Download or read book Contribution la mod lisation de la corrosion microstructurale des alliages d aluminium written by Nicolas Murer and published by . This book was released on 2008 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'amorçage et la propagation de la corrosion microstructurale des alliages d’aluminium repose la plupart du temps sur le phénomène de corrosion bimétallique. Cette corrosion est due à l’établissement d’un couplage galvanique à l’échelle locale entre les différentes phases contenues dans l’alliage. La complexité des phénomènes de corrosion locale explique la difficulté de leur prédiction par les outils numériques. Le présent travail de thèse apporte une contribution nouvelle dans ce sujet en proposant de modéliser ce couplage grâce une méthodologie basée sur la complémentarité entre des techniques électrochimiques locales et la simulation de la corrosion bimétallique par éléments finis. D'un point de vue expérimental, la microcellule électrochimique à capillaire a été utilisée pour acquérir des données cinétiques électrochimiques relatives à un système bimétallique modèle millimétrique, composé d’une électrode de 1199 et d’une électrode de solution solide Al4%Cu. Ces données cinétiques ont été ensuite utilisées comme conditions aux limites pour la modélisation du couplage. Des essais S.V.E.T. (Scanning Vibrating Electrode Technique) permettent de valider les distributions de courant obtenues numériquement. L’utilisation d’un système modèle a permis de faire varier différents paramètres de simulation, en particulier la façon de prendre en compte l’influence du pH sur l’intensité de la dissolution de la phase la plus anodique. Les conditions les plus satisfaisantes ont été appliquées à un système plus réaliste composé d’une particule intermétallique dite cathodique et couplée à la matrice de l'alliage d'aluminium concerné qui représente l'anode.
Download or read book Etude et contr le de la corrosion feuilletante des alliages d aluminium 2024 et 7449 par bruit lectrochimique et mission acoustique written by Fabien Bellenger and published by . This book was released on 2002 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail concerne l'étude et la caractérisation de la corrosion feuilletante de divers alliages d'aluminium laminés (2024 et 7449) et la réalisation d'un outil de détection et de suivi de ce mode de dégradation sur structures en service. L'endommagement est caractérisé par la technique d'émission acoustique et de diverses méthodes électrochimiques, en particulier la spectroscopie d'impédance et la mesure du bruit électrochimique. Les résultats sont discutés et analysés en liaison avec la microstructure étudiée par microscopie électronique (MEB et MET). L'analyse des densités spectrales des signaux acoustiques permet de détecter, suivre et caractériser le développement de la corrosion feuilletante. Trois étapes successives sont observées sur chacun des matériaux testés. L'alliage 2024 T3 subit une dégradation pour laquelle l'effet des contraintes liées aux produits de corrosion, est déterminant. Par contre, l'alliage 7449 T76 se dégrade essentiellement par dissolution électrochimique intergranulaire. Le comportement de l'alliage 7449 T6 est intermédiaire entre les deux précédents. Les résultats obtenus par électrochimie, confirment et complètent ceux obtenus par émission acoustique. Les différences de comportement des trois matériaux étudiés résultent de la compétition plus ou moins importante entre la dissolution électrochimique et l'apparition de contraintes dues aux produits de corrosion. Ces différences s'interprètent en prenant en compte les caractéristiques microstructurales particulières à chacun des matériaux (discontinuité et taille des précipités, importance des couplages galvaniques entre phases, influence des contraintes locales).
Download or read book M canismes de corrosion localis e de l alliage d aluminium 2024 written by Loïc Lacroix and published by . This book was released on 2008 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'alliage 2024 (Al-Cu-Mg) est, dans le contexte de l'allègement de structure, encore largement utilisé par l'industrie aéronautique. Sa microstructure le rend sensible à la corrosion localisée (corrosion par piqûres, corrosion feuilletante et intergranulaire). Parmi les paramètres microstructuraux, les particules intermétalliques, et notamment les particules de phase S-Al2CuMg, sont dans de nombreux cas un facteur d'endommagement. Ce travail de thèse est donc centré sur leur réactivité ainsi que sur l'apport de techniques locales à cette étude. Dans ce travail, une étude multianalytique a été réalisée. La microscopie à force atomique (AFM pour Atomic Force Microscopy) couplée au mode Kelvin (KFM pour Kelvin Force Microscopy) permettent l'acquisition de la topographie et du potentiel de surface d'un échantillon à l'échelle nanométrique. Le couplage de ces techniques à des analyses chimiques d'extrême surface par SIMS (Secondary Ions Mass Spectroscopy) ainsi que le suivi de la composition des particules lors de leur dissolution (MEB-EDS) ont démontré que l'association AFM-KFM permet le suivi de l'ensemble des phénomènes de dissolution de particules intermétalliques riches en cuivre avec une résolution spatiale de l'ordre de la centaine de nanomètres. En parallèle à ces travaux, l'étude d'alliages et de systèmes modèles par des techniques électrochimiques stationnaires et transitoires telles que la Spectroscopie d'Impédance Electrochimique Locale (SIEL) a été réalisée. Ce travail a permis de montrer la représentativité de ces systèmes pour étudier les phénomènes de microcouplage galvanique entre particules intermétalliques et matrice de l'alliage commercial 2024. La réactivité du couple aluminium/magnésium a été simulée numériquement par la méthode des éléments finis. Les distributions de courant et de potentiel calculées ont été validées par des observations en microscopie optique et électronique.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1989 with total page 1182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Design and Manufacturing for Lightweight Vehicles written by P.K. Mallick and published by Elsevier. This book was released on 2010-03-01 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research into the manufacture of lightweight automobiles is driven by the need to reduce fuel consumption to preserve dwindling hydrocarbon resources without compromising other attributes such as safety, performance, recyclability and cost. Materials, design and manufacturing for lightweight vehicles will make it easier for engineers to not only learn about the materials being considered for lightweight automobiles, but also to compare their characteristics and properties.Part one discusses materials for lightweight automotive structures with chapters on advanced steels for lightweight automotive structures, aluminium alloys, magnesium alloys for lightweight powertrains and automotive structures, thermoplastics and thermoplastic matrix composites and thermoset matrix composites for lightweight automotive structures. Part two reviews manufacturing and design of lightweight automotive structures covering topics such as manufacturing processes for light alloys, joining for lightweight vehicles, recycling and lifecycle issues and crashworthiness design for lightweight vehicles.With its distinguished editor and renowned team of contributors, Materials, design and manufacturing for lightweight vehicles is a standard reference for practicing engineers involved in the design and material selection for motor vehicle bodies and components as well as material scientists, environmental scientists, policy makers, car companies and automotive component manufacturers. - Provides a comprehensive analysis of the materials being used for the manufacture of lightweight vehicles whilst comparing characteristics and properties - Examines crashworthiness design issues for lightweight vehicles and further emphasises the development of lightweight vehicles without compromising safety considerations and performance - Explores the manufacturing process for light alloys including metal forming processes for automotive applications
Download or read book Advanced Light Alloys and Composites written by R. Ciach and published by Springer Science & Business Media. This book was released on 1998-09-30 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: An expert exposition of the structural and mechanical properties of light alloys and composites, bridging the gap between scientists and industrial engineers in its consideration of advanced light materials, their structure, properties, technology and application. Includes basic problems of alloy constitution and phase transformations. The aluminium alloys are the main topic of the book, consideration being given to their properties, casting technology, thermomechanical treatment and structure. Attention is also given to the magnesium alloys, particularly those having rare earth metal constituents. Both commercial titanium alloys and intermetallic compounds are discussed, as are metallic composites. The latest engineering techniques are discussed in both theoretical and practical terms.
Download or read book Duplex Stainless Steels written by Iris Alvarez-Armas and published by John Wiley & Sons. This book was released on 2013-01-16 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Duplex Stainless Steels (DSSs) are chromium-nickel-molybdenum-iron alloys that are usually in proportions optimized for equalizing the volume fractions of austenite and ferrite. Due to their ferritic-austenitic microstructure, they possess a higher mechanical strength and a better corrosion resistance than standard austenitic steels. This type of steel is now increasing its application and market field due to its very good properties and relatively low cost. This book is a review of the most recent progress achieved in the last 10 years on microstructure, corrosion resistance and mechanical strength properties, as well as applications, due to the development of new grades. Special attention will be given to fatigue and fracture behavior and to proposed models to account for mechanical behavior. Each subject will be developed in chapters written by experts recognized around the international industrial and scientific communities. The use of duplex stainless steels has grown rapidly in the last 10 years, particularly in the oil and gas industry, chemical tankers, pulp and paper as well as the chemical industry. In all these examples, topics like welding, corrosion resistance and mechanical strength properties (mainly in the fatigue domain) are crucial. Therefore, the update of welding and corrosion properties and the introduction of topics like texture effects, fatigue and fracture strength properties, and mechanical behavior modeling give this book specific focus and character.
Download or read book Light Metal Alloys Applications written by Waldemar Alfredo Monteiro and published by BoD – Books on Demand. This book was released on 2014-06-11 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lightweight alloys have become of great importance in engineering for construction of transportation equipment. At present, the metals that serve as the base of the principal light alloys are aluminum and magnesium. One of the most important lightweight alloys are the aluminum alloys in use for several applications (structural components wrought aluminum alloys, parts and plates). However, some casting parts that have low cost of production play important role in aircraft parts. Magnesium and its alloys are among the lightest of all metals and the sixth most abundant metal on earth. Magnesium is ductile and the most machinable of all metals. Many of these light weight alloys have appropriately high strength to warrant their use for structural purposes, and as a result of their use, the total weight of transportation equipment has been considerably decreased.
Download or read book Complex Inorganic Solids written by Patrice E. A. Turchi and published by Springer Science & Business Media. This book was released on 2007-12-31 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the key aspects of this volume is to cut across the traditional taxonomy of disciplines in the study of alloys. Hence there has been a deliberate attempt to integrate the different approaches taken towards alloys as a class of materials in different fields, ranging from geology to metallurgical engineering. The emphasis of this book is to highlight commonalities between different fields with respect to how alloys are studied. The topics in this book fall into several themes, which suggest a number of different classification schemes. We have chosen a scheme that classifies the papers in the volume into the categories Microstructural Considerations, Ordering, Kinetics and Diffusion, Magnetic Considerations and Elastic Considerations. The book has juxtaposed apparently disparate approaches to similar physical processes, in the hope of revealing a more dynamic character of the processes under consideration. This monograph will invigorate new kinds of discussion and reveal challenges and new avenues to the description and prediction of properties of materials in the solid state and the conditions that produce them.
Download or read book Modelling Aqueous Corrosion written by Kenneth R. Threthewey and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: All significant studies agree that aqueous corrosion continues to cost nations dearly in almost every area of technological endeavour. Over the past ten years, microcomputers have facilitated an explosion in the power of modelling as a technique in science and engineering. In corrosion they have enabled better understanding of polarization curves, they have transformed the scope of electrochemical impedance measurements and they have placed a large range of electrochemistry at the fingertips of the corrosion scientist. This book focuses on the models, rather than the computing, which have been made possible during the past decade. Aimed at all those with an interest in corrosion and its control, the book draws together the range of new modelling strands, suggests new avenues of approach and generates further momentum for improvements to corrosion management, whether by increased understanding of atomistic processes or by control of large plant.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Download or read book Bearing Steels written by J. J. C. Hoo and published by ASTM International. This book was released on 1975 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aws D1 2 d1 2m written by and published by . This book was released on 2014-06-12 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Corrosion of Titanium written by J. D. Jackson and published by . This book was released on 1966 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bearing Steel Technology written by John M. Beswick and published by ASTM International. This book was released on 2007 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress corrosion Cracking written by Russell H. Jones and published by ASM International(OH). This book was released on 1992 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: Details the many conditions under which stress-corrosion cracking (SCC) can occur, the parameters which control SCC, and the methodologies for mitigating and testing for SCC, plus information on mechanisms of SCC with experimental data on a variety of materials. Contains information about environmen
Download or read book Fundamentals Of Materials Modelling For Metals Processing Technologies Theories And Applications written by Jianguo Lin and published by World Scientific Publishing Company. This book was released on 2015-03-24 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive introduction to the unique theory developed over years of research on materials and process modelling and its application in metal forming technologies. It starts with the introduction of fundamental theories on the mechanics of materials, computational mechanics and the formulation of unified constitutive equations. Particular attention is paid to elastic-plastic formulations for cold metal forming and unified elastic-viscoplastic constitutive equations for warm/hot metals processing. Damage in metal forming and numerical techniques to solve and determine the unified constitutive equations are also detailed. Examples are given for the application of the unified theories to solve practical problems encountered in metal forming processes. This is particularly useful to predict microstructure evolution in warm/hot metal forming processes. Crystal plasticity theories and modelling techniques with their applications in micro-forming are also introduced in the book.The book is self-contained and unified in presentation. The explanations are highlighted to capture the interest of curious readers and complete enough to provide the necessary background material to further explore/develop new theories and applications.
