Download or read book Phase transformations in transage alpha beta titanium alloys written by Anthony Ifeanyi Paul Nwobu and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Transformations written by Srikumar Banerjee and published by Elsevier. This book was released on 2010-05-31 with total page 837 pages. Available in PDF, EPUB and Kindle. Book excerpt: The terms phase transitions and phase transformations are often used in an interchangeable manner in the metallurgical literature. In Phase Transformations, transformations driven by pressure changes, radiation and deformation and those occurring in nanoscale multilayers are brought to the fore. Order-disorder transformations, many of which constitute very good examples of continuous transformations, are dealt with in a comprehensive manner. Almost all types of phase transformations and reactions that are commonly encountered in inorganic materials are covered and the underlying thermodynamic, kinetic and crystallographic aspects elucidated. - Shows readers the advancements in the field - due to enhanced computing power and superior experimental capability - Drawing upon the background and the research experience of the authors, bringing together a wealth of experience - Written essentially from a physical metallurgists view point
Download or read book The Morphologies of the beta alpha Phase Transformations in Highly Alloyed High Strength Titanium Alloys written by Muhamad Azizi Mat Yajid and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Alloying Elements in Titanium written by D. J. Maykuth and published by . This book was released on 1961 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grain boundary Parameters Controlled Allotriomorphic Phase Transformations in Beta processed Titanium Alloys written by Vikas Dixit and published by . This book was released on 2013 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Allotriomorphic or grain-boundary alpha (GBA) is an unavoidable and important microstructural feature of the diffusional phase transformations in beta-processed titanium alloys. This phase has a negative influence on various mechanical properties, such as high cycle fatigue, fracture toughness, ductility etc. and has a profound influence on the overall microstructural evolution. In the present work, the evolution of GBA has been in explored relative to the grain-boundary parameters namely, misorientation angle and axis, and the GB plane. While the misorientation angle and axis relate to the crystallography of adjacent crystals and can easily be determined using diffraction based techniques, an accurate determination of the local crystallographic orientation of the GB plane is difficult because of its three-dimensional nature. To address this issue, two independent experimental approaches have been developed and validated by utilizing a combination of dual beam focused ion beam (FIB), SEM and electron back-scattered diffraction (EBSD) methods. Both these approaches considerably simplify the problem because of a relatively easier experimental set-up and a versatile methodology. The crystallographic variant selection and morphology of GBA have been subsequently evaluated relative to the quantified GB parameters. Results indicate that in alpha/beta- and beta-titanium alloys, the crystallographic variant selection and GB parameters control the evolution of the allotriomorphic alpha phase. In particular, misorientation angle/ axis parameters control the early precipitation of GBA. The grain-boundaries of those adjacent beta-grains that produce nearly parallel 111 and/or 101 poles are the preferred sites for the early nucleation of GBA. In addition, these closely related poles significantly influence the crystallographic variant selection criterion in a majority of cases and contribute to a considerable short-listing of the allowed variants of GBA. The morphology of GBA is primarily controlled by the inclination of the GB plane relative to the selected crystallographic variant of the Burgers-OR at grain-boundaries. In beta-titanium alloys, continuous GBA precipitates are produced when the GB plane orients nearly perpendicular to the invariant line of the contributing Burgers-OR. In case of alpha/beta-titanium alloys, the thickening of GBA is higher when the GB plane orients close to the broad-face or the habit plane of the Burgers-OR. It has been proposed for the first time that the crystallographic and morphological aspects of GBA and adjacent Widmanstätten alpha are interrelated and primarily dictated by the GB parameters. Specifically, once a particular crystallographic variant of GBA is chosen by a set of criterion, the crystallographic and morphological nature of adjacent Widmanstätten alpha is also predicted. The resulting Widmanstätten alpha morphology in combination with the nature of the GB parameters would control the growth (continuous or discrete) of GBA. Finally, transmission electron microscopy studies have revealed a variation in the interfacial structure between GBA and the adjacent beta grain, different from previously known well-defined interfacial structure between Widmanstätten alpha and the parent beta phase. The faceting of the interface as well as presence of new sets of misfit dislocations have been observed in this work.
Download or read book Titanium written by Matthew J. Donachie and published by ASM International. This book was released on 2000 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed to support the need of engineering, management, and other professionals for information on titanium by providing an overview of the major topics, this book provides a concise summary of the most useful information required to understand titanium and its alloys. The author provides a review of the significant features of the metallurgy and application of titanium and its alloys. All technical aspects of the use of titanium are covered, with sufficient metals property data for most users. Because of its unique density, corrosion resistance, and relative strength advantages over competing materials such as aluminum, steels, and superalloys, titanium has found a niche in many industries. Much of this use has occurred through military research, and subsequent applications in aircraft, of gas turbine engines, although more recent use features replacement joints, golf clubs, and bicycles.Contents include: A primer on titanium and its alloys, Introduction to selection of titanium alloys, Understanding titanium's metallurgy and mill products, Forging and forming, Castings, Powder metallurgy, Heat treating, Joining technology and practice, Machining, Cleaning and finishing, Structure/processing/property relationships, Corrosion resistance, Advanced alloys and future directions, Appendices: Summary table of titanium alloys, Titanium alloy datasheets, Cross-reference to titanium alloys, Listing of selected specification and standardization organizations, Selected manufacturers, suppliers, services, Corrosion data, Machining data.
Download or read book Fundamental Studies of Beta Phase Decomposition Modes in Titanium Alloys written by H. I. Aaronson and published by . This book was released on 1985 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: These studies on diffusional phase transformations in titanium and related alloy systems are intended to develop further the scientific base needed to design alloys based upon these transformations which may exhibit significantly improved combinations of mechanical properties. Kinetics of beta yields alpha sub m massive transformation were compared with those of grain boundary proeutectoid alpha precipitation in Ti-Ag and Ti-Co alloys, using measured or calculated nucleation and growth kinetics data and Cahn analysis of overall transformation kinetics of grain boundary nucleated reactions, successfully explained presence of massive transformation only in Ti-Ag and alpha allotriomorphs only in Ti-Co. New explanation developed, on thermodynamic grounds, for replacement of 'normal' proeutectoid alpha plates with a well-formed 'black plates' alpha + lower reaction temperatures. Bainite nodules in hypereutectoid Ti-Cr and in hypoeutectoid Ti-Co and Ti-Fe were found to exhibit misfit dislocation and ledge structures. Nodules in Ti-Cr grew at approximately volume diffusion-controlled rates; but reanalysis is now needed in terms of ledge mechanism. Eutectoid alpha is often found to differ slightly in orientation from adjacent proeutectoid aplha plates.
Download or read book A Study of the beta to alpha Phase Transformation in Ti 25 35 Al Alloys written by Uwe Pilchowski and published by . This book was released on 1999 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of the Phase Transformations in the Metastable Beta Titanium Alloys Ti 13V 11Cr 3A1 Ti 13V 11Cr and Ti 15Cr and the Microstructural mechanical Properties Relationship in the Ti 13V 11Cr 3A1 Alloy written by G. Hari Narayanan and published by . This book was released on 1971 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Transformations in Metals and Alloys Third Edition Revised Reprint written by David A. Porter and published by CRC Press. This book was released on 1992-09-10 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the decade since the first edition of this popular text was published, the metallurgical field has undergone rapid developments in many sectors. Nonetheless, the underlying principles governing these developments remain the same. A textbook that presents these advances within the context of the fundamentals is greatly needed by instructors in the field Phase Transformations in Metals and Alloys, Second Edition maintains the simplicity that undergraduate instructors and students have come to appreciate while updating and expanding coverage of recently developed methods and materials. The book is effectively divided into two parts. The beginning chapters contain the background material necessary for understanding phase transformations - thermodynamics, kinetics, diffusion theory and the structure and properties of interfaces. The following chapters deal with specific transformations - solidification, diffusional transformation in solids and diffusionless transformation. Case studies of engineering alloys are incorporated to provide a link between theory and practice. New additions include an extended list of further reading at the end of each chapter and a section containing complete solutions to all exercises in the book Designed for final year undergraduate and postgraduate students of metallurgy, materials science, or engineering materials, this is an ideal textbook for both students and instructors.
Download or read book The Range of the Occurrence of alpha Phase in near beta Titanium Alloys 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 Phase Transformations in Metals and Alloys Revised Reprint written by David A. Porter and published by CRC Press. This book was released on 2009-02-10 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Expanded and revised to cover developments in the field over the past 17 years, and now reprinted to correct errors in the prior printing, Phase Transformation in Metals and Alloys, Third Edition provides information and examples that better illustrate the engineering relevance of this topic. It supplies a comprehensive overview of specific types o
Download or read book Modelling of Phase Transformations and Mechanical Properties of Titanium Alloys During Processing written by Zhanli Guo and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Transformations in Two Phase Titanium Alloys written by E. V. Polyak and published by . This book was released on 1973 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: An electron microscope was used to study the kinetics of disintegration of metastable martensitic alpha prime- and beta--phases of two-phase titanium alloys. The results obtained established the connection between structural transformations and the mechanical properties of the alloys. The alpha prime-phase and kinetics of its disintegration were studied using a VT14 alloy following its quenching in water from the beta-region at 1000 degrees and subsequent aging in the 550-750 degree temperature interval.
Download or read book Effect of Omega Phase on Selected Properties of Beta III Titanium Alloy written by F. H. Froes and published by . This book was released on 1975 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: The program objective is to increase the elastic modulus, or modulus-density ratio, of heat treatable beta titanium alloys, while maintaining adequate levels of strength, ductility and toughness by suitable thermomechanical processing and thermal treatments. Material from production and laboratory heats, centering on the Beta III alloy (Ti-11.5Mo-6Zr-4.5Sn), was evaluated by correlating microstructural features with mechanical properties for material subjected to various thermal-mechanical process sequences and thermal treatments. The results show that the elastic modulus can be increased by (1) an increase in the proportion of the high modulus alpha phase, (2) judicious increase in the amount of omega, and (3) an increase in the molybdenum content of the beta phase. Transformation kinetics within the omega formation temperature range and the nature of the omega to alpha transformation are discussed.
Download or read book Phase Transformations in Metastable beta Titanium Alloy TIMET LCB Ti 6 8Mo 4 5Fe 1 5Al written by Sébastien Azimzadeh and published by . This book was released on 1995 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development of Textures and Microstructures in Alpha beta Titanium Alloys written by Dhriti Bhattacharyya and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The relationship between the texture and the microstructure of both beta processed and alpha/beta processed Ti alloys has been examined in this study. In the beta-processed microstructures, it has been shown that two sets of alpha colonies sharing a common 0001 plane and rotated by 10.5° from each other may have growth directions which have very large angles of about 80.7° between them. Moreover, it was observed that alpha laths growing from certain prior beta grain boundaries sometimes shared common basal planes. In some special cases, the alpha laths growing into two different prior beta grains from the grain boundary between them had almost exactly the same orientation, although they had vastly different growth directions. Additionally, there were some cases in which alpha laths growing into different prior beta grains not only had the same crystallographic orientation, but also had the same growth direction. Scanning Electron Microscopy (SEM), Orientation Imaging Microscopy (OIM) and Transmission Electron Microscopy (TEM) have been used to investigate these phenomena and the existing theories of growth directions have been used in conjunction with the results obtained to explain them. In alpha/beta-processed alloys, the phenomenon of globularization of alpha laths breaks down the beta-processed microstructure and modifies the texture of these alloys. Samples of Ti-6Al-4V having colony and basketweave microstructures were hot deformed in the high alpha/beta temperature range and their microstructure and microtexture were examined by the use of SEM and OIM. It is shown that the samples which had a colony microstructure had greater "clustering" of grains with similar orientations than those having a basketweave microstructure. The mode of transformation on heating from the alpha to the beta phase was investigated by measuring the texture of both phases at different temperatures, in situ, using the HIPPO instrument at the Los Alamos Neutron Science Center. A comparison of the pole figures for both phases has allowed an insight into the mode of transformation of the alpha to the beta phase, and it appears that the beta phase forms by the growth of the preexisting beta, and not by fresh nucleation of beta in the alpha phase.
