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Mecanismes De Deformation Et Resistance A La Rupture Des Polycristaux A Grains Ultra Fins
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Book Synopsis Mécanismes de déformation et résistance à la rupture des polycristaux à grains ultra-fins by : Lukasz Farbaniec
Download or read book Mécanismes de déformation et résistance à la rupture des polycristaux à grains ultra-fins written by Lukasz Farbaniec and published by . This book was released on 2012 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de cette thèse est à travers deux thèmes fondamentaux d’étudier et analyser les mécanismes de déformation et de rupture des polycristaux cubiques à faces centrées à grains ultra-fins. Dans le premier thème la déformation plastique est considérée comme un procédé de fragmentation des grains en blocs plus petits. À cet effet, la technique dite du poids tombant (développée au SMMA-Supméca) qui est un procédé de déformation plastique en régime dynamique est utilisée pour l'affinement des grains de nickel polycristallin. Les mécanismes d’affinement et de déformation sont ensuite analysées expérimentalement et numériquement par transformée de Fourier rapide (Fast Fourier Transform). Le deuxième thème traite de l'influence de la tri-axialité sur la ténacité des matériaux ductiles ainsi que de l'identification des mécanismes conduisant à la rupture en traction. À cette fin, des essais de traction sur mini-éprouvettes à entaille circulaire et des techniques de modélisation numérique sont développés et mis en oeuvre pour prédire le comportement à la rupture du nickel polycristallin et d’un acier. Les résultats obtenus sont utilisés pour formuler un critère appliquable au chargement d'une fissure. Les résultats numériques sont comparés avec les données expérimentales pour valider la procédure et estimer la ténacité des matériaux étudiés.
Book Synopsis X-Ray and Neutron Reflectivity: Principles and Applications by : Jean Daillant
Download or read book X-Ray and Neutron Reflectivity: Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Book Synopsis Graphite Intercalation Compounds II by : Hartmut Zabel
Download or read book Graphite Intercalation Compounds II written by Hartmut Zabel and published by Springer Science & Business Media. This book was released on 2013-03-07 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research on graphite intercalation compounds often acts as a forerunner for research in other sciences. For instance, the concept of staging, which is fundamental to graphite intercalation compounds, is also relevant to surface science in connection with adsorbates on metal surfaces and to high-temperature superconducting oxide layer materials. Phonon-folding and mode-splitting effects are not only basic to graphite intercalation compounds but also to polytypical systems such as supercon ductors, superlattices, and metal and semiconductor superlattices. Charge transfer effects playa tremendously important role in many areas, and they can be most easily and fundamentally studied with intercalated graphite. This list could be augmented with many more examples. The important message, however, is that graphite inter calation compounds represent a class of materials that not only can be used for testing a variety of condensed-matter concepts, but also stimulates new ideas and approaches. This volume is the second of a two-volume set. The first volume addressed the structural and dynamical aspects of graphite intercalation compounds, together with the chemistry and intercalation of new compounds. This second volume provides an up-to-date status report from expert researchers on the transport, magnetic, elec tronic and optical properties ofthis unique class of materials. The band-structure cal culations of the various donor and acceptor compounds are discussed in depth, and detailed reviews are provided ofthe experimental verification ofthe electronic struc ture in terms of their photoemission spectra and optical properties.
