Download or read book Processing Microstructure Mechanical Behavior and Deformation Mechanisms of Bulk Nanostructured Copper and Copper Alloys written by Haiming Wen and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Bulk nanostructured (NS) metals, with structural units falling in the nanometer range, have emerged as a new class of materials. However, fabrication of artifact-free bulk NS metals with relatively large sample size still poses a challenge, the mechanical behavior needs to be further improved to achieve better combination of strength and ductility, and the fundamental understanding requires to be enhanced of the relationship between processing, microstructure and mechanical behavior. This dissertation selected Cu and Cu alloys as model materials to study processing, microstructure, mechanical behavior and deformation mechanisms of bulk NS metals. Bulk NS Cu and Cu alloys were fabricated by equal channel angular pressing (ECAP), spark plasma sintering (SPS) of cryomilled powders, or by high-pressure torsion (HPT) of coarse-grained or cryomilled powders, in efforts to simultaneously achieve high strength and satisfactory ductility, and to deepen our fundamental understanding of the microstructure and deformation mechanisms that govern the mechanical behavior of bulk NS metals. The temperature at which ECAP is conducted was found to have significant effect on microstructure evolution and mechanical behavior of ultrafine-grained Cu processed by ECAP. A superior combination of strength and ductility was achieved when ECAP was performed at 523 K where discontinuous dynamic recrystallization induces a high fraction of equiaxed grains with a very low dislocation density. During SPS of cryomilled nanocrystalline (nc) Cu powders, the presence of very small amounts of O and N in the powders, which were introduced during cryomilling and handling, and the change of these impurities during SPS were demonstrated to significantly influence the densification response. A bulk NS Cu-Zn-Al alloy with ultrahigh strength was fabricated via SPS of cryomilled powders. The microstructure of the alloy was thoroughly characterized, and various strengthening contributions were quantified, including grain boundary, twin boundary, second-phase particle, dislocation and solid-solution strengthening, and the calculated overall strength achieved a reasonable agreement with the experimental strength. The twins in the cryomilled Cu-Zn-Al powders and sintered bulk samples were carefully investigated, in an effort to provide insight into the mechanisms governing the evolution of twins during SPS, including grain boundary migration, twin boundary migration, recrystallization and detwinning. HPT was applied to coarse-grained (CG) and nc Cu powders, with identical processing parameters. HPT of CG Cu powders resulted in exceptional grain refinement and increase in dislocation density, whereas significant grain growth, via grain rotation-induced grain coalescence, and decrease in dislocation density occurred during HPT of cryomilled nc Cu powders. Equilibrium structures were achieved under both conditions, with very similar stable grain sizes and dislocation densities, suggesting dynamic balances between deformation-induced grain refinement and grain growth, and between dislocation accumulation and dislocation annihilation.

Download or read book Advanced Mechanical Properties and Deformation Mechanisms of Bulk Nanostructured Materials written by Yong Hao Zhao and published by Trans Tech Publications Ltd. This book was released on 2011-05-17 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special topic volume with invited peer reviewed papers only

Download or read book Nanostructured Metals and Alloys written by S H Whang and published by Elsevier. This book was released on 2011-03-22 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tensile strength, fatigue strength and ductility are important properties of nanostructured metallic materials, which make them suitable for use in applications where strength or strength-to-weight ratios are important. Nanostructured metals and alloys reviews the latest technologies used for production of these materials, as well as recent advances in research into their structure and mechanical properties.One of the most important issues facing nanostructured metals and alloys is how to produce them. Part one describes the different methods used to process bulk nanostructured metals and alloys, including chapters on severe plastic deformation, mechanical alloying and electrodeposition among others. Part two concentrates on the microstructure and properties of nanostructured metals, with chapters studying deformation structures such as twins, microstructure of ferrous alloys by equal channel angular processing, and characteristic structures of nanostructured metals prepared by plastic deformation. In part three, the mechanical properties of nanostructured metals and alloys are discussed, with chapters on such topics as strengthening mechanisms, nanostructured metals based on molecular dynamics computer simulations, and surface deformation. Part four focuses on existing and developing applications of nanostructured metals and alloys, covering topics such as nanostructured steel for automotives, steel sheet and nanostructured coatings by spraying.With its distinguished editor and international team of contributors, Nanostructured metals and alloys is a standard reference for manufacturers of metal components, as well as those with an academic research interest in metals and materials with enhanced properties.

Download or read book Ductility of Bulk Nanostructured Materials written by Yonghao Zhao and published by Trans Tech Publications Ltd. This book was released on 2009-11-19 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters BCI (WoS). Strength and ductility are two of the most important mechanical properties of structural materials, but this usually involves a trade-off, because of the fundamental inverse proportionality of these two features. Since the 1980s, bulk nanostructured materials have emerged as a new class of material having unusual structures and, as a result, have attracted increasing attention. Unfortunately, most bulk nanostructured materials still do not evade the strength-ductility trade-off dilemma, and usually have very poor ductility. The poor ductility of bulk nanostructured materials has indeed become a seemingly insurmountable obstacle to the widespread technological application of structural bulk nanostructured materials.

Download or read book Investigation of the Relationship Between Mechanical Properties and Microstructure of Nanocrystalline Copper written by Carl Joseph Youngdahl and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocrystalline copper samples were produced and analyzed with the aim of elucidating how very small grain sizes affect mechanical properties of crystalline materials. The mechanical properties and microstructure of the material were investigated. Important mechanical properties explored include yield strength, hardness, and ductility. Such microstructural parameters as grain size, grain morphology, grain size distribution, and bulk density were also evaluated. Grain size and strength in conventional metals are related by the Hall-Petch relation, which is expected to lose relevance at low grain sizes. At average grain sizes of 10--100 nm, previous researchers often noted deviations from Hall-Petch predictions of strength. In contrast, samples in the same grain size regime tested in compression were found to adhere to the relation for both yield strength and hardness in this study. At the lowest grain sizes, a mild reversal in the trend of the Hall-Petch relation may be visible, suggesting a possible shift in the dominant deformation mechanism. In addition, Transmission Electron Microscopy (TEM) was used to observe deformation of nanocrystalline copper in situ. Grains of 40 nm and perhaps smaller sizes appear to deform by dislocation motion, though other mechanisms may also be active. Extensive examinations of loose powder were also performed via TEM. Wide grain size distributions were likely to have arisen during consolidation, because uncompacted powders have a more uniform and smaller distribution. Processing of samples was controlled to achieve a variety of grain morphologies for property evaluation.

Download or read book Nanoscale Materials and Modeling relations Among Processing Microstructure and Mechanical Properties written by Materials Research Society. Meeting and published by . This book was released on 2004 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 55 papers in this collection from the April 2004 symposium study processing methods for nanostructured materials, internal stress and the physics of strengthening mechanisms at the nanoscale, and the mechanical properties of nanoscale materials. Each of the six parts presents experimental contributions first, followed by papers describing related modeling and simulation. Topics include the effect of gold films electrodeposited on nickel substrates, microstructural refinement in copper solid solutions by machining, the synthesis of zeolite as ordered multi-crystal arrays, the elevated temperature mechanical properties of devitrified metallic glass, and improved fracture toughness in advanced nanocrystalline ceramic composites. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).

Download or read book Severe Plastic Deformation written by Burhanettin Altan and published by Nova Publishers. This book was released on 2006 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been already well established that the nanostructured materials (materials with a grain size of 100mm or less) is the future materials. Nanostructured materials possess properties superior to those of conventional, coarse grained materials. Hence designing potentially cost efficient and environmentally friendly products with better performance is a possibility. Among others, nanostructured materials exhibit increased strength, hardness and ductility and provide an opportunity for superplastic forming. When all the procedures in use for the production of nanostructured materials are examined, only severe plastic deformation (SPD) processes exhibit a potential for producing relatively large samples suitable for industrial applications. In this monograph, the state-of-the-art on severe plastic deformation methods is presented in one volume. The monograph is organised into eight chapters, each of which contains papers on different aspect of severe plastic deformation methods prepared by the experts in this field. The topics covered in the monograph are structure formation, phase transformation, superplasticity, mechanical properties of nanostructured materials, electronic and magnetic properties of nanostructured materials, deformation analysis, novel SPD methods, commercialisation of ECAE method.

Download or read book Materials Processing Handbook written by Joanna R. Groza and published by CRC Press. This book was released on 2007-03-28 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of materials science and engineering is rapidly evolving into a science of its own. While traditional literature in this area often concentrates primarily on property and structure, the Materials Processing Handbook provides a much needed examination from the materials processing perspective. This unique focus reflects the changing comple

Download or read book Copper Alloys written by Luca Collini and published by BoD – Books on Demand. This book was released on 2012-03-07 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Copper has been used for thousands of years. In the centuries, both handicraft and industry have taken advantage of its easy castability and remarkable ductility combined with good mechanical and corrosion resistance. Although its mechanical properties are now well known, the simple f.c.c. structure still makes copper a model material for basic studies of deformation and damage mechanism in metals. On the other hand, its increasing use in many industrial sectors stimulates the development of high-performance and high-efficiency copper-based alloys. After an introduction to classification and casting, this book presents modern techniques and trends in processing copper alloys, such as the developing of lead-free alloys and the role of severe plastic deformation in improving its tensile and fatigue strength. Finally, in a specific section, archaeometallurgy techniques are applied to ancient copper alloys. The book is addressed to engineering professionals, manufacturers and materials scientists.

Download or read book Bulk Nanostructured Materials written by Michael J. Zehetbauer and published by John Wiley & Sons. This book was released on 2009-06-10 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: The processing and mechanical behaviour of bulk nanostructured materials are one of the most interesting new fields of research on advanced materials systems. Many nanocrystalline materials possess very high strength with still good ductility, and exhibit high values of fatigue resistance and fracture toughness. There has been continuing interest in these nanomaterials for use in structural and biomedical applications, and this has led to a large number of research programs worldwide. This book focuses on the processing techniques, microstructures, mechanical and physical properties, and applications of bulk nanostructured materials, as well as related fundamental issues. Only since recently can such bulk nanostructured materials be produced in large bulk dimensions, which opens the door to their commercial applications.

Download or read book Comprehensive Materials Processing written by and published by Newnes. This book was released on 2014-04-07 with total page 5485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Materials Processing, Thirteen Volume Set provides students and professionals with a one-stop resource consolidating and enhancing the literature of the materials processing and manufacturing universe. It provides authoritative analysis of all processes, technologies, and techniques for converting industrial materials from a raw state into finished parts or products. Assisting scientists and engineers in the selection, design, and use of materials, whether in the lab or in industry, it matches the adaptive complexity of emergent materials and processing technologies. Extensive traditional article-level academic discussion of core theories and applications is supplemented by applied case studies and advanced multimedia features. Coverage encompasses the general categories of solidification, powder, deposition, and deformation processing, and includes discussion on plant and tool design, analysis and characterization of processing techniques, high-temperatures studies, and the influence of process scale on component characteristics and behavior. Authored and reviewed by world-class academic and industrial specialists in each subject field Practical tools such as integrated case studies, user-defined process schemata, and multimedia modeling and functionality Maximizes research efficiency by collating the most important and established information in one place with integrated applets linking to relevant outside sources

Download or read book Severe Plastic Deformation written by Ghader Faraji and published by Elsevier. This book was released on 2018-07-14 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Severe Plastic Deformation: Methods, Processing and Properties examines all severe plastic deformation techniques developed over the past two decades, exploring the appropriate severe plastic deformation method for a particular case. The book offers an overview of these methods, introduces ultrafine-grained and nano-grained metals and methods for various bulk, sheet, tubular and large size samples, reviews effective parameters to make a severe plastic deformation method better, from property (mechanical) and processing (cost, time, load, etc.) viewpoints, discusses mechanical, physical and chemical properties of UFG and NS metals, and concludes with various applications for these methods. Over the last several decades, a large number of severe plastic deformation methods have been developed for processing a wide array of metals for superior properties, making this a timely resource. Collects all severe plastic deformation methods in a unique reference Compares severe plastic deformation methods from several viewpoints, including processing and final property Classifies severe plastic deformation methods based on the sample shape and mechanics, as well as the properties achieved in the processed metal Introduces ultrafine-grained and nano-grained metals and methods for various bulk, sheet, tubular and large size samples

Download or read book Comprehensive Materials Finishing written by M.S.J. Hashmi and published by Elsevier. This book was released on 2016-08-29 with total page 1467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finish Manufacturing Processes are those final stage processing techniques which are deployed to bring a product to readiness for marketing and putting in service. Over recent decades a number of finish manufacturing processes have been newly developed by researchers and technologists. Many of these developments have been reported and illustrated in existing literature in a piecemeal manner or in relation only to specific applications. For the first time, Comprehensive Materials Finishing, Three Volume Set integrates a wide body of this knowledge and understanding into a single, comprehensive work. Containing a mixture of review articles, case studies and research findings resulting from R & D activities in industrial and academic domains, this reference work focuses on how some finish manufacturing processes are advantageous for a broad range of technologies. These include applicability, energy and technological costs as well as practicability of implementation. The work covers a wide range of materials such as ferrous, non-ferrous and polymeric materials. There are three main distinct types of finishing processes: Surface Treatment by which the properties of the material are modified without generally changing the physical dimensions of the surface; Finish Machining Processes by which a small layer of material is removed from the surface by various machining processes to render improved surface characteristics; and Surface Coating Processes by which the surface properties are improved by adding fine layer(s) of materials with superior surface characteristics. Each of these primary finishing processes is presented in its own volume for ease of use, making Comprehensive Materials Finishing an essential reference source for researchers and professionals at all career stages in academia and industry. Provides an interdisciplinary focus, allowing readers to become familiar with the broad range of uses for materials finishing Brings together all known research in materials finishing in a single reference for the first time Includes case studies that illustrate theory and show how it is applied in practice

Download or read book Self diffusion and Impurity Diffusion in Pure Metals written by Gerhard Neumann and published by Elsevier. This book was released on 2011-08-19 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion in metals is an important phenomenon, which has many applications, for example in all kinds of steel and aluminum production, and in alloy formation (technical applications e.g. in superconductivity and semiconductor science). In this book the data on diffusion in metals are shown, both in graphs and in equations.Reliable data on diffusion in metals are required by researchers who try to make sense of results from all kinds of metallurgical experiments, and they are equally needed by theorists and computer modelers. The previous compilation dates from 1990, and measurements relying on the electron microprobe and the recent Rutherford backscattering technique were hardly taken into account there.This reference book, containing all results on self-diffusion and impurity diffusion in pure metals with an indication of their reliability, will be useful to everyone in this field for the theory, fundamental research and industrial applications covered.• Up-to-date and complete (including EPMA and RBS investigations)• Indication of reliability of the measurements• Reassessment of many early results• Data can easily be extracted from Tables and Graphs

Download or read book An Investigation of Bulk Nanocrystalline Copper Fabricated Via Severe Plastic Deformation and Nanoparticle Consolidation written by Mohammed Haouaoui and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrafine grained (UFG) and nanocrystalline materials have attracted considerable interest because of their unique mechanical properties as compared with coarse grained conventional materials. The fabrication of relatively large amounts of these materials still remains a challenge, and a thorough understanding of the relationship between microstructure and mechanical properties is lacking. The objective of this study was to investigate the mechanical properties of UFG and nanocrystalline copper obtained respectively by a top down approach of severe plastic deformation of wrought copper and a bottom up approach of consolidation of copper nanoparticles using equal channel angular extrusion (ECAE). A critical assessment and correlation of the mechanical behavior of ECAE processed materials to the microstructure was established through the determination of the effect of strain level and strain path on the evolution of strength, ductility and yield anisotropy in UFG oxygen free high conductivity copper in correlation with grain size, grain morphology and texture. ECAE was shown to be a viable method to fabricate relatively large nanocrystalline consolidates with excellent mechanical properties. Tensile strengths as high as 790 MPa and fracture strain of 7 % were achieved for consolidated 130nm copper powder. The effects of extrusion route, number of passes and extrusion rate on consolidation performance were evaluated. The relatively large strain observed was attributed to the bimodal grain size distribution and accommodation by large grains. The formation of bimodal grain size distribution also explains the simultaneous increase in strength and ductility of ECAE processed wrought Cu with number of passes. Texture alone cannot explain the mechanical anisotropy in UFG wrought copper but we showed that grain morphology has a strong impact and competes with texture and grain refinement in controlling the resulting yield strength. Tension-compression asymmetry was observed in UFG wrought copper. This asymmetry is not always in favor of compression as reported in literature, and is also influenced by grain morphology through the interaction of dislocations with grain boundaries. Different prestrains in tension and compression should be experimented to have a better understanding of the encountered anisotropy in Bauschinger parameter in relation with the observed tension-compression asymmetry.

Download or read book Bulk Nanostructured Materials written by Ruslan Z. Valiev and published by John Wiley & Sons. This book was released on 2013-09-17 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the most recent results in the area of bulk nanostructured materials and new trends in their severe plastic deformation (SPD) processing, where these techniques are now emerging from the domain of laboratory-scale research into the commercial production of various bulk nanomaterials. Special emphasis is placed on an analysis of the effect of nanostructures in materials fabricated by SPD on mechanical properties (strength and ductility, fatigue strength and life, superplasticity) and functional behavior (shape memory effects, magnetic and electric properties), as well as the numerous examples of their innovative applications. There is a high innovation potential for industrial applications of bulk nanomaterials for structural use (materials with extreme strength) as well as for functional applications such as nanomagnets, materials for hydrogen storage, thermoelectric materials, superconductors, catalysts, and biomedical implants.

Download or read book Nanostructured Materials by High Pressure Severe Plastic Deformation written by Yuntian T. Zhu and published by Springer Science & Business Media. This book was released on 2006-01-20 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, it was reported that nanostructured materials processed under high pressure by HPT and ECAP have an extraordinary combination of both high strength and high ductility, which are two desirable, but rarely co-existing properties. These findings indicate that high-pressure is a critical factor that can be employed to process nanostructured materials with superior mechanical, and possibly also physical, properties. It is the objective of this workshop to review our current knowledge, identify issues for future research, and discuss future directions on the processing and properties of nanostructured materials via SPD techniques, with a special emphasis on high-pressure effects. The 42 peer-reviewed papers in this book cover areas of high pressure effect on the nanostructure and properties of SPD-processed materials, fundamentals of nanostructured materials, development of high-pressure SPD technologies for commercializations, recent advances of SPD technologies as well as applications and future markets of SPD-processed nanostructured materials.