Download or read book Int raction dislocations de matrice joints de grains dans le fer written by Omar Khalfallah and published by . This book was released on 1988 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: ANALYSE THEORIQUE PAR LE CALCUL DE LA FORCE IMAGE ET EXPERIMENTALE PAR MICROSCOPIE ELECTRONIQUE EN TRANSMISSION DE L'INTERACTION D'UNE DISLOCATION AVEC UN JOINT DE GRAINS. CALCUL SUR LA BASE DE L'ELASTICITE ANISOTROPE DE L'ENERGIE DONT DERIVE LA FORCE IMAGE POUR DIFFERENTES SITUATIONS CRISTALLOGRAPHIQUES. LES FAIBLES INTERACTIONS SONT ASSOCIEES AUX CONFIGURATIONS DE HAUTE SYMETRIE. LA FORCE IMAGE PEUT AGIR SUR UNE DISLOCATION JUSQU'A UNE DISTANCE DE L'ORDRE DE 100NM. LES SITUATIONS DE NON INCORPORATION DE LA DISLOCATION DE MATRICE AU JOINT S'EXPLIQUENT PAR L'INTERVENTION DES PARAMETRES CRISTALLOGRAPHIQUES.

Download or read book INFLUENCE DU PHOSPHORE SUR LA TEXTURE DES JOINTS DE GRAINS ET SUR L INTERACTION DISLOCATIONS JOINTS DE GRAINS DANS LE FER written by BENYOUNES.. ELM'RABAT and published by . This book was released on 1986 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: ANALYSE PAR MICROSCOPIE ELECTRONIQUE EN TRANSMISSION DES EFFETS DU PHOSPHORE SUR LES JOINTS DE GRAINS DU FER POUR TENTER D'INTERPRETER LA FRAGILISATION DU FER PAR LE PHOSPHORE EN TERMES DE FORMATION ET DE RELAXATION DES DISLOCATIONS INTRINSEQUES. LE PHOSPHORE ENTRAINE UNE AUGMENTATION DU POURCENTAGE DES JOINTS. IL SEMBLE FAVORISER LA DEFORMATION A FROID DES JOINTS DANS LESQUELS UN GRAND NOMBRE DE DISLOCATIONS S'INCORPORENT AISEMENT. LA TEMPERATURE DE "DISPERSION" OU "DISLOCATION" DES DISLOCATIONS VARIE SELON LE TYPE DU JOINT ET SELON LES CARACTERISTIQUES DE LA DISLOCATION. ANALYSE DE L'INTERACTION "DISLOCATIONS-JOINTS DE GRAINS" PAR ETUDE DE LA DEFORMATION IN SITU DES JOINTS

Download or read book Crystal Plasticity Finite Element Methods written by Franz Roters and published by John Wiley & Sons. This book was released on 2011-08-04 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the leading experts in computational materials science, this handy reference concisely reviews the most important aspects of plasticity modeling: constitutive laws, phase transformations, texture methods, continuum approaches and damage mechanisms. As a result, it provides the knowledge needed to avoid failures in critical systems udner mechanical load. With its various application examples to micro- and macrostructure mechanics, this is an invaluable resource for mechanical engineers as well as for researchers wanting to improve on this method and extend its outreach.

Download or read book Etude des interactions entre dislocations et joints de grains dans le cuivre written by Jean-Philippe Couzinie and published by . This book was released on 2004 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJECTIF FONDAMENTAL DE CETTE THESE EST L’ANALYSE PAR MICROSCOPIE ELECTRONIQUE EN TRANSMISSION DES MECANISMES D’ACCOMMODATION DES DISLOCATIONS DE MATRICE DISSOCIEES DANS LES JOINTS DE GRAINS DU CUIVRE, ETUDE PRIMORDIALE POUR COMPRENDRE LE COMPORTEMENT MECANIQUE DES MATERIAUX CRISTALLINS.DANS LES JOINTS DE BASSE ENERGIE S3 {111}, DEUX RESULTATS IMPORTANTS SONT OBTENUS: SI LE PLAN DE L’INTERFACE EST UN PLAN DE GLISSEMENT POUR LA DISLOCATION INCIDENTE, UNE INCORPORATION PAR RECOMBINAISON DES DISLOCATIONS PARTIELLES DE SHOCKLEY EST MISE EN EVIDENCE. EN CAS CONTRAIRE, L’HYPOTHESE LA PLUS PROBABLE CONSIDERE L’ENTREE PUIS LA DECOMPOSITION DE LA DISLOCATION PARTIELLE DE TETE EN UNE DISLOCATION GLISSILE DU RESEAU DE JOINT ET UNE DISLOCATION SESSILE DE TYPE STAIR-ROD, PROCESSUS SUIVIS DE L’ENTREE DE LA SECONDE PARTIELLE.DANS UN JOINT DE HAUTE ENERGIE S9 {221}, L’EVOLUTION RAPIDE DE L’ACCOMMODATION A TEMPERATURE AMBIANTE DES PRODUITS DE DECOMPOSITION D’UNE DISLOCATION EXTRINSEQUE DANS LE RESEAU INTRINSEQUE TEMOIGNE D’UNE FORTE DIFFUSIVITE DU JOINT A BASSE TEMPERATURE. PAR AILLEURS, LA STRUCTURE DES JOINTS S9, OBSERVEE PAR MICROSCOPIE ELECTRONIQUE A HAUTE RESOLUTION, SE COMPOSE DE FACETTES SYMETRIQUES ET ASYMETRIQUES. LE COUPLAGE OBSERVATIONS-SIMULATIONS ATOMIQUES MONTRE QUE LES PARTIES ASYMETRIQUES SE DECRIVENT PAR LE MODELE DES UNITES STRUCTURALES ET QU’ELLES SONT DE PLUS BASSE ENERGIE QUE LES PARTIES SYMETRIQUES.ENFIN, POUR UN JOINT GENERAL, UN ESSAI PAR DEFORMATION IN-SITU REVELE L’ACCOMMODATION SPONTANEE DE DISLOCATIONS DES LEUR ENTREE DANS LE JOINT. CE DERNIER SEMBLE SE COMPORTER COMME UNE COUCHE QUASI-VISQUEUSE, LA DISLOCATION EXTRINSEQUE COMME UNE DENSITE DE DEFORMATION.

Download or read book Les joints de grains written by Louisette Priester and published by EDP Sciences. This book was released on 2012-12-03T00:00:00+01:00 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les joints de grains sont des éléments majeurs constitutifs des matériaux cristallins. Ils jouent un rôle important dans les propriétés de ces matériaux d'autant plus que la taille des grains diminue et/ou que des procédés d'élaboration et de transformation se développent permettant de jouer sur la diversité de ces éléments dans un polycristal. Cet ouvrage présente les connaissances de base sur les joints de grains et ouvre la voie à des orientations de recherche diversifiées dans ce domaine. Le recours à des approches mathématiques est volontairement limité. Les exemples sont privilégiés, les questions qu'ils soulèvent sont discutées par référence aux théories. La démarche générale est sous-tendue par deux objectifs étroitement associés : - conduire le lecteur du joint « idéal » au joint « réel » dans les matériaux d'emploi ; - partir des connaissances établies pour aborder les perspectives qui se dessinent dans la voie d'une « Ingénierie des joints de grains ». Par ce concept, on vise la maîtrise des textures morphologiques et cristallographiques qui conditionnent les propriétés des matériaux. Ces idées expliquent la division de l'ouvrage en trois grandes parties : 1/ De l'ordre au désordre intergranulaire ; 2/ Du joint de grains idéal au joint de grains réel ; et 3/ Du joint de grains libre au joint de grains contraint. Ce livre s'adresse aux étudiants en thèse, aux ingénieurs et aux chercheurs en Science des matériaux ; il vise également une communauté scientifique désireuse de parfaire ses connaissances sur les solides cristallins et d'appréhender l'enjeu d'une Ingénierie des joints de grains pour l'amélioration des performances des matériaux.

Download or read book Interaction dislocations joints de grains dans le germanium written by Henri-Marc Michaud and published by . This book was released on 1991 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'INTERACTION DISLOCATIONS JOINTS DE GRAINS EST ETUDIEE A PARTIR DE BICRISTAUX DE GERMANIUM CORRESPONDANT MAUX MACLES D'INDICES DE COINCIDENCE DIX NEUF ET CINQUANTE ET UN. LA STRUCTURE ATOMIQUE DE CES INTERFACES EST DETERMINEE PAR MICROSCOPIE ELECTRONIQUE A HAUTE RESOLUTION. LA MEME TECHNIQUE EST UTILISEE POUR REPERTORIER LES DEFAUTS INTERGRANULAIRES RESULTANT DE LA DEFORMATION DU BICRISTAL. LA STRUCTURE DES DEFAUTS LES PLUS SIMPLES EST DETERMINEE ET LEUR HISTORIQUE EST RETRACE DANS LA PLUPART DES CAS. LA DEFORMATION IN SITU DANS UN MICROSCOPE ELECTRONIQUE PERMET DE METTRE CLAIREMENT EN EVIDENCE LE FRANCHISSEMENT DE L'INTERFACE EN TETE D'EMPILEMENT. CONCERNANT LA MACLE D'INDICE DE COINCIDENCE CINQUANTE ET UN, L'INVERSION DE L'ORDRE DES DISLOCATIONS PARTIELLES DE SCHOCKLEY REVELE L'INFLUENCE DE CELUI-CI SUR LE PROCESSUS DE LA TRANSMISSION. UNE EXPERIENCE COMBINANT L'EXPERIMENTATION IN SITU SUIVIE D'OBSERVATIONS EN MICROSCOPIE A HAUTE RESOLUTION A PERMIS DE METTRE EN EVIDENCE DEUX CAS DE DECOMPOSITION DE DISLOCATIONS DE MATRICE EN SOUS-PRODUITS INTERGRANULAIRES. CERTAINS D'ENTRE EUX SONT MOBILES DANS L'INTERFACE PAR GLISSEMENT PUR ALORS QUE D'AUTRES SE DEPLACENT DANS LE JOINT DE GRAINS PAR GLISSEMENT ET MONTEE. UN MODELE EST PROPOSE POUR INTERPRETER LES DIFFERENTS PHENOMENES OBSERVES. IL REPOSE SUR L'HYPOTHESE D'UNE INTERACTION PARTIELLE APRES PARTIELLE ET SUR LE CALCUL DE L'ENERGIE ELASTIQUE ASSOCIE A CHACUN DES DEFAUTS. POUR CHAQUE ETAPE DU PROCESSUS DE L'INTERACTION DISLOCATIONS-JOINTS DE GRAINS, IL PERMET DE SELECTIONNER LES CHEMINS LES PLUS PROBABLES

Download or read book Proceedings of the International Congress Intergranular and Interphase Boundaries in Materials written by Marc Aucouturier and published by . This book was released on 1990 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physics of Solid Solution Strengthening written by E. Collings and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the proceedings of a Symposium entitled "The Physics of Solid-Solution Strengthening in Alloys" which was held at McCormick Place, Chicago, on October 2, 1973, in association with a joint meeting of the American Society for Metals (ASM) and The Metallurgical Society (TMS) of the American Institute of Mining, Metallurgical, and Petroleum Engineers (AIME). The symposium, which was initiated and organized by the editors of this volume, was sponsored by the Committee on Alloy Phases, Institute of Metals Division, TMS, AIME, and the Flow and Fracture Section of the Materials Science Division, ASM. The discipline of Alloy Design has been very active in recent years, during which considerable stress has been placed on the roles of crystallography and microstructure in the rationalization and prediction of properties. Underestimated as a component of alloy design, however, has been the importance of physical property studies, even though physical property measurements have tradi tionally been employed to augment direct or x-ray observations in the determination of phase equilibrium (and, indeed, metastable equilibrium) boundaries.

Download or read book The Glossary of Prosthodontic Terms written by and published by . This book was released on 1994 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microdynamics Simulation written by Paul Bons and published by Springer Science & Business Media. This book was released on 2007-11-21 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete starting package for students and researchers of the earth science community interested in numerical modeling of microstructures. This excellent book deals with the numerical simulation of such microstructures in rocks. It starts with an introduction to existing methods and techniques for optical and electron microscopic analysis. The main part of the book contains examples of numerical modeling of processes and microstructures in rocks, using the software package "ELLE".

Download or read book Biochar for Environmental Management written by Dr. Johannes Lehmann and published by Earthscan. This book was released on 2009 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Biochar is the carbon-rich product when biomass (such as wood, manure, or crop residues) is heated in a closed container with little or no available air. It can be used to improve agriculture and the environment in several ways, and its stability in soil and superior nutrient-retention properties make it an ideal soil amendment to increase crop yields. In addition to this, biochar sequestration, in combination with sustainable biomass production, can be carbon-negative and therefore used to actively remove carbon dioxide from the atmosphere, with major implications for mitigation of climate change. Biochar production can also be combined with bioenergy production through the use of the gases that are given off in the pyrolysis process.This book is the first to synthesize the expanding research literature on this topic. The book's interdisciplinary approach, which covers engineering, environmental sciences, agricultural sciences, economics and policy, is a vital tool at this stage of biochar technology development. This comprehensive overview of current knowledge will be of interest to advanced students, researchers and professionals in a wide range of disciplines"--Provided by publisher.

Download or read book Defects Fracture and Fatigue written by G. Sih and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second International Symposium on Defects, Fracture and Fatigue took place at Mont Gabriel, Quebec, Canada, May 30 to June 5, 1982, and was organized by the Mechanical Engineering Department of McGill University and Institute of Fracture and Solid Mechanics, Lehigh University. The Co-Chairmen of the Sympo sium were Professor G.C. Sih of Lehigh University and Professor J.W. Provan of McGill University. Among those who served on the Organizing Committee were G.C. Sih (Co-Chairman), J.W. Provan (Co-Chairman), H. Mughrabi, H. Zorski, R. Bullough, M. Matczynski, G. Barenblatt and G. Caglioti. As a result of the interest expressed at the First Symposium that was held in October 1980, in Po land, the need for a follow-up meeting to further explore the phenomena of mate rial damage became apparent. Among the areas considered were dislocations, per sistent-slip-bands, void creation, microcracking, microstructure effects, micro/ macro fracture mechanics, ductile fracture criteria, fatigue crack initiation and propagation, stress and failure analysis, deterministic and statistical crack models, and fracture control. This wide spectrum of topics attracted researchers and engineers in solid state physics, continuum mechanics, applied mathematics, metallurgy and fracture mechanics from many different countries. This spectrum is also indicative of the interdisciplinary character of material damage that must be addressed at the atomic, microscopic and macroscopic scale level.

Download or read book Plasticity Theory written by Jacob Lubliner and published by Courier Corporation. This book was released on 2013-04-22 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of Plasticity Theory is to provide a comprehensive introduction to the contemporary state of knowledge in basic plasticity theory and to its applications. It treats several areas not commonly found between the covers of a single book: the physics of plasticity, constitutive theory, dynamic plasticity, large-deformation plasticity, and numerical methods, in addition to a representative survey of problems treated by classical methods, such as elastic-plastic problems, plane plastic flow, and limit analysis; the problem discussed come from areas of interest to mechanical, structural, and geotechnical engineers, metallurgists and others. The necessary mathematics and basic mechanics and thermodynamics are covered in an introductory chapter, making the book a self-contained text suitable for advanced undergraduates and graduate students, as well as a reference for practitioners of solid mechanics.

Download or read book Mechanical Behavior of Materials written by William F. Hosford and published by Cambridge University Press. This book was released on 2010 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a textbook on the mechanical behavior of materials for mechanical and materials engineering. It emphasizes quantitative problem solving. This new edition includes treatment of the effects of texture on properties and microstructure in Chapter 7, a new chapter (12) on discontinuous and inhomogeneous deformation, and treatment of foams in Chapter 21.

Download or read book Extrusion of Aluminium Alloys written by T. Sheppard and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years the importance of extruded alloys has increased due to the decline in copper extrusion, increased use in structural applications, environmental impact and reduced energy consumption. There have also been huge technical advances. This text provides comprehensive coverage of the metallurgical, mathematical and practical features of the process.

Download or read book Engineering Materials 2 written by Michael F. Ashby and published by Elsevier. This book was released on 2014-06-28 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a thorough explanation of the basic properties of materials; of how these can be controlled by processing; of how materials are formed, joined and finished; and of the chain of reasoning that leads to a successful choice of material for a particular application. The materials covered are grouped into four classes: metals, ceramics, polymers and composites. Each class is studied in turn, identifying the families of materials in the class, the microstructural features, the processes or treatments used to obtain a particular structure and their design applications. The text is supplemented by practical case studies and example problems with answers, and a valuable programmed learning course on phase diagrams.

Download or read book Continuum Scale Simulation of Engineering Materials written by Dierk Raabe and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 885 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book fills a gap by presenting our current knowledge and understanding of continuum-based concepts behind computational methods used for microstructure and process simulation of engineering materials above the atomic scale. The volume provides an excellent overview on the different methods, comparing the different methods in terms of their respective particular weaknesses and advantages. This trains readers to identify appropriate approaches to the new challenges that emerge every day in this exciting domain. Divided into three main parts, the first is a basic overview covering fundamental key methods in the field of continuum scale materials simulation. The second one then goes on to look at applications of these methods to the prediction of microstructures, dealing with explicit simulation examples, while the third part discusses example applications in the field of process simulation. By presenting a spectrum of different computational approaches to materials, the book aims to initiate the development of corresponding virtual laboratories in the industry in which these methods are exploited. As such, it addresses graduates and undergraduates, lecturers, materials scientists and engineers, physicists, biologists, chemists, mathematicians, and mechanical engineers.