Contribution à l'évaluation thermodynamique des systèmes polyconstitués à base de nickel PDF Download

Author: Nathalie Dupin
Publisher:
ISBN:
Category :
Languages : fr
Pages : 259

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Book Description

Author: NATHALIE.. DUPIN
Publisher:
ISBN:
Category :
Languages : fr
Pages : 259

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Book Description
LA COEXISTENCE DES PHASES GAMMA DE STRUCTURE CUBIQUE A FACES CENTREES A1 ET GAMMA' DE STRUCTURE CUBIQUE A FACES CENTREES L1#2 CONFERE AUX SUPERALLIAGES BASE NICKEL LEURS EXCEPTIONNELLES PROPRIETES MECANIQUES A HAUTES TEMPERATURES. DES CALCULS THERMODYNAMIQUES BASES SUR L'EVALUATION DES SYSTEMES SIMPLES CONSTITUTIFS DE CES ALLIAGES COMPLEXES, CONTENANT AU MOINS HUIT ELEMENTS, PEUVENT PERMETTRE DE REDUIRE LE NOMBRE D'EXPERIMENTATIONS A ENTREPRENDRE POUR OPTIMISER LEUR COMPOSITIONS ET LES TRAITEMENTS THERMIQUES ASSOCIES. DANS CE BUT, CE TRAVAIL PRESENTE L'ETUDE THERMODYNAMIQUE DES PHASES CONSTITUANT LES SYSTEMES QUATERNAIRES AL-CR-NI-TA ET AL-CR-NI-TI. LA PREMIERE PARTIE PRESENTE LES MODELES ADAPTES A LA DESCRIPTION DU COMPORTEMENT THERMODYNAMIQUE DES PHASES INTERMETALLIQUES ETUDIEES. LA PRESENTATION DU MODELE EN SOUS-RESEAUX EST PARTICULIEREMENT DETAILLEE. LES CONTRAINTES NECESSAIRES A LA DESCRIPTION DES PHASES A1 ET L1#2 PAR UNE MEME EXPRESSION MATHEMATIQUE SONT DERIVEES A PARTIR DE L'IDENTIFICATION DES MODELES A DEUX ET QUATRE SOUS-RESEAUX DE LA PHASE L1#2. LES CHAPITRES SUIVANTS ANALYSENT LES SYSTEMES BINAIRES AL-CO, AL-NI, CR-TA ET TERNAIRES AL-CO-NI, AL-CR-NI, AL-NI-TI, AL-NI-TA, CR-NI-TA ET CR-NI-TI. LES PARAMETRES THERMODYNAMIQUES DECRIVANT LES PHASES CONSTITUANT CES SYSTEMES SONT OBTENUS DANS UN PROCESSUS D'OPTIMISATION PRENANT EN COMPTE L'ENSEMBLE DES DONNEES EXPERIMENTALES, SOUVENT RARES, PUBLIEES SUR CES SYSTEMES. L'EXTENSION DES PARAMETRES THERMODYNAMIQUES AINSI DETERMINES AUX SYSTEMES QUATERNAIRES AL-CR-NI-TA ET AL-CR-NI-TI SANS OPTIMISATION SUPPLEMENTAIRE JUSTIFIE LA DEMARCHE ENTREPRISE. UNE BASE THERMODYNAMIQUE PERMETTANT LE CALCUL DES EQUILIBRES DE PHASES DANS LES SUPERALLIAGES BASE NICKEL A DONC AINSI ETE CONSTITUEE

Author: Madeleine Durand-Charre
Publisher: Routledge
ISBN: 1351409816
Category : Technology & Engineering
Languages : en
Pages : 144

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Book Description
Presents all the main aspects of the microstructure of nickel-base superalloys, and includes micrographs chosen from among a large range of commercial and academic alloys, from the as-cast product to in-situ components, worn from in-service use. Including more than 100 illustrations, the text explains all the transformation mechanisms involved in the origination (creation) of microstructures during solidification or heat treatments (crystallization paths, segregation, crystal orientation, precipitation, TCP, coarsening and rafting, etc.). It includes up-to-date information and data such as phase diagrams, crystallographic structures, and relationships with functional properties. Nearly 300 references provide a key to further investigation.

Author: Y. Austin Chang
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Science
Languages : en
Pages : 330

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Book Description
State-of-the-art experimental techniques used to obtain information on thermodynamic stabilities of alloy phases are presented and discussed in these proceedings from the 1997 Hume Rothery Symposium. Coverage includes an examination of thermodynamic stability and structure of materials in the amorphous state. Also, experimental information obtained for materials in both the stable and metastable state is used to evaluate the thermodynamic models of alloy phases and to calculate phase diagrams.

Author: Radhakanta Rana
Publisher: Springer Nature
ISBN: 3030538257
Category : Technology & Engineering
Languages : en
Pages : 673

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Book Description
The current state of understanding of emerging iron alloys and high-alloy ferrous systems, in comparison with some conventional steels, is compiled in this single volume to further their development. While most of the conventional steels are produced routinely today, many advanced high strength steels and iron-based alloys are still in the laboratory stage. The iron-based emerging alloys can yield high levels of mechanical and physical properties due to their new alloy concepts and novel microstructures leading to multiple benefits of their use in terms of sustainability and environmental impact. This book contains introductory chapters that present the requisite background knowledge on thermodynamics, phase diagrams, and processing routes used for the ferrous alloys to enable the readers a smooth understanding of the main chapters. Then, an overview of the conventional microalloyed steels and advanced high strength steels is given to present the benchmark of the existing steels and ferrous alloys manifesting their current state-of-the-art in terms of physical metallurgy and engineering applications. Subsequent chapters detail novel, emerging ferrous alloys and high-alloy ferrous systems. Summarizes the state-of-the-art of emerging iron-based alloys and the new processing and physical metallurgy-related developments of high-alloy iron systems; Explores new iron-based systems driven by the need for new properties, enhanced performance, sustainable processes and educed environmental impact; Compiles cutting-edge research on the progress of materials science of iron-based systems, from physical metallurgy to engineering applications, and possible avenues for future research.

Author: OECD Nuclear Energy Agency
Publisher: Nuclear Energy Agency
ISBN:
Category : Science
Languages : en
Pages : 788

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Author: R.C. Newton
Publisher: Springer Science & Business Media
ISBN: 1461258715
Category : Science
Languages : en
Pages : 312

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Book Description
Today large numbers of geoscientists apply thermodynamic theory to solu tions of a variety of problems in earth and planetary sciences. For most problems in chemistry, the application of thermodynamics is direct and rewarding. Geoscientists, however, deal with complex inorganic and organic substances. The complexities in the nature of mineralogical substances arise due to their involved crystal structure and multicomponental character. As a result, thermochemical solutions of many geological-planetological problems should be attempted only with a clear understanding of the crystal-chemical and thermochemical character of each mineral. The subject of physical geochemistry deals with the elucidation and application of physico-chemical principles to geosciences. Thermodynamics of mineral phases and crystalline solutions form an integral part of it. Developments in mineralogic thermody namics in recent years have been very encouraging, but do not easily reach many geoscientists interested mainly in applications. This series is to provide geoscientists and planetary scientists with current information on the develop ments in thermodynamics of mineral systems, and also provide the active researcher in this rapidly developing field with a forum through which he can popularize the important conclusions of his work. In the first several volumes, we plan to publish original contributions (with an abundant supply of back ground material for the uninitiated reader) and thoughtful reviews from a number of researchers on mineralogic thermodynamics, on the application of thermochemistry to planetary phase equilibria (including meteorites), and on kinetics of geochemical reactions.

Author: K Hack
Publisher: Elsevier
ISBN: 1845693957
Category : Technology & Engineering
Languages : en
Pages : 489

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Book Description
The Scientific Group Thermodata Europe (SGTE) is a consortium of European and North American research groups developing thermodynamic databases and software to model the thermodynamic properties of metals and other materials. Understanding these properties is critical to improving the processing of metals and their performance in such areas as resistance to high-temperature corrosion. This substantially revised new edition explores both the theoretical background to thermodynamic modelling and its wide range of practical applications. These applications include the analysis of hot salt and other types of high-temperature corrosion, understanding the loss of corrosion resistance in stainless and other types of steel, the processing of steels, as well as the use of thermodynamics to improve the functionality of materials for microelectronics and lighting applications, and in the analysis of nuclear safety issues. New case studies also illustrate applications to kinetically-controlled processes such as the solidification and heat treatment of alloys as well as the production of silicon and titanium oxide pigment. The SGTE casebook is a valuable reference for those manufacturing steels and other materials, those using materials in high-temperature applications such as the power industry and in other areas such as microelectronics and lighting. This updated and revised edition explores theoretical background to thermodynamic modelling Practical applications are provided, including types of high-temperature corrosion Valuable reference for the power and microelectronics industry

Author: H. Brodowsky
Publisher: Springer Science & Business Media
ISBN: 9400910274
Category : Technology & Engineering
Languages : en
Pages : 579

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Book Description
The thermochemistry of alloys has interested generations of scientists and the subject was treated in classical textbooks long ago, e.g. by Hume-Rothery, by Wagner, and by Kubaschewski and Alcock. Nevertheless, the appearance of new materials and the desire to improve traditional materials and metallurgical processes has kept up demand for more information on the thermodynamics of these systems. The advent of computing power has created new opportunities to tie various aspects and properties together, such as phase diagrams and thermodynamic functions, that are in principle thermodynamically inter related but were too cumbersome to work out before. The computer has also been a powerful tool in buUding and testing models that help to explain the underlying causes of non-ideal behavior. At the same time, these calculations have pinpointed areas, where additional and more accurate data are needed. In the laboratory, new methods, improved materials, and sophistica ted instrumentation have gradually changed the way in which experiments are done. Within the time span of perhaps thirty years, the development went from jotting down individual readings of data points to strip chart recording to automatic digital data acquisition. Scholars and students active in the field of "Thermochemistry of Alloys" convened for a NATO Advanced Study Institute at Kiel in August 1987 to discuss these developments. This book collects most of the lectures and seminar papers given at the Institute.

Author: Wolfgang Hummel
Publisher: Universal-Publishers
ISBN: 1581126204
Category : Science
Languages : en
Pages : 589

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Book Description
The Nagra/PSI Chemical Thermodynamic Data Base 01/01 is an encyclopedia of thermodynamic data recommended for environmental studies. The data base focuses on elements commonly found as major solutes in natural waters, and on actinides and fission products relevant for radioactive waste disposal projects. It is the official chemical thermodynamic data base used in Swiss radioactive waste disposal projects. The detailed discussion of every number recommended in this encyclopedia is the result of a multi man-year project of the Paul Scherrer Institut (PSI), a Swiss National Lab. The five authors of this work have many years of experience in research, data base development and the application of thermodynamic data in environmental studies. The data included for many elements are based on their reviews of the basic literature. The data base also includes additional data selected by the authors from recommendations of other experts in ground- water geochemistry and of the international data base project of the Nuclear Energy Agency (NEA).This report is indispensable for every scientist working in the field of environmental studies as the comprehensive source of information on the quality of the thermodynamic data governing particular problems in environmental geochemistry, especially those concerned with the fate of hazardous substances. This enables graduate students, researchers and consultants, as well as regulators and reviewers of scientific papers to assess the scientific basis of environmental modeling studies. The encyclopedia can be used as a stand-alone source of knowledge but amplereferences are provided for readers who wish to go beyond the level of discussion in the book. An electronic version of the data base and a data base management program is available for download at our homepage (http://les.web.psi.ch/TDBbook.htm).