Parameters in Semi-empirical Theories of Alloy Phase Formation PDF Download
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Languages : en
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Many theories of alloy solubility, structural stability of compounds, and heats of formation in alloying rely on parameters such as valence, size or electronegativity for their predictions. Nature, of course, requires only one parameter, the nuclear charge to completely specify all the electronic properties of the elements. Thus, the atomic parameters are, of necessity, initimately connected with one another. This presentation reviews the physical origins of some of the more popular parameters used. The relaionship of the different electronegativity scales to each other, and the relationship of electronegativity to other parameters such as atomic size are emphasized. Structural stability maps employing electronegativity and some other parameters are shown for intermetallic compounds formed from different classes of elements: main group-main group, transition metal-main group, and transition metal-transition metal.
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Languages : en
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Book Description
Many theories of alloy solubility, structural stability of compounds, and heats of formation in alloying rely on parameters such as valence, size or electronegativity for their predictions. Nature, of course, requires only one parameter, the nuclear charge to completely specify all the electronic properties of the elements. Thus, the atomic parameters are, of necessity, initimately connected with one another. This presentation reviews the physical origins of some of the more popular parameters used. The relaionship of the different electronegativity scales to each other, and the relationship of electronegativity to other parameters such as atomic size are emphasized. Structural stability maps employing electronegativity and some other parameters are shown for intermetallic compounds formed from different classes of elements: main group-main group, transition metal-main group, and transition metal-transition metal.
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Category : Aeronautics
Languages : en
Pages : 556
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Category : Power resources
Languages : en
Pages : 1346
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Author: J. A. Alonso
Publisher: Academic Press
ISBN: 0080984495
Category : Technology & Engineering
Languages : en
Pages : 616
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Book Description
This book is a broad review of the electronic structure of metals and alloys. It emphasises the way in which the behavior of electrons in these materials governs the thermodynamic and other properties of these conducting materials. The theoretical treatment proceeds from a wave mechanics approach to more sophisticated techniques for the description of the properties of metals and alloys.
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 784
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Author: S Steeb
Publisher: Elsevier
ISBN: 0444601112
Category : Technology & Engineering
Languages : en
Pages : 1163
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Rapidly Quenched Metals, Volume I covers the proceedings of the Fifth International Conference on Rapidly Quenched Metals, held in Wurzburg, Germany on September 3-7, 1984. The book focuses on amorphous and crystalline metals formed by rapid quenching from the melt. The selection first covers the scope and trends of developments in rapid solidification technology, rapid solidification, and undercooling of liquid metals by rapid quenching. Discussions focus on experimental method, powders, strip, particulate production, consolidation, and alloys and alloy systems. The text then examines the solidification of undercooled liquid alloys entrapped in solid; crystallization kinetics in undercooled droplets; and grain refinement in bulk undercooled alloys. The manuscript tackles the undercooling of niobium-germanium alloys in a 100 meter drop tube; influence of process parameters on the cooling rate of the meltspinning process; and the mechanism of ribbon formation in melt-spun copper and copper-zirconium. The formation and structure of thick sections of rapidly-solidified material by incremental deposition and production of ultrafine dispersions of rare earth oxides in Ti alloys using rapid solidification are also mentioned. The selection is a valuable reference for physicists, chemists, physical metallurgists, and engineers.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309178517
Category : Technology & Engineering
Languages : en
Pages : 76
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Book Description
In order to ensure effective military operations and continued warfighter safety, the functionality and integrity of the equipment used must also be ensured. For the past several years, the Nondestructive Evaluation Branch at the Air Force Research Laboratory (AFRL) has focused actively on the development of embedded sensing technologies for the real-time monitoring of damage states in aircraft, turbine engines, and aerospace structures. These sensing technologies must be developed for use in environments ranging from the normal to the extreme, confronting researchers with the need to understand issues involving reliability, wireless telemetry, and signal processing methods. Additionally, there is a need to develop science and technology that will address the sensing of a material state at the microstructure level, precursor damage at the dislocation level, and fatigue-crack size population. To address these issues, the National Research Council convened a workshop at which speakers gave their personal perspectives on technological approaches to understanding materials state and described potential challenges and advances in technology. This book consists primarily of extended abstracts of the workshop speakers' presentations, conveying the nature and scope of the material presented.
Author:
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Category : Metallurgy
Languages : en
Pages : 1234
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Author: Srikumar Banerjee
Publisher: Elsevier
ISBN: 0080548792
Category : Technology & Engineering
Languages : en
Pages : 837
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The terms phase transitions and phase transformations are often used in an interchangeable manner in the metallurgical literature. In Phase Transformations, transformations driven by pressure changes, radiation and deformation and those occurring in nanoscale multilayers are brought to the fore. Order-disorder transformations, many of which constitute very good examples of continuous transformations, are dealt with in a comprehensive manner. Almost all types of phase transformations and reactions that are commonly encountered in inorganic materials are covered and the underlying thermodynamic, kinetic and crystallographic aspects elucidated. - Shows readers the advancements in the field - due to enhanced computing power and superior experimental capability - Drawing upon the background and the research experience of the authors, bringing together a wealth of experience - Written essentially from a physical metallurgists view point
Author:
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ISBN:
Category :
Languages : en
Pages : 1120
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