Energy Of Ordered And Disordered Copper Gold Alloys
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The Heats of Formation of Solid Gold-copper Alloys
Author | : Raymond Leonard Orr |
Publisher | : |
Total Pages | : 82 |
Release | : 1956 |
Genre | : Gold-copper alloys |
ISBN | : |
Calculated Cohesive Energy of the Ordered Copper-gold Alloy Cu Au I
Author | : Richard Worrell Hannum |
Publisher | : |
Total Pages | : 166 |
Release | : 1966 |
Genre | : Gold-copper alloys |
ISBN | : |
"The chief purpose of cohesive energy calculations is to develop analytical methods which give a valid theoretical basis for cohesion, which explain why the ordered alloy has the observed crystal structure, and which give numerical results in agreement with the measured values. The distribution of electrons around the atoms is known only approximately in most crystal lattices, and cohesive energy calculations are very sensitive to the electron distribution assumed. The net cohesive energy depends chiefly upon the difference between two larger quantifies, the boundary energy of a valence electron, which promotes cohesion, and the Fermi energy, which opposes it. A calculation of correct values of cohesive energy indicates that the assumed electron distribution is correct. In the present work, an analysis is made of the nature of binding in the pure metals and the alloy to provide a basis for calculating the energy of binding. The calculations are then made, using the best procedure for each part, and the results are compared with values obtained by experiment. It is found that when account is taken of cohesion from the d-electrons, using the tight-binding approximation, calculated cohesive energies for the pure metals copper and gold are nearer to the experimental values than in previous calculations, which gave too small results. The strong electron binding between unlike atoms also indicates why the alloy has a tetragonal structure while the pure metals are face-centered cubic"--Introduction, leaves 1-2.
Characterization of Copper-gold Alloy Single-crystal Surfaces
Author | : Harold Claude Potter |
Publisher | : |
Total Pages | : 278 |
Release | : 1970 |
Genre | : Copper alloys |
ISBN | : |
Heat Capacity and Degree of Order in Solid Gold-copper Alloys
Author | : Jean Luciat-Labry |
Publisher | : |
Total Pages | : 34 |
Release | : 1958 |
Genre | : Gold-copper alloys |
ISBN | : |
Metals and Materials
Author | : R. E. Smallman |
Publisher | : Elsevier |
Total Pages | : 445 |
Release | : 2013-10-22 |
Genre | : Technology & Engineering |
ISBN | : 1483141039 |
Metals and Materials: Science, Processes, Applications aims to present the science of materials in a readable and concise form that leads naturally to an explanation of the ways in which materials are processed and applied. The science of metals, or physical metallurgy, has developed naturally into the wider and more diverse discipline of materials science. The study of metals and alloys still forms a large and important part of this relatively new discipline, but it’s common to find that fundamental principles and concepts of physical metallurgy can be adapted to explain the behavior of a variety of non-metallic materials. As an aid to fully study this discipline, each chapter has been supplemented with a list of specialized references. These references include images and diagrams that illustrate the subtleties of materials, such as micrographs of grain structures and fine-scale defects, phase diagrams for metals and ceramics, electron diffraction patterns revealing atomic arrangements, specific property diagrams correlating the behavior of different materials, and slip vector diagrams for deforming crystals. Throughout this book, sufficient background and theory is provided to assist students in answering questions about a large part of a typical degree course in materials science and engineering. Some sections provide a background or point of entry for postgraduate studies and courses.