Download or read book Microstructural Evolution of Commercial Purity Ti and Superplasticity of Ti 6Al 4V Alloy Processed by Equal Channel Angular Extrusion written by and published by . This book was released on 2006 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project focused on deformation processing, microstructural development, and mechanical properties of Ti and Ti-6Al-4V alloys. Specific tasks included: (1) Study superplastic deformation of a Ti-6Al-4V alloy that have been processed by equal channel angular extrusion and relate the deformation mechanism to the enhancement of superplasticity, and (2) Examine the effect of strain path for Ti fabricated by equal channel angular extrusion and uniaxial compression, with a special focus on the improved mechanical properties of the deformed Ti. As a part of the report, two papers were published in Materials Science and Engineering A (vol. A410-411, 2005, 156-159) and Metallurgical and Materials Transactions A (vol.37, 2006, 381-391). The work was begun under AOARD 034023, "Microstructure development of ultrafine grained Ti and superplasticity of Ti-6Al-4V alloy." Most of that effort was devoted to Ti-6Al-4V alloy. Much progress has been made over the more than two years of effort. We propose to complete our studies by studying, in detail, deformation mechanisms for the enhanced superplasticity in the ultrafine grained Ti-6Al-4V alloy with a special focus on the role of non-equilibrium grain boundaries.
Download or read book Handbook of Mechanical Nanostructuring written by Mahmood Aliofkhazraei and published by John Wiley & Sons. This book was released on 2015-02-10 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing in-depth information on how to obtain high-performance materials by controlling their nanostructures, this ready reference covers both the bottom-up and the top-down approaches to the synthesis and processing of nanostructured materials. The focus is on advanced methods of mechanical nanostructuring such as severe plastic deformation, including high pressure torsion, equal channel angular processing, cyclic extrusion compression, accumulative roll bonding, and surface mechanical attrition treatment. As such, the contents are inherently application-oriented, with the methods presented able to be easily integrated into existing production processes. In addition, the structure-property relationships and ways of influencing the nanostructure in order to exhibit a desired functionality are reviewed in detail. The whole is rounded off by a look at future directions, followed by an overview of applications in various fields of structural and mechanical engineering. With its solutions for successful processing of complex-shaped workpieces and large-scale specimens with desired properties, this is an indispensable tool for purposeful materials design.
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 Microstructural Refinement of Alpha brass and Ti 6Al 4V by Equal Channel Angular Extrusion Processing written by Byungin Jung and published by . This book was released on 2006 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superplastic Forming Diffusion Bonding Technology of Titanium Alloys written by Zhiqiang Li and published by Springer Nature. This book was released on 2023-10-26 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive illustration to the superplastic forming/diffusion bonding (SPF/DB) technology developed over decades of research on titanium alloys, process modeling, and its application. SPF/DB technology plays key roles in building aviation components with complicated structures, with highly beneficial effects when well designed. With the ever-increasing demand on components with multiple layers, there is an urgent need for an updated assessment of traditional and modern SPF/DB processing methods. Success critically depends on making the most practical and effective choice of SPF/DB method for a given application. The book introduces titanium and titanium alloys, SPF/DB processing and its modeling, and applications for building typical single or multiple layer(s) structures. Particular attention is paid to illustrating the microstructure evolution during SPF/DB processes. The information for making technical decisions about optimal choice of measurement and evaluation methods is also given in the book. Each chapter follows a focused and pragmatic format. Fully illustrated throughout, the book presents the state of the art in SPF/DB technology in a manner that makes it useful for engineers to improve the established forming processes and quality of components. This book is an essential reading material for industrial practitioners, academic researchers and postgraduates.
Download or read book Severe Plastic Deformation Techniques written by Marcello Cabibbo and published by BoD – Books on Demand. This book was released on 2017-08-09 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Grain size is recognized as a key microstructural factor affecting mechanical and, to some extent, physical properties of metals and metallic materials. For this reason, all the means designed to control and modify the grain size are considered a proper way to design and tailor metallic materials with desired properties. In this sense, microstructure refinement through severe plastic deformation (SPD) techniques can be considered a key method for this purpose. A typical SPD process is currently defined as any method of metal forming under extensive hydrostatic pressure intended to impose a very high strain on a bulk solid without involving any significant change in the overall dimensions and having the ability to produce exceptional grain refinement. What makes SPD processing techniques so popular and attractive is the possibility of using them to enhance the strength behavior of conventional metallic materials by a factor of up to eight for pure metals such as copper and by some 30-50% for alloys. Despite the impressive property improvement achievable with SPD techniques, their uptake by industry has been rather sluggish. This book intends to give a panorama of the typical SPD techniques intended to optimize the mechanical and physical properties of metals through a significant grain size reduction process. Modeling for this purpose is also presented.
Download or read book Development of Ultra Fine Grained Ti and Ti 6Al 4V Alloy by Equal Channel Angular Extrusion written by and published by . This book was released on 2003 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers efforts to use equal-channel angular extrusion (ECAE) to produce a fine-grained structure in Ti and Ti-6Al-4V. Both materials were successfully produced. Details of processing and resulting microstructures (phase morphology, grain size, texture, dislocation and twin substructures) are presented and discussed. Ti alloys are a mixture of hexagonal-close-packed and body-centered-cubic crystal structures. Plastic deformation is accommodated by a mixture of dislocation motion and twinning.
Download or read book Modern Manufacturing Engineering written by J. Paulo Davim and published by Springer. This book was released on 2015-06-19 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers recent research and trends in Manufacturing Engineering. The chapters emphasize different aspects of the transformation from materials to products. It provides the reader with fundamental materials treatments and the integration of processes. Concepts such as green and lean manufacturing are also covered in this book.
Download or read book Effect of Alloying Chemistry and Microstructure on Equal Channel Angular Extrusion Processing and Superplasticity of Titanium Alloys written by Vadim V. Protasov and published by . This book was released on 2006 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Superplasticity in Advanced Materials written by Richard I. Todd and published by . This book was released on 2004 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superplastic forming (SPF) has come a long way from its relatively recent history of being of interest only to the aerospace and aeronautical industries, and has made rapid inroads into applications in the automotive, rail, architectural, sports, dental and entertainment sectors. This book comprises 82 papers which describe in detail the latest developments in the field. All aspects of the subject are covered, ranging from the atomistic simulation of grain-boundary sliding to the industrial-scale application of superplasticity and of diffusion bonding. This volume therefore represents an invaluable guide to the state-of-the-art in this field.
Download or read book Electron Backscatter Diffraction in Materials Science written by Adam J. Schwartz and published by Springer Science & Business Media. This book was released on 2010-03-11 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron backscatter diffraction is a very powerful and relatively new materials characterization technique aimed at the determination of crystallographic texture, grain boundary character distributions, lattice strain, phase identification, and much more. The purpose of this book is to provide the fundamental basis for electron backscatter diffraction in materials science, the current state of both hardware and software, and illustrative examples of the applications of electron backscatter diffraction to a wide-range of materials including undeformed and deformed metals and alloys, ceramics, and superconductors. The text has been substantially revised from the first edition, and the authors have kept the format as close as possible to the first edition text. The new developments covered in this book include a more comphrensive coverage of the fundamentals not covered in the first edition or other books in the field, the advances in hardware and software since the first edition was published, and current examples of application of electron backscatter diffraction to solve challenging problems in materials science and condensed-matter physics.
Download or read book Microstructural Evolution and the Thermo mechanical Behavior of UFG Ti Processed Via Equal Channel Angular Pressing written by Christopher Sean Meredith and published by . This book was released on 2011 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, titanium (commercially pure, grade 1) was processed by equal channel angular pressing (ECAP) for multiple passes. ECAP is a method of applying severe plastic deformation, without changing the overall dimensions. A billet material is pressed through the channel and forced to deform around the 90° turn in the channel, and this deformation converts coarse grained materials into ultrafine grained (UFG) ones, and introduces a high percentage of high angle grain boundaries. These are the main reasons for the improvement of the mechanical properties that have been observed. The uniform microstructure from the as-received condition, goes from long, coarse bands with some grains relatively undeformed after a single pass to mostly uniform UFG after four passes. The material deforms via both twinning and slip during the first pass, and almost exclusively by slip for passes beyond one. At all numbers of passes, the more coarse grains are refined by continuous dynamic recrystallization, whereby the accumulation of dislocations cause crystal rotation which subsequently form low angle grain boundaries and then fully enclosed high angle grain boundaries. These high angle grain boundaries are new ultrafine grains. Furthermore, the mechanical behavior was measured under uniaxial compression. Most of the strength increase occurs after the first pass, with incremental increases after that, but by four passes of ECAP the yield point is about three times greater than the as-received Ti. The strain rate sensitivity generally decreases as the number of passes increases, but increases with temperature. When loading in different directions, it was determined that under all conditions, the highest to lowest yield and flow stresses were in the y-, z- and x-directions, respectively. Finally, during dynamic testing in different directions, the samples failed via shear banding, which depended on the loading direction and temperature. The loading directions from the most to least total strain before the initiation of macroscopic failure by shear banding were in the x-, y- and z-directions, respectively.
Download or read book Microstructural and Constitutive Behavior of Superplastic Titanium Alloy Ti 6Al 4V written by Craig Harold Johnson and published by . This book was released on 1994 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructural Evolution during Forging of Ti 6Al 4V Alloy written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microstructure Development in 6000 Series Aluminum Alloys Processed Via Equal Channel Angular Extrusion written by William Heffner and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Industry standard 6061 and 6063 Aluminum alloys were processed by equal channel angular extrusion (ECAE) at room temperature using a Bc route with a constant feed rate of 0.25 mm/s through a die angle of 90° between the die channels. The influence of ECAE processing on the evolution of the microstructure, microtexture and microhardness in the material was studied using orientation imaging microscopy (OIM), X-ray diffractometry, and Vickers microhardness testing. Detailed analysis was carried out on samples of the as-received, one, two, four and eight pass conditions.
Download or read book Microstructural Evolution of Friction Stir Processed Ti 6Al 4V written by Paul Andrew Pavka and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Friction stir welding has been developed over the past ten years to permit joining of high strength alloys that cannot be fusion welded. More recently friction stir processing (FSP) has been shown to alter the surface microstructure of a material by essentially in situ thermo mechanical processing. In this study we have used FSP to alter the surface microstructure of Ti-6Al-4V. In all trials, the friction stir processing (FSP) applied to the surface of cast +H.I.P. slabs has resulted in changing the coarse lamellae to small equiaxed [alpha] grains that are about 1 in diameter. This process leaves the coarse lamellar microstructure in the bulk of the material. These findings are believed to produce a microstructure that will have better fatigue strength than what was previously available from the cast + H.I.P. coarse microstructure. Orientation imaging microscopy (OIM) of the fine-grained, equiaxed process zone has shown that there is no preferred grain orientation. A new technique for locally measuring yield strength using small, in-situ compressive cylinders (pillars) has been used to determine the strength change between the fine grain and as-cast structure. Pillars made from focused ion beam milling (FIB) have demonstrated that the fine-grained stirred material is about 30% stronger than the as-cast material. Definition of the mechanism that controls the conversion from the lamellar structure to the equiaxed structure is still being developed, but several observations suggest that the -transus has not been exceeded. More work is being done to verify the fatigue strength of the new microstructure, and to develop a better understanding of the mechanism that controls the conversion process. This work is ongoing but the microstructure changes associated with FSP are described in here.
