Download or read book Elastic Effects in Diverse Material Systems Phase Separations of Coherent Binary Alloys and Carbon Nanotube Systems written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The role of elastic strain is found to have dominant effects in twodisparate topics in materials physics. Specifically, the first partdiscusses large-scale three dimensional simulations of the phaseseparation process for elastically-coherent binary alloys withand without external strain. The second part focuses on the elasticeffects and electrical properties of addimer-induced defects on carbonnanotubes. For both two- and three-dimensional binary alloys, the effects of long-range elastic fields on the phase separationprocess with and without external strain were investigated withlarge-scale Langevin simulations. The elastic effects incorporated inthe model are the result of anisotropy and dilational misfitsintroduced via inhomogeneities in the elastic constants of theconstituents. To understand the domain morphology, a developedselection criterion indicates their shape and/or orientationbased on the system's shear moduli. Subjected to external stresses, precipitates and theirorientation can be altered continuously intolamellar configurations. For moderate external strain, late-time, large-scale splitting of domains is observed. Other aspects ofthe coarsening process---dynamic scaling of the correlationfunctions and local inverse coarsening---are also discussed. With tension in carbon nanotubes, the presence of addimers are shownthrough classical molecular dynamics and tight binding simulations toform defects that wrap themselves about thenanotube, which are short segments of a tube with a changed helicity. Such formations can lead to nanotube-based quantum dots. Theseheterojunctions are most favorable for (n,0) zigzagtubes, where addimers induce plastic transformationson these otherwise brittle tubes. These defects and heterojunctions are also investigated through STMimages and conductance signatures. Prominent "ring-like'' features are observed in the STM images, whose positions correlate with the underlying geometry of the defect. By contrast, most of the defectshave.
Download or read book Elastic Effects in Diverse Material Systems written by Daniel Anthony Orlikowski and published by . This book was released on 2000 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: Ostwald ripening, Universal scaling, Nanotechnology, Condense matter, Computational physics, Tight binding, Molecular dynamics.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of elastic stress on phase selection in a binary system written by William C. Johnson and published by . This book was released on 1994 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Separation Coupled with Damage Processes written by Christian Heinemann and published by Springer Science & Business Media. This book was released on 2014-03-24 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors explore a unifying model which couples phase separation and damage processes in a system of partial differential equations. The model has technological applications to solder materials where interactions of both phenomena have been observed and cannot be neglected for a realistic description. The equations are derived in a thermodynamically consistent framework and suitable weak formulations for various types of this coupled system are presented. In the main part, existence of weak solutions is proven and degenerate limits are investigated.
Download or read book Statics and Dynamics of Alloy Phase Transformations written by Patrice E.A. Turchi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of phase transformations in substitutional alloys, including order disorder phenomena and structural transformations, plays a crucial role in understanding the physical and mechanical properties of materials, and in designing alloys with desired technologically important characteristics. Indeed, most of the physical properties, including equilibrium properties, transport, magnetic, vibrational as well as mechanical properties of alloys are often controlled by and are highly sensitive to the existence of ordered compounds and to the occurrence of structural transformations. Correspondingly, the alloy designer facing the task of processing new high-performance materials with properties that meet specific industrial applications must answer the following question: What is the crystalline structure and the atomic configuration that an alloy may exhibit at given temperature and concentration? Usually the answer is sought in the phase-diagram of a relevant system that is often determined experimentally and does not provide insight to the underlying mechanisms driving phase stability. Because of the rather tedious and highly risky nature of developing new materials through conventional metallurgical techniques, a great deal of effort has been expended in devising methods for understanding the mechanisms contrOlling phase transformations at the microscopic level. These efforts have been bolstered through the development of fully ab initio, accurate theoretical models, coupled with the advent of new experimental methods and of powerful supercomputer capabilities.
Download or read book The Ordering Phase Separation Transition in Alloys written by Yuri Ustinovshikov and published by Cambridge Scholars Publishing. This book was released on 2019-07-12 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of the transition “ordering-phase separation”, which occurs in alloys when the sign of the chemical interaction between neighboring atoms A and B changes with temperature, has shown that a whole direction in science, namely Materials Science, has not fully moved on from the ideas of the previous century. The theories about the nature of alloys which have been implanted in us as students have turned out not to be correct enough to explain the processes present in alloys under thermal influence. In fact, these processes are determined only by the chemical interaction between nearest atoms A and B. Therefore, this book is the first publication to present exhaustive experimental and theoretical evidence proving the validity of this thesis for alloys. This radically changes our outlook on the nature of alloys, and makes it possible to rationalize the technology of heat treatment of alloys, compelling us to address the correction of existing phase diagrams and to use a conscious approach to the design of new alloys instead of the empirical one.
Download or read book Elastic Effects in Binary Alloy Ordering written by David L. Olmsted and published by . This book was released on 1999 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On a Model for Phase Separation in Binary Alloys Driven by Mechanical Effects written by and published by . This book was released on 2001 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Nanotubes written by M. Endo and published by Elsevier. This book was released on 2013-10-22 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes have been studied extensively in relation to fullerenes, and together with fullerenes have opened a new science and technology field on nano scale materials. A whole range of issues from the preparation, structure, properties and observation of quantum effects in carbon nanotubes in comparison with 0-D fullerenes are discussed. In addition, complementary reviews on carbon nanoparticles such as carbon nano-capsules, onion-like graphite particles and metal-coated fullerenes are covered. This book aims to cover recent research and development in this area, and so provide a convenient reference tool for all researchers in this field. It is also hoped that this book can serve to stimulate future work on carbon nanotubes.
Download or read book Field Assisted Sintering written by Eugene A. Olevsky and published by Springer. This book was released on 2018-08-09 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the first ever scientific monograph including an in-depth analysis of all major field-assisted sintering techniques. Until now, the electromagnetic field-assisted technologies of materials processing were lacking a systematic and generalized description in one fundamental publication; this work promotes the development of generalized concepts and of comparative analyses in this emerging area of materials fabrication. This book describes modern technologies for the powder processing-based fabrication of advanced materials. New approaches for the development of well-tailored and stable structures are thoroughly discussed. Since the potential of traditional thermo-mechanical methods of material treatment is limited due to inadequate control during processing, the book addresses ways to more accurately control the resultant material's structure and properties by an assisting application of electro-magnetic fields. The book describes resistance sintering, high-voltage consolidation, sintering by low-voltage electric pulses (including spark plasma sintering), flash sintering, microwave sintering, induction heating sintering, magnetic pulse compaction and other field-assisted sintering techniques. Includes an in-depth analysis of all major field-assisted sintering techniques; Explains new techniques and approaches for material treatment; Provides detailed descriptions of spark plasma sintering, microwave sintering, high-voltage consolidation, magnetic pulse compaction, and various other approaches when field-assisted treatment is applied.
Download or read book Nanomaterials by Severe Plastic Deformation written by Michael J. Zehetbauer and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings of the "Second International Conference on Nanomaterials by Severe Plastic Deformation" review the enormous scientific avalanche that has been developing in the field over recent years. A valuable resource for any scientist and engineer working in this emerging field of nanotechnology.
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2006 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Complex Inorganic Solids written by Patrice E. A. Turchi and published by Springer Science & Business Media. This book was released on 2007-12-31 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the key aspects of this volume is to cut across the traditional taxonomy of disciplines in the study of alloys. Hence there has been a deliberate attempt to integrate the different approaches taken towards alloys as a class of materials in different fields, ranging from geology to metallurgical engineering. The emphasis of this book is to highlight commonalities between different fields with respect to how alloys are studied. The topics in this book fall into several themes, which suggest a number of different classification schemes. We have chosen a scheme that classifies the papers in the volume into the categories Microstructural Considerations, Ordering, Kinetics and Diffusion, Magnetic Considerations and Elastic Considerations. The book has juxtaposed apparently disparate approaches to similar physical processes, in the hope of revealing a more dynamic character of the processes under consideration. This monograph will invigorate new kinds of discussion and reveal challenges and new avenues to the description and prediction of properties of materials in the solid state and the conditions that produce them.
Download or read book Adsorption and Phase Behaviour in Nanochannels and Nanotubes written by Lawrence J. Dunne and published by Springer Science & Business Media. This book was released on 2009-09-24 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Channels of nanotubular dimensions exist in a variety of materials (examples are carbon nanotubes and the nanotubular channels of zeolites and zeotypes) and show promise for numerous applications due to their unique properties. One of their most important properties is their capacity to adsorb molecules and these may exist in a variety of phases. "Adsorption and Phase Behaviour in Nanochannels and Nanotubes" provides an excellent review of recent and current work on adsorption on nanometerials. It is an impressive collection of papers dealing with the adsorption and phase behaviour in nanoporous materials from both experimental and theoretical perspectives. "Adsorption and Phase Behaviour in Nanochannels and Nanotubes" focuses on carbon nanotubes as well as zeolites and related materials.
Download or read book Nanostructure Science and Technology written by Richard W. Siegel and published by Springer Science & Business Media. This book was released on 1999-09-30 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Timely information on scientific and engineering developments occurring in laboratories around the world provides critical input to maintaining the economic and technological strength of the United States. Moreover, sharing this information quickly with other countries can greatly enhance the productivity of scientists and engineers. These are some of the reasons why the National Science Foundation (NSF) has been involved in funding science and technology assessments comparing the United States and foreign countries since the early 1980s. A substantial number of these studies have been conducted by the World Technology Evaluation Center (WTEC) managed by Loyola College through a cooperative agreement with NSF. The National Science and Technology Council (NSTC), Committee on Technology's Interagency Working Group on NanoScience, Engineering and Technology (CT/IWGN) worked with WTEC to develop the scope of this Nanostucture Science and Technology report in an effort to develop a baseline of understanding for how to strategically make Federal nanoscale R&D investments in the coming years. The purpose of the NSTC/WTEC activity is to assess R&D efforts in other countries in specific areas of technology, to compare these efforts and their results to U. S. research in the same areas, and to identify opportunities for international collaboration in precompetitive research. Many U. S. organizations support substantial data gathering and analysis efforts focusing on nations such as Japan. But often the results of these studies are not widely available. At the same time, government and privately sponsored studies that are in the public domain tend to be "input" studies.
Download or read book Carbon Nanotubes written by M. Meyyappan and published by CRC Press. This book was released on 2004-07-28 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes, with their extraordinary mechanical and unique electronic properties, have garnered much attention in the past five years. With a broad range of potential applications including nanoelectronics, composites, chemical sensors, biosensors, microscopy, nanoelectromechanical systems, and many more, the scientific community is more moti
