs mécaniques : mécanosynthèse du système magnétque Fe-Si." Paris 6, 1994. http://www.theses.fr/1994PA066294.
Ben, Mbarek Wael. "Synthèse, caractérisation et application des alliages à base de Mn-X-Y (X=Al; Y=Fe,Co) et Ca-Al dans la dégradation d'un colorant azoïque "Black 5" utilisé dans l'industrie de textile." Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/666563.
Aquest treball s'enmarca en el context general de la síntesi i caracterització d'aliatges de base Mn o Ca que són utilitzats en processos de degradació de colorants azo habitualment emprats en les indústries tèxtils. Els aliatges han estat produïts essencialment per tres tècniques: fusió per arc (arc melting), refredament ràpid en una roda giratòria (melt spinning) per a la producció de cintes i mòlta mecànica (ball milling) per a la producció de pols. El baix valor de l'energia d'activació i la ràpida cinètica de degradació fa que els aliatges del sistema Mn-Al siguin candidats a ser utilitzats en el tractament de decoloració d'aïgues residuals industrials. S'ha analitzat l'addició de Fe o Co. La baixa resistència a la corrosió del Fe augmenta la velocitat de la reacció de degradació. Per altra banda, els resultats obtinguts en el sistema Ca-Al mostren que són agents reductors efectius en condicions de pH neutre
Benabed, Mohamed Salim. "Élaboration de revêtements à base de titane en milieu igné." Paris 6, 1986. http://www.theses.fr/1986PA066373.
Hadjadj, Lakhdar. "Etude à la sonde atomique d'alliages à base titane." Rouen, 1988. http://www.theses.fr/1988ROUES014.
Daro, Nathalie. "Polymères de Fe(II) à transition de spin à base de triazole : synthèse, étude des propriétés et nouvelles potentialités." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14994.
Spin crossover polymers based on Fe(II) and 1,2,4-triazole ligands [Fe(Rtrz)3]X2 have switching capabilities near room temperature. Optical and magnetic bistabilities observed for these systems confer potential applications. It is well established that their properties are highly dependent on their composition : the nature of the 1,2,4-triazole substituent, the anion and the rate of hydration. Our work has addressed several different topics. The influence of the dehydration/rehydration phenomenon on the spin transition is first studied for some complexes. Next, molecular alloy method is considered to obtain new materials. Then, the influence of synthesis parameters on the properties is examined for four selected compounds. Finally, the effect of treatment in a supercritical medium on the molecular characteristics of these compounds is studied
Hug, Eric. "Etude des dégradations des propriétés magnétiques d'alliages Fe-3% Si avec les déformations plastiques : Application à la mise en oeuvre des tôles utilisées dans la conception des moteurs électriques." Compiègne, 1993. http://www.theses.fr/1993COMP632S.
Rivoirard, Sophie. "Poudres Nd-Fe-B anisotropes et coercitives pour aimants liés, préparées par forgeage à chaud et décrépitation à l'hydrogène." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10207.
VERMOYAL, JEAN-JEROME. "Contribution a l'identification des processus cinetiquement limitants de l'oxydation des alliages de zirconium caracterisation en electrochimie des solides des films d'oxyde formes a haute temperature." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10077.
Costa, Davide. "Modelling the thermal ageing evolution of Fe-Cr alloys using a lattice kinetic Monte Carlo approach based on DFT calculations." Electronic Thesis or Diss., Lille 1, 2012. http://www.theses.fr/2012LIL10037.
In this thesis, we address the study of the microstrucutre evolution of the Fe-Cr system under thermal ageing. The vacancy diffusion mechanism was investigated in the framework of the density functional theory (DFT) and the capability of a recently developed embedded atom method (EAM) empirical cohesive model to reproduce the DFT results was examined. We have shown that the vacancy migration energy strongly depends on the saddle point atomic environment where the chromium-chromium and the chromium-vacancy interactions partially determine the saddle point energy. We proposed three approaches for the parameterisation of an atomistic kinetic Monte Carlo (AKMC) model: one fully based on the EAM potential, the others partially based on our DFT calculations. The AKMC simulations of the thermal ageing of the Fe-20 at.%Cr and Fe-25 at.%Cr alloys at 773 K show the formation of chromium-rich precipitates whose growth with time follows a power law with exponent 1/3. This is consistent with the Lifshitz-Slyozov-Wagner theory of coarsening. The AKMC parameterisation fully based on the EAM potential predicts a mean precipitate size higher than the experimentally observed one, whereas the parameterisations partially based on our DFT calculations underestimate it. This disagreement seems to have a kinetic rather than thermodynamic origin. The composition of the precipitating phase varies during the phase separation thus indicating that the unmixing is driven by either a non-classical nucleation or a spinodal decomposition. Interconnected precipitates are more likely to form in the Fe-25 at.%Cr alloy than in the Fe-20 at.%Cr thus suggesting that, as the solute concentration increases, the spinodal decomposition is more likely to occur
Simonetta-Perrot, Marie-Thérèse. "Étude de l'influence d'éléments traces (C, S, B, Al, N) sur la ductilité à chaud de l'alliage austenitique Fe-Ni 36% (INVAR) de haute pureté." Grenoble INPG, 1994. http://www.theses.fr/1994INPG4209.
Dabou, Oussama. "Etude de la microstructure, de la texture et des propriétés magnétiques d'un alliage à base de Ni et de Fe après traitement par déformation plastique sévère et recuit." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF020.
This thesis provides a comprehensive study of the Mumetal alloy, delving into its microstructure, texture, hardness, magnetic properties, and their interrelations. It covers two major aspects. The first part examines the microstructural and mechanical changes induced by severe plastic deformation (SPD) techniques such as Accumulative Roll Bonding (ARB), High-Pressure Torsion (HPT), and Constrained Groove Pressing (CGP). ARB transforms the Mumetal's microstructure from equiaxed grains to elongated grains. Dislocation gradients, texture changes, and a significant improvement in hardness contribute to the material's superior mechanical properties. HPT generates even finer grain structures and increased hardness. CGP demonstrates how in-situ deformation under temperature can enhance Mumetal's mechanical properties without altering the material's grain size. The second part explores the magnetic properties of Mumetal and their correlation with microstructural and mechanical parameters. It reveals that microstructural refinement significantly impacts Mumetal's magnetic characteristics. Magnetic properties are closely linked to the microstructural evolution resulting from SPD techniques. Magnetic measurements highlight the relationship between Mumetal's magnetic softness and its mechanical hardness, holding implications for its use in electromagnetic shielding and other technologies. Moreover, thermomechanical treatment can achieve a synergistic balance between magnetic softness and mechanical hardness. By optimizing microstructural features, these materials can be tailored for specific applications
Costa, Davide. "Modelling the thermal ageing evolution of Fe-Cr alloys using a lattice kinetic Monte Carlo approach based on DFT calculations." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10037/document.
In this thesis, we address the study of the microstrucutre evolution of the Fe-Cr system under thermal ageing. The vacancy diffusion mechanism was investigated in the framework of the density functional theory (DFT) and the capability of a recently developed embedded atom method (EAM) empirical cohesive model to reproduce the DFT results was examined. We have shown that the vacancy migration energy strongly depends on the saddle point atomic environment where the chromium-chromium and the chromium-vacancy interactions partially determine the saddle point energy. We proposed three approaches for the parameterisation of an atomistic kinetic Monte Carlo (AKMC) model: one fully based on the EAM potential, the others partially based on our DFT calculations. The AKMC simulations of the thermal ageing of the Fe-20 at.%Cr and Fe-25 at.%Cr alloys at 773 K show the formation of chromium-rich precipitates whose growth with time follows a power law with exponent 1/3. This is consistent with the Lifshitz-Slyozov-Wagner theory of coarsening. The AKMC parameterisation fully based on the EAM potential predicts a mean precipitate size higher than the experimentally observed one, whereas the parameterisations partially based on our DFT calculations underestimate it. This disagreement seems to have a kinetic rather than thermodynamic origin. The composition of the precipitating phase varies during the phase separation thus indicating that the unmixing is driven by either a non-classical nucleation or a spinodal decomposition. Interconnected precipitates are more likely to form in the Fe-25 at.%Cr alloy than in the Fe-20 at.%Cr thus suggesting that, as the solute concentration increases, the spinodal decomposition is more likely to occur
Cartier, Mathilde. "Vannes de spin et jonctions tunnel à base d'oxyde de nickel : les briques élémentaires d'un transistor magnétique." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10135.
Dobler, Stéphane. "Solidification biphasée des alliages péritectiques Fe-Ni /." [S.l.] : [s.n.], 2001. http://library.epfl.ch/theses/?nr=2409.
Steyaert, Sabine. "Corrosion de poudres Nd-Fe-B et Nd-Fe-B/Fe : analyse structurale ; cinétique d'oxydation de la phase Nd 2Fe 1 4B." Rouen, 1998. http://www.theses.fr/1998ROUES070.
Rouve, Laure-Line. "Prise en compte du comportement magnétique fréquentiel des tôles FeSi en modélisation électrotechnique." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0027.
Kernavanois, Nolwenn. "Blocage du moment orbital et hybridation des électrons f : étude par absorption et diffusion de rayons-X et diffraction de neutrons de composés à base d'uranium et de cérium." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10114.
Cataldo, Laurent. "Contribution à l'élaboration et à l'optimisation d'alliages magnétiques permanents Sm-Co-Cu-Fe-Zr." Lyon 1, 1996. http://www.theses.fr/1996LYO10206.
Ellouze, Mohamed. "Synthèse et effet de la substitution limitée et de l'insertion d'atomes (H,C et N) sur les caractéristiques cristallographiques et magnétiques des composés R2Fe17." Grenoble INPG, 1998. http://www.theses.fr/1998INPG0166.
Lelievre, Gwenn. "Etude du rôle des précipités intermétalliques dans l'absorption d'hydrogène lors de la corrosion aqueuse d'alliages de zirconium." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10174.
Gannac, Yves. "Alliages Fe-6,5%Si élaborés par solidification rapide sous atmosphère controlée : microstructure, propriétés magnétiques et comparaison avec des alliages Fe-Si industriels." Toulouse, INSA, 1992. http://www.theses.fr/1992ISAT0015.
Dumay, Christophe. "Étude de l'affinage oxydant du silicium métallurgique et des ferrosiliciums." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0117.
David, Nicolas. "Modélisation thermodynamique du système (Al, Cu, Fe, In, Pb, Sn, Zn)." Nancy 1, 2001. http://www.theses.fr/2001NAN10120.
Sun, Fan. "Alliages nanostructurés : à base d'aluminium et des beta-métastables à base de titane." Rennes, INSA, 2009. http://www.theses.fr/2009ISAR0013.
In this work thermal analyses were carried out on the Al88Ni6Sm6 amorphous alloy of and metastable beta Ti-Mo alloys. By means of DSC, electrical resistivity and dilatometry, the nanophase transformation mechanisms and the kinetics growth in both alloys were investigated under isothermal and non-isothermal condition. On the Ti-based alloys, thermo-mechanical treatments were carried out in order to enhance the tensile strength by controlling the dispersion of the alpha nanoprecipitates through the beta matrix. Tensile test results indicated a very high strengthening effect, which is particularly huge with the Ti-12Mo alloy where a tensile strength as high as around 1600MPa was obtained after a two-step annealing treatment. This highly enhanced tensile strength was attributed to the complex intragranular nanostructure observed by transmission electron microscopy, consisting of two-scale alpha nanoprecipitates inside sub-micrometer beta grains
Abdul-Latif, Akrum. "Approches multi-échelles pour la description de l'anélasticité avec endommagement." Compiègne, 1994. http://www.theses.fr/1994COMP678S.
STEPHAN, MAURICE. "Solidification rapide d'alliages a base fer et a base zinc. Application a l'amelioration du rendement d'un inducteur." Le Mans, 1994. http://www.theses.fr/1994LEMA1021.
Poollay, Mootien Sattyvel. "Fluage des alliages à base d'aluminium-lithium." Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22011.
Ajao, John. "Borures dans quelques alliages à base nickel." Grenoble INPG, 1988. http://www.theses.fr/1988INPG0025.
Ajao, John. "Borures dans quelques alliages à base nickel." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37611105t.
Magnin, Pierre. "Solidification compétitive stable/métastable des alliages FE-C-X eutectiques /." [S.l.] : [s.n.], 1985. http://library.epfl.ch/theses/?nr=560.
Zuazo, Rodriguez Ian Alberto. "Evolution microstructurale dans les alliages légers Fe-Al-Mn-C." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0054.
In this work emphasis is put on the clarification of the complex microstructural evolution in multiphase lightweight steels. In the first part of this investigation detailed sequences of phase transformations are proposed and the domains where austenite is stable are given. Then isothermal growth kinetics of austenite was measured. Kinetics was modeled with known binary and ternary models. The DICTRA software provided only a qualitative description due to the shortcomings of the thermodynamic database. A deep-etching procedure together with the EBSD technique provided a correlation between morphology of the K-phase and orientation relationships with ferrite. Isothermal growth kinetics was measured in two morphologies of the K-phase. Modeling of the K-phase required a better knowledge of phase equilibria to yield proper results
Martinez, Celis Mayerling Viguier Bernard. "Transformation de phases et comportement à l'oxydation d'alliages Fe-Al." Toulouse : INP Toulouse, 2008. http://ethesis.inp-toulouse.fr/archive/00000504.
Atli, Halil Atilla. "Réactivité de surfaces d'alliages monocristallins Pt-Ni et Pt-Fe vis-à-vis de l'hydrogène." Lyon 1, 1992. http://www.theses.fr/1992LYO10104.
Ould, Mohamed Lemine Mohamed Abdellahi. "Propriétés structurales et magnétiques des superréseaux Fe/Ir(100)." Nancy 1, 1999. http://www.theses.fr/1999NAN10128.
April-Borgeat, Julien. "Étude du comportement des bifilms lors de solidifications contrôlées d'alliages d'Al-Fe et d'Al-Fe-Si avec et sans centrifugation." Master's thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/69042.
Bifilms are solid inclusions, present in large numbers in aluminum and are detrimental to the mechanical properties of alloys. It has been observed that upon solidification approaching equilibrium, the intermetallic Al3Fe and Al5FeSi-B can only nucleate on the oxide films present. Having a much higher density than liquid aluminum, these intermetallic particles start sedimentation as soon as they are formed and therefore carry with them the bifilms on which they have nucleated. The main objective of this project is the study of the behavior of bifilms in iron-enriched aluminum alloys during slow solidifications approaching equilibrium. An Al-3.74%Fe alloy which nucleates Al3Fe and another Al-1.16%Fe-12.6%Si alloy which nucleates Al5FeSi-B were cast into bars. An apparatus capable of centrifuging the bars was used to generate a G force greater than the Earth's gravitational acceleration during solidification. Some bars were centrifuged during solidification, others were not. All the bars were cut perpendicular to the axis, separating the different areas of particle accumulation from the areas of metal without accumulated particles. The XRF elemental mapping results allow us to confirm that intermetallic sedimentation occurs for each alloy, creating a zone of particle accumulation at the bottom of the samples. A technique has been developed to quantify and locate the bifilms in these areas; the Modified Reduced Pressure Test - MRPT. This test reveals bifilms by swelling them during re-fusion under controlled pressure. Once solidified, the samples were cut and polished, the pores were counted, and the metal surface measured to calculate the number of pores/cm2 of metal. The results of TPRM allow us to say that the intermetallic also carried the bifilms with them. The bifilm-cleaned areas show a reduction in their number of pores/cm2 of up to 53 % for the Al-Fe alloy and 63 % for the Al-Fe-Si alloy in comparison to the value of their respective reference sample. This reduction reaches a minimum of 40 % in all samples cleaned of their bifilms, whether they were centrifuged or not.