Download or read book Nanocrystalline and Bimodal Fe Cr Alloys written by Mahesh Brahmadesham Venkataraman and published by . This book was released on 2013 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocrystalline (nc) materials, a single or multi-phase polycrystalline solids with a grain size of
Download or read book Nanostructured Fe Cr Alloys for Advanced Nuclear Energy Applications written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have completed research on the grain-size stabilization of model nanostructured Fe14Cr base alloys at high temperatures by the addition of non-equilibrium solutes. Fe14Cr base alloys are representative for nuclear reactor applications. The neutron flux in a nuclear reactor will generate He atoms that coalesce to form He bubbles. These can lead to premature failure of the reactor components, limiting their lifetime and increasing the cost and capacity for power generation. In order to mitigate such failures, Fe14Cr base alloys have been processed to contain very small nano-size oxide particles (less than 10 nm in size) that trap He atoms and reduce bubble formation. Theoretical and experimental results indicate that the grain boundaries can also be very effective traps for He atoms and bubble formation. An optimum grain size will be less than 100 nm, ie., nanocrystalline alloys must be used. Powder metallurgy methods based on high-energy ball milling can produce Fe-Cr base nanocrystalline alloys that are suitable for nuclear energy applications. The problem with nanocrystalline alloys is that excess grain-boundary energy will cause grains to grow at higher temperatures and their propensity for He trapping will be lost. The nano-size oxide particles in current generation nuclear alloys provide some grain size stabilization by reducing grain-boundary mobility (Zener pinning - a kinetic effect). However the current mitigation strategy minimizing bubble formation is based primarily on He trapping by nano-size oxide particles. An alternate approach to nanoscale grain size stabilization has been proposed. This is based on the addition of small amounts of atoms that are large compared to the base alloy. At higher temperatures these will diffuse to the grain boundaries and will produce an equilibrium state for the grain size at higher temperatures (thermodynamic stabilization - an equilibrium effect). This would be preferred compared to a kinetic effect, which is not based on an equilibrium state. The PI and coworkers have developed thermodynamic-based models that can be used to select appropriate solute additions to Fe14Cr base alloys to achieve a contribution to grain-size stabilization and He bubble mitigation by the thermodynamic effect. All such models require approximations and the proposed research was aimed at alloy selection, processing and detailed atomic-level microstructure evaluations to establish the efficacy of the thermodynamic effect. The outcome of this research shows that appropriate alloy additions can produce a contribution from the thermodynamic stabilization effect. Furthermore, due to the oxygen typically present in nominally high purity elemental powders used for powder metallurgy processing, the optimum results obtained appeared as a synergistic combination of nano-size oxide particle pinning kinetic effect and the grain-boundary segregation thermodynamic effect.
Download or read book High Temperature Corrosion written by Anand S Khanna and published by World Scientific. This book was released on 2016-04-07 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This invaluable book reviews the state of the art of high temperature related problems pertaining to their utility, microstructure, mechanical properties, actual behavior in different environments, their protection by various kinds of coatings at high temperatures and a new concept of nanomaterials at high temperatures.The book begins with fundamentals of oxidation and corrosion. Various concepts relating to the modification or deterioration of mechanical properties when material is exposed to an aggressive environment compared to an inert environment or vacuum are also covered. Other chapters highlight the behavior of various advanced materials to high temperature conditions, an important high temperature effect called Active Element Effect, and many high temperature coatings and their behavior.Written by world-renowned authors in their own field, this book will be useful for professionals and academics in materials science and nanoscience.
Download or read book Amorphous Nanocrystalline Alloys written by A.M. Glezer and published by CRC Press. This book was released on 2017-12-06 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amorphous-nanocrystalline alloys are a relatively new class of materials born from the rapid development of new technologies and different methods of producing amorphous and nanocrystalline powders and films, compacting, melt quenching, megaplastic deformation, implantation, laser, plasma, and other high-energy methods. This book considers methods of producing these materials (melt quenching, controlled crystallization, deformation effect, and pulse treatments (photon, laser and ultrasound), spraying thin films, and ion implantation). Theoretical and experimental studies describe plastic deformation mechanisms and physico-mechanical properties. Practical applications are also presented.
Download or read book Nanocrystalline Fe Pt Alloys written by Julia V. Lyubina and published by Cuvillier Verlag. This book was released on 2006 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been devoted to the study of phase transformations involving chemical ordering and magnetic properties evolution in bulk Fe-Pt alloys composed of nanometer-sized grains. A comprehensive study of phase transformations and ordering in Fe-Pt alloys is performed by a combination of in-situ neutron powder diffraction and thermal analysis. The dependence of ordering processes on the alloy composition and initial microstructure (homogeneous A1 phase or multilayer-type) is established. Through the use of mechanical alloying and subsequent heat treatment it has been possible to achieve the formation of chemically highly ordered L10 FePt and, in the case of the Fe-rich and Pt-rich compositions, L12 Fe3Pt and FePt3 phases, respectively. Whereas in Pt-rich alloys the decoupling effect of the FePt3 phase leads to coercivity improvement, in Fe-rich nanocomposites a peculiar nanometer scale multilayer structure gives rise to remanence enhancement due to large effects of exchange interactions between the crystallites of the phases. The structure, magnetic properties and magnetisation reversal processes of these alloys are investigated. Experimentally observed phenomena are understood on the basis of a simple two-particle interaction model. Neutron diffraction has also been used for the investigation of the magnetic structure of ordered and partially ordered nanocrystalline Fe-Pt alloys. It has been shown that the magnetic moment of Fe atoms in L10-type Fe Pt alloys is sensitive to the compositional order. The results are compared to density functional calculations.
Download or read book Fe Co BASED NANOCRYSTALLINE ALLOYS written by Dr. Shailendra Singh Khinchi and published by Horizon Books ( A Division of Ignited Minds Edutech P Ltd). This book was released on 2015-01-01 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocrystalline FINEMET-type alloys (FeSiBCuNb ) having average grain diameter ~ 10 nm , obtained by the devitrification of rapidly solidified (typically 20 mm thick ribbons) amorphous alloys are attractive for applications due to their excellent soft magnetic properties e. g. – high saturation magnetic induction comparable with Fe-based amorphous alloys and large permeability as observed in Co-based metallic glasses. In Finemet type alloys the presence of small amount of Cu enhances the nucleation rate, while presence of Nb inhibits the grain growth, resulting in nano-crystallization which proved to be key factor for obtaining the particular ultra fine grain structure.
Download or read book Properties and Applications of Nanocrystalline Alloys from Amorphous Precursors written by Bogdan Idzikowski and published by Springer Science & Business Media. This book was released on 2005-03-10 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallic (magnetic and non-magnetic) nanocrystalline materials have been known for over ten years but only recent developments in the research into those complex alloys and their metastable amorphous precursors have created a need to summarize the most important accomplishments in the field. This book is a collection of articles on various aspects of metallic nanocrystalline materials, and an attempt to address this above need. The main focus of the papers is put on the new issues that emerge in the studies of nanocrystalline materials, and, in particular, on (i) new compositions of the alloys, (ii) properties of conventional nanocrystalline materials, (iii) modeling and simulations, (iv) preparation methods, (v) experimental techniques of measurements, and (vi) different modern applications. Interesting phenomena of the physics of nanocrystalline materials are a consequence of the effects induced by the nanocrystalline structure. They include interface physics, the influence of the grain boundaries, the averaging of magnetic anisotropy by exchange interactions, the decrease in exchange length, and the existence of a minimum two-phase structure at the atomic scale. Attention is also paid to the special character of the local atomic ordering and to the corresponding interatomic bonding as well as to anomalies and particularities of electron density distributions, and to the formation of metastable, nanocrystalline (or quasi-crystalline) phases built from exceptionally small grains with special properties. Another important focus of attention are new classes of materials which are not based on new compositions, but rather on the original and special crystalline structure in the nanoscale.
Download or read book Advanced Metallic Interconnect for Solid Oxide Fuel Cells written by Deni Shidqi Khaerudini and published by . This book was released on 2011-11 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanomaterials in Extreme Environments written by Rostislav Andrievski and published by Springer. This book was released on 2015-11-27 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the behaviour of nanomaterials under extreme conditions of high temperature, irradiation by electron/ions and neutrons as well as in mechanical and corrosion extremes. The theoretical approaches and modeling are presented with numerous results of experimental studies. Different processing methods of extreme-tolerant nanomaterials are described. Many application examples from high-temperature technique, nuclear reactors of new generations, aerospace industry, chemical and general engineering, sensor facility, power engineering, electronics, catalysis and medical preparations are also contained. Some unresolved problems are emphasized.
Download or read book An Overview of High energy Ball Milled Nanocrystalline Aluminum Alloys written by Rajeev Kumar Gupta and published by Springer. This book was released on 2017-08-23 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive overview of the nanocrystalline Al based alloys as prepared using high-energy ball milling (HEBM). It discusses the influence of HEBM parameters on grain refinement and examines methods for the consolidation of nanocrystalline Al powders; further, it reviews the effects of various processing parameters on the final microstructure and the impact of microstructure on corrosion and mechanical properties. The book also provides guidelines for choosing appropriate HEBM parameters for the production of nanocrystalline Al powders and methods for consolidating them in net-shaped components. Future challenges and possible applications of high-energy ball milled Al alloys are also discussed. The book is intended for researchers and professionals interested in aluminium alloy development, manufacturing technologies, light metals and nanocrystalline metallic materials.
Download or read book Bimodal Microstructure and Mechanical Properties of Cryomilled Nanocrystalline A1 7 5Mg written by Zonghoon Lee and published by . This book was released on 2003 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microstructure and mechanical properties consisting of tensile behavior and hardness of bulk nanocrystalline Al-7.5Mg alloy were investigated. Grain refinement was achieved by cryomilling of atomized Al-7.5Mg powders and then nanocrystalline powders blended with 15% and 30% coarse-grained Al-7.5Mg powders were consolidated by hot isostatic pressing (HIP) followed by extrusion to produce bulk nanocrystalline Al-7.5Mg alloys. Bimodal structures which enhance ductility and toughness of nanocrystalline metals were produced that consisted of nanocrystalline grains and elongated coarse-grain bands Examination of indentation revealed unusual deformation mechanisms and interactions between the coarse-grain bands and nanocrystalline regions. The ductile coarse-grain bands underwent extensive plastic deformation near indentation while nanocrystalline regions exhibited limited deformation.
Download or read book Proceedings of 17th Edition of International Conference on Emerging Trends in Materials Science and Nanotechnology 2018 written by EuroScicon and published by EuroScicon. This book was released on 2018-04-20 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: April 26-27, 2018 Rome, Italy Key Topics : Nano Electronics, Nanotechnology For Clean Energy And Environment, Nano Applications, Nano Biotechnology, Nano Bio Medicine, Carbon And Graphene Nano-Structures, Polymer Science Engineering, Bio Polymers And Bio Plastics, Advanced Materials Science, Nano Composites, Nano Technology In Materials Science, Corrosion Engineering And Corrosion Protection, Biomaterials, Electronic, Optical & Magnetic Materials., Nano Photonics, Advanced Nano Materials,
Download or read book Handbook of Advanced Magnetic Materials written by Yi Liu and published by Springer Science & Business Media. This book was released on 2008-11-23 with total page 1844 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 2002, the world's first commercial magnetic levitation super-train went into operation in Shanghai. The train is held just above the rails by magnetic levitation (maglev) and can travel at a speed of 400 km/hr, completing the 30km journey from the city to the airport in minutes. Now consumers are enjoying 50 GB hard drives compared to 0.5 GB hard drives ten years ago. Achievements in magnetic materials research have made dreams of a few decades ago reality. The objective of the four volume reference, Handbook of Advanced Magnetic Materials, is to provide a comprehensive review of recent progress in magnetic materials research. Each chapter will have an introduction to give a clear definition of basic and important concepts of the topic. The details of the topic are then elucidated theoretically and experimentally. New ideas for further advancement are then discussed. Sufficient references are also included for those who wish to read the original work. In the last decade, one of the most significant thrust areas of materials research has been nanostructured magnetic materials. There are several critical sizes that control the behavior of a magnetic material, and size effects become especially critical when dimensions approach a few nanometers, where quantum phenomena appear. The first volume of the book, Nanostructured Advanced Magnetic Materials, has therefore been devoted to the recent development of nanostructured magnetic materials, emphasizing size effects. Our understanding of magnetism has advanced with the establishment of the theory of atomic magnetic moments and itinerant magnetism. Simulation is a powerful tool for exploration and explanation of properties of various magnetic materials. Simulation also provides insight for further development of new materials. Naturally, before any simulation can be started, a model must be constructed. This requires that the material be well characterized. Therefore the second volume, Characterization and Simulation provides a comprehensive review of both experimental methods and simulation techniques for the characterization of magnetic materials. After an introduction, each section gives a detailed description of the method and the following sections provide examples and results of the method. Finally further development of the method will be discussed. The success of each type of magnetic material depends on its properties and cost which are directly related to its fabrication process. Processing of a material can be critical for development of artificial materials such as multilayer films, clusters, etc. Moreover, cost-effective processing usually determines whether a material can be commercialized. In recent years processing of materials has continuously evolved from improvement of traditional methods to more sophisticated and novel methods. The objective of the third volume, Processing of Advanced Magnetic Materials, is to provide a comprehensive review of recent developments in processing of advanced magnetic materials. Each chapter will have an introduction and a section to provide a detailed description of the processing method. The following sections give detailed descriptions of the processing, properties and applications of the relevant materials. Finally the potential and limitation of the processing method will be discussed. The properties of a magnetic material can be characterized by intrinsic properties such as anisotropy, saturation magnetization and extrinsic properties such as coercivity. The properties of a magnetic material can be affected by its chemical composition and processing route. With the continuous search for new materials and invention of new processing routes, magnetic properties of materials cover a wide spectrum of soft magnetic materials, hard magnetic materials, recording materials, sensor materials and others. The objective of the fourth volume, Properties and Applications of Advanced Magnetic Materials, is to provide a comprehensive review of recent development of various magnetic materials and their applications. Each chapter will have an introduction of the materials and the principles of their applications. The following sections give a detailed description of the processing, properties and applications. Finally the potential and limitation of the materials will be discussed.
Download or read book Synthesis and Stability of Nanocrystalline Fe Alloys Produced by High Energy Ball Milling written by Robert J. Perez and published by . This book was released on 1997 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light Metals 2016 written by Edward Williams and published by Springer. This book was released on 2016-12-20 with total page 983 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Light Metals symposia are a key part of the TMS Annual Meeting & Exhibition, presenting the most recent developments, discoveries, and practices in primary aluminum science and technology. Publishing the proceedings from these important symposia, the Light Metals volume has become the definitive reference in the field of aluminum production and related light metal technologies. The 2016 collection includes papers from the following symposia: 1.Alumina and Bauxite 2.Aluminum Alloys, Processing, and Characterization 3.Aluminum Reduction Technology 4.Cast Shop Technology 5.Electrode Technology 6.Strip Casting
Download or read book Handbook of Advanced Magnetic Materials written by David J. Sellmyer and published by 清华大学出版社有限公司. This book was released on 2005 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light Metals 2016 written by The Minerals, Metals & Materials Society (TMS) and published by John Wiley & Sons. This book was released on 2016-02-09 with total page 1083 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2016 collection will include papers from the following symposia: Alumina and Bauxite Aluminum Alloys, Processing, and Characterization Aluminum Reduction Technology Cast Shop Technology Electrode Technology Strip Casting
