Download or read book Enhancement of Grain Refined Microstructure in a Nanostructured Metals Via Ultrahigh Pressure Hydrostatic Consolidation Process Construction of Master Sintering Curve MSC and Its Application to Densification of Al Mg Alloy written by and published by . This book was released on 2010 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previously Al-Mg alloy was densified by hot isostatic processing and subsequently consolidated by hydrostatic extrusion. Through this process high strength and high formability nanostructured bulk Al-Mg alloy was fabricated. However, it is important to handle parametric control in powder metallurgical processing in terms of relative density, which is closely associated with its mechanical properties in acquiring a material of a desired property. At current stage processing parameter of density function is not controllable. In this study a concept of Master Sintering Curve (MSC) theory was introduced and applied to the examined material during densification to obtain a unified MSC allowing for predicting density variation in terms of only sintering time and temperature in regardless of thermal history at certain compaction pressure. After completing MSC new experimental set of time-temperature data were fitted to validate the derived MSC curve in such a way that it is completely coincident with new set of experimental data in tolerable error. Hardness measurement was conducted to study the effect of heating rates.
Download or read book Sintering written by Ricardo Castro and published by Springer Science & Business Media. This book was released on 2012-09-09 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sintering process studies have re-emerged strongly in the past decade due to extensive discussions about the stabilization of nanoparticles and nanostructures, and the development of controlled nanograined bulk materials. This book presents the state-of-art in experiments and theory of novel sintering processes, traditional sintering and grain growth. The scope ranges from powder metallurgy to ceramic and composites processing. The challenges of conventional and novel sintering and grain growth in nanopowders and nanostructures are addressed, being useful for students as well as professionals interested in sintering at the nanoscale.
Download or read book Synthesis Microstructure and Electric Field Assisted Sintering of Nanocrystalline Magnesium Aluminate written by Jorgen Fredrick Rufner and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the powder processing community there has been a large drive to develop techniques for generating bulk nanostructured polycrystalline ceramic materials. To that end, various types of nanoparticle and interface engineering have been performed through the modification or exploitation of surface and grain boundary energies. Not only have interface energies been explored, processing techniques have also developed to aid in the consolidation of nanopowders through the application of an electric field or current during sintering. These processes go by many names but EFAS techniques has been shown to provide improvements during sintering such as enhancing rates of densification, decreasing sintering temperatures, reducing required applied pressures, and grain growth suppression across a wide range of materials, however the underlying mechanisms responsible are still unclear and widely debated. This work had 2 primary goals: 1) create and characterize nanoparticles of such a small size that their large excess energy generates a driving force for densification that allows for the reduction of traditional sintering time and temperature toward achieving dense nanocrystalline magnesium aluminate; 2) deconvolute the complex system that is EFAS and determine the influence of electrostatic fields (non-contact electric field) on the sintering and grain growth behavior of electrically non-conductive dielectric ceramic materials. The motivation for this lies in delineating the role of each individual variable during EFAS so the process can be tuned with the a-priori knowledge of what the resultant microstructure will be. Through tuning solution synthesis methods, magnesium aluminate nanoparticles were successfully synthesized via a co-precipitation method with an average size 5-6 nm. When traditionally sintered in a tube furnace at 1300°C in air, densification rates were high enough that only after 10 minutes sample relative density reached above 90% with an ultimate final density of 96% after only 20 minutes. This was a noticeable improvement from the typical conditions required for isothermal sintering of magnesium aluminate which are at temperatures above 1600°C for hours rather than minutes. In addition, a second synthesis method, the polymer precursor or Pechini method, was investigated for its well-known ability to create multi-cation oxide ceramics but gave very different results. For the case of MgAl2O4 it resulted in porous, tightly bound agglomerates made up of approximately 20nm nanocrystals and a volume fraction porosity of [phi][subscript vol] = 21.6 ± 3.7%. Scanning and transmission electron microscopy (TEM) was performed on individual agglomerates showcasing their bimodal pore structure of large sub-micron to micron sized pores alongside a dominant network of smaller nanosized pores. The pore structure was found to be very stable and significantly inhibit powder densification during sintering to only 55% relative density, regardless of sintering temperature or time. The mechanical strength of the agglomerates was quantitatively measured through TEM in-situ nanoindentation and was found to be the chief inhibiting factor during sintering. Deformation behavior of the agglomerates under compression followed three distinct failure mechanisms, unique to honeycomb/nanofoam structures, with complete fracture occurring at a stress of 2.75 ± 0.35GPa. Details as to how and why the synthesis method generated the porous structure and not small individual nanoparticles, as with the co-precipitated powder, are explained. Since surface and interface energetics play a critical role for densification during sintering, it was critical that the surface reactivity of such small nanoparticles be studied. This was performed by surface water adsorption where small controlled doses of water vapor were adsorbed onto anhydrous particle surfaces and the associated enthalpy of adsorption measured. It was apparent from the heat of adsorption data that more than just surface adsorption was occurring when water interacted with the nanoparticles. Upon further investigation, water was found to react with the particle surface creating magnesium hydroxide as well as atomic disordering of the surface. This endothermic surface reaction continues with the addition of more water such that when powder was completely submerged, large 2-dimensional amorphous hydroxide structures were seen cutting through the particle agglomerates. The adsorption of even small amounts of water by metal oxide nanoparticles has implications in that environmental humidity during processing can alter the way in which these nanomaterials sinter and densify. Finally, the synthesized nanopowders were used to study the effect of a 1000V/cm DC electric field on the densification and grain growth behavior during sintering. No appreciable change was observed in final density or densification rate with the application of the electric field, however, the average grain size of the field sintered sample was larger than that sintered with no field. To further clarify the experimental system, samples were annealed from full density to isolate grain growth mechanisms from densification mechanisms. The enhanced grain boundary mobility (grain growth) was again observed to be higher with the applied field. Nuclear resonance spectroscopy (NMR) and various TEM techniques including orientation image mapping (OIM), electron energy loss spectroscopy (EELS), and high resolution microscopy (HRTEM) were all used to determine local chemistry, structure, and bonding environments to elucidate how electric fields affect grain boundary mobility in electrically non-conductive ceramics.
Download or read book Sintering Applications written by Burcu Ertug and published by BoD – Books on Demand. This book was released on 2013-02-06 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sintering is one of the final stages of ceramics fabrication and is used to increase the strength of the compacted material. In the Sintering of Ceramics section, the fabrication of electronic ceramics and glass-ceramics were presented. Especially dielectric properties were focused on. In other chapters, sintering behaviour of ceramic tiles and nano-alumina were investigated. Apart from oxides, the sintering of non-oxide ceramics was examined. Sintering the metals in a controlled atmosphere furnace aims to bond the particles together metallurgically. In the Sintering of Metals section, two sections dealt with copper containing structures. The sintering of titanium alloys is another topic focused in this section. The chapter on lead and zinc covers the sintering in the field of extractive metallurgy. Finally two more chapter focus on the basics of sintering,i.e viscous flow and spark plasma sintering.
Download or read book Textbook of Nanoscience and Nanotechnology written by B.S. Murty and published by Springer Science & Business Media. This book was released on 2013-12-06 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is meant to serve as a textbook for beginners in the field of nanoscience and nanotechnology. It can also be used as additional reading in this multifaceted area. It covers the entire spectrum of nanoscience and technology: introduction, terminology, historical perspectives of this domain of science, unique and widely differing properties, advances in the various synthesis, consolidation and characterization techniques, applications of nanoscience and technology and emerging materials and technologies.
Download or read book Characterization of Minerals Metals and Materials 2020 written by Jian Li and published by Springer Nature. This book was released on 2020-01-23 with total page 723 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection gives broad and up-to-date results in the research and development of materials characterization and processing. Topics covered include advanced characterization methods, minerals, mechanical properties, coatings, polymers and composites, corrosion, welding, magnetic materials, and electronic materials. The book explores scientific processes to characterize materials using modern technologies, and focuses on the interrelationships and interdependence among processing, structure, properties, and performance of materials.
Download or read book THERMEC 2018 written by R. Shabadi and published by Trans Tech Publications Ltd. This book was released on 2018-12-26 with total page 2604 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of the THERMEC2018: 10th International Conference on Processing and Manufacturing of Advanced Materials, which took place between July 09 and July 13, 2018 in Paris, France, under the co-sponsorship of Universite de Lille, MINES ParisTech, PSL and Universite de Tours, France. The presented book will be useful for many researchers and engineers/technologists working in different aspects of processing and fabrication of materials, structure/property evaluation and applications of both ferrous and nonferrous materials including biomaterials, smart materials as well as the advanced measurement techniques in the materials science.
Download or read book Sintering Technology written by Randall M. German and published by CRC Press. This book was released on 2020-09-30 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the sintering conference held at the Pennsylvania State University, USA, this text presents advances in the application of sintering to the most important industrial materials. It offers results on both solid-state and microphase sintering as well as microstructure evolution, and introduces new applications, processes, materials and solutions to technical problems.
Download or read book Nanostructured Films and Coatings written by Gan-Moog Chow and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured films and coatings possess unique properties due to both size and interface effects. They find many applications in areas such as electronics, catalysis, protection, data storage, optics and sensors. The focus of the present book is on synthesis and processing; advanced characterization techniques; properties (including mechanical, chemical, electronic, thermal, catalytic, and magnetic); modelling of interlayer and intralayer interfaces; and applications.
Download or read book Recent Trends in Mechanical Engineering written by G. S. V. L. Narasimham and published by Springer Nature. This book was released on 2020-10-30 with total page 697 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of peer-reviewed proceedings from the International Conference on Innovations in Mechanical Engineering (ICIME 2020). The contents cover latest research in all major areas of mechanical engineering, and are broadly divided into five parts: (i) thermal engineering, (ii) design and optimization, (iii) production and industrial engineering, (iv) materials science and metallurgy, and (v) multidisciplinary topics. Different aspects of designing, modeling, manufacturing, optimizing, and processing are discussed in the context of emerging applications. Given the range of topics covered, this book can be useful for students, researchers as well as professionals.
Download or read book Friction Stir Welding and Processing X written by Yuri Hovanski and published by Springer. This book was released on 2019-02-11 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a compilation of the recent progress on friction stir technologies including high-temperature applications, industrial applications, dissimilar alloy/materials, lightweight alloys, simulation, control, characterization, and derivative technologies. The volume offers a current look at friction stir welding technology from application to characterization and from modeling to R&D. Contributions document advances in application, controls, and simulation of the friction stir process to aid researchers in seeing the current state-of-the-art.
Download or read book Emerging Trends in Mechanical Engineering written by L. Vijayaraghavan and published by Springer Nature. This book was released on 2019-12-11 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select proceedings of the International Conference on Emerging Trends in Mechanical Engineering (ICETME 2018). The book covers various topics of mechanical engineering like computational fluid dynamics, heat transfer, machine dynamics, tribology, and composite materials. In addition, relevant studies in the allied fields of manufacturing, industrial and production engineering are also covered. The applications of latest tools and techniques in the context of mechanical engineering problems are discussed in this book. The contents of this book will be useful for students, researchers as well as industry professionals.
Download or read book Tribological Applications of Composite Materials written by Mohamed Thariq Hameed Sultan and published by Springer Nature. This book was released on 2020-12-14 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the current advances and practices in tribological applications of composite materials under various processes, presenting the development, characterization, and morphological properties of composite materials in tribological applications. It covers a wide range of subjects, extending from fundamental research on the tribological characteristics of various multi-phase materials to the final applications of composites in wear loaded, technical components. It brings together contributions from researchers who discusses innovative experimental approaches and analytical techniques, creating a reference with comprehensive coverage of modern research techniques and the potential application of tribological composites in biomedical, aerospace, automotive, marines and construction industries. This volume will be of interest to material science researchers working in both industry and academia
Download or read book Materials Science of Carbides Nitrides and Borides written by Yury G. Gogotsi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: A survey of current research on a wide range of carbide, nitride and boride materials, covering the general issues relevant to the development and characterisation of a variety of advanced materials. Topics include structure and electronic properties, modeling, processing, high-temperature chemistry, oxidation and corrosion, mechanical behaviour, manufacturing and applications. The volume complements more specialised books on specific materials as well as more general texts on ceramics or hard materials, presenting a survey of materials research as a key to technological development. After decades of research, the materials are being used in electronics, wear resistant, refractory and other applications, but numerous new applications are possible. Roughly equal numbers of papers cover theoretical and experimental research in the general field of materials science of refractory materials. Audience: Researchers and graduate students in materials science and engineering.
Download or read book Thermodynamics and Biophysics of Biomedical Nanosystems written by Costas Demetzos and published by Springer. This book was released on 2019-03-04 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the recent advances of thermodynamics and biophysics in drug delivery nanosystems and in biomedical nanodevices. The up-to-date book provides an in-depth knowledge of bio-inspired nanotechnological systems for pharmaceutical applications. Biophysics and thermodynamics, supported by mathematics, are the locomotive by which the drug transportation and the targeting processes will be achieved under the light of the modern pharmacotherapy. They are considered as scientific tools that promote the understanding of physicochemical and thermotropic functionality and behavior of artificial cell membranes and structures like nanoparticulate systems. Therefore, this book focusses on new aspects of biophysics and thermodynamics as important elements for evaluating biomedical nanosystems, and it correlates their physicochemical, biophysical and thermodynamical behaviour with those of a living organism. In 2018, Prof. Demetzos was honored with an award by the Order of Sciences of the Academy of Athens for his scientific contribution in Pharmaceutical Nanotechnology.
Download or read book Nanomaterials and Nanochemistry written by C. Bréchignac and published by Springer Science & Business Media. This book was released on 2008-01-01 with total page 753 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is a brilliant book that covers the major aspects of nanomaterials production. It integrates the many and varied chemical, material and thermo-dynamical facets of production, offering readers a new and unique approach to the subject. The mechanical, optical, and magnetic characteristics of nanomaterials are also presented in detail. Nanomaterials are a fast developing field of research and this book serves as both a reference work for researchers and a textbook for graduate students.
Download or read book Production Handling and Characterization of Particulate Materials written by Henk G. Merkus and published by Springer. This book was released on 2015-11-26 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume presents most techniques and methods that have been developed by material scientists, chemists, chemical engineers and physicists for the commercial production of particulate materials, ranging from the millimeter to the nanometer scale. The scope includes the physical and chemical background, experimental optimization of equipment and procedures, as well as an outlook on future methods. The books addresses issues of industrial importance such as specifications, control parameter(s), control strategy, process models, energy consumption and discusses the various techniques in relation to potential applications. In addition to the production processes, all major unit operations and characterization methods are described in this book. It differs from other books which are devoted to a single technique or a single material. Contributors to this book are acknowledged experts in their field. The aim of the book is to facilitate comparison of the different unit operations leading to optimum equipment choices for the production, handling and storage of particulate materials. An advantage of this approach is that unit operations that are common in one field of application are made accessible to other fields. The overall focus is on industrial application and the book includes some concrete examples. The book is an essential resource for students or researchers who work in collaboration with manufacturing industries or who are planning to make the switch from academia to industry.
