Download or read book The Deformation Mechanisms of Some B C C Metals written by Richard Anthony Maynard and published by . This book was released on 1971 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deformation Mechanisms written by and published by . This book was released on 1988 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deformation mechanisms of hcp metals are more complex and less well investigated than those of, for example, face-centered cubic (fcc) and body-centered cubic (bcc) metals [4,12-15].
Download or read book Plastic Deformation of Materials written by R. J. Arsenault and published by Elsevier. This book was released on 2013-10-22 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatise on Materials Science and Technology, Volume 6: Plastic Deformation of Materials covers the fundamental properties and characterization of materials, ranging from simple solids to complex heterophase systems. The book presents articles on the low temperature of deformation of bcc metals and their solid-solution alloys; the cyclic deformation of metals and alloys; and the high-temperature diffusion-controlled creep of some metals and alloys, with particular reference to the various creep mechanisms. The text also includes articles on superplasticity; the fatigue deformation of polymers; the low temperature deformation of crystalline nonmetals; and the recovery and recrystallization during high temperature deformation. Professional scientists and engineers, as well as graduate students in materials science and associated fields will find the book invaluable.
Download or read book Testing of the Plastic Deformation of Metals written by T. W. Clyne and published by Cambridge University Press. This book was released on 2021-06-10 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discover a novel approach to the subject, providing detailed information about established and innovative mechanical testing procedures.
Download or read book Thermally Activated Mechanisms in Crystal Plasticity written by D. Caillard and published by Elsevier. This book was released on 2003-09-08 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: KEY FEATURES: - A unified, fundamental and quantitative resource. The result of 5 years of investigation from researchers around the world - New data from a range of new techniques, including synchrotron radiation X-ray topography provide safer and surer methods of identifying deformation mechanisms - Informing the future direction of research in intermediate and high temperature processes by providing original treatment of dislocation climb DESCRIPTION: Thermally Activated Mechanisms in Crystal Plasticity is a unified, quantitative and fundamental resource for material scientists investigating the strength of metallic materials of various structures at extreme temperatures. Crystal plasticity is usually controlled by a limited number of elementary dislocation mechanisms, even in complex structures. Those which determine dislocation mobility and how it changes under the influence of stress and temperature are of key importance for understanding and predicting the strength of materials. The authors describe in a consistent way a variety of thermally activated microscopic mechanisms of dislocation mobility in a range of crystals. The principles of the mechanisms and equations of dislocation motion are revisited and new ones are proposed. These describe mostly friction forces on dislocations such as the lattice resistance to glide or those due to sessile cores, as well as dislocation cross-slip and climb. They are critically assessed by comparison with the best available experimental results of microstructural characterization, in situ straining experiments under an electron or a synchrotron beam, as well as accurate transient mechanical tests such as stress relaxation experiments. Some recent attempts at atomistic modeling of dislocation cores under stress and temperature are also considered since they offer a complementary description of core transformations and associated energy barriers. In addition to offering guidance and assistance for further experimentation, the book indicates new ways to extend the body of data in particular areas such as lattice resistance to glide.
Download or read book A Second Report on Deformation Mechanism Maps written by H. J. Frost and published by . This book was released on 1973 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: A crystalline solid can deform plastically in a number of ways. Deformation mechanism diagrams can be constructed which show the fields of stress and temperature in which a given mechanism is dominant and the strain-rate that it yields. This second report presents detailed maps for five pure f.c.c. metals (Ni, Cu, Ag, Al and Pb), six pure b.c.c. metals (V, Cr, Nb, Mo, Ta and W) and a recrystallized Ni - 1 vol% ThO2 alloy, which are based on direct comparison to available experimental data. It also presents further discussion of the various deformation mechanisms, with refinements of their rate equations. Various applications of the diagrams are illustrated. They provide a convenient means for the normalized comparison of the behavior of different metals. They also demonstrate the effects of various changes in materials in a manner useful for qualitative engineering design. (Author).
Download or read book Deformation mechanism Maps written by H. J. Frost and published by Pergamon. This book was released on 1982 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dislocation Dynamics and Plasticity written by Taira Suzuki and published by Springer Science & Business Media. This book was released on 2013-03-07 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the 1950s the direct observation of dislocations became possible, stimulat ing the interest of many research workers in the dynamics of dislocations. This led to major contributions to the understanding of the plasticity of various crys talline materials. During this time the study of metals and alloys of fcc and hcp structures developed remarkably. In particular, the discovery of the so-called in ertial effect caused by the electron and phonon frictional forces greatly influenced the quantitative understanding of the strength of these metallic materials. Statis tical studies of dislocations moving through random arrays of point obstacles played an important role in the above advances. These topics are described in Chaps. 2-4. Metals and alloys with bcc structure have large Peierls forces compared to those with fcc structure. The reasons for the delay in studying substances with bcc structure were mostly difficulties connected with the purification techniques and with microscopic studies of the dislocation core. In the 1970s, these difficulties were largely overcome by developments in experimental techniques and computer physics. Studies of dislocations in ionic and covalent bonding materials with large Peierls forces provided infonnation about the core structures of dislocations and their electronic interactions with charged particles. These are the main subjects in Chaps. 5-7.
Download or read book Strength of Metals and Alloys written by P. Haasen and published by Elsevier. This book was released on 2016-06-06 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strength of Metals and Alloys is a collection of papers presented at the 5th International Conference on the Strength of Metals and Alloys held in Aachen, Germany, on August 27-31, 1979. Contributors explore advances that have been made in understanding the strength of metals and alloys and cover topics ranging from plasticity and crystal structure to microstructural models for friction and wear; dynamical effects in deformation; and microscopic mechanisms of metal fatigue. This volume is comprised of 13 chapters and begins with an analysis of the differences between the plastic deformation of face-centered cubic, hexagonal close-packed, and body-centered cubic metals in relation to intrinsic dislocation mobilities resulting from the interaction of the dislocation core with the crystal lattice. The reader is then introduced to dislocation models for fatigue and their application to cases of friction and wear. The following chapters focus on the mechanisms controlling the creep of single phase metals and alloys; precipitation and dispersion hardening; deformation of polycrystals; solid solution hardening; and superposition of alloy hardening, strain hardening, and dynamic recovery. The results of in situ deformation experiments using high-voltage electron microscopy are also presented. The final chapter is devoted to the mechanisms underlying the recovery and recrystallization of doped tungsten. This monograph will be a valuable resource for metallurgists and materials scientists.
Download or read book Fundamentals of Creep in Metals and Alloys written by Michael E. Kassner and published by Elsevier. This book was released on 2004-04-06 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Numerous line drawings with consistent format and units allow easy comparison of the behavior of a very wide range of materials * Transmission electron micrographs provide a direct insight in the basic microstructure of metals deforming at high temperatures * Extensive literature review of over 1000 references provide an excellent reference document, and a very balanced discussionUnderstanding the strength of materials at a range of temperatures is critically important to a huge number of researchers and practitioners from a wide range of fields and industry sectors including metallurgists, industrial designers, aerospace R&D personnel, and structural engineers. The most up-to date and comprehensive book in the field, Fundamentals of Creep in Metals and Alloys discusses the fundamentals of time-dependent plasticity or creep plasticity in metals, alloys and metallic compounds. This is the first book of its kind that provides broad coverage of a range of materials not just a sub-group such as metallic compounds, superalloys or crystals. As such it presents the most balanced view of creep for all materials scientists. The theory of all of these phenomena are extensively reviewed and analysed in view of an extensive bibliography that includes the most recent publications in the field. All sections of the book have undergone extensive peer review and therefore the reader can be sure they have access to the most up-to-date research, fully interrogated, from the world's leading investigators.· Numerous line drawings with consistent format and units allow easy comparison of the behavior of a very wide range of materials· Transmission electron micrographs provide a direct insight in the basic microstructure of metals deforming at high temperatures· Extensive literature review of over 1000 references provide an excellent reference document, and a very balanced discussion
Download or read book Deformation Mechanisms Texture and Anisotropy in Zirconium and Zircaloy written by Erich Tenckhoff and published by ASTM International. This book was released on 1988 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasticity and Failure in Nanocrystalline BCC Metals Via Molecular Dynamics Simulation written by and published by . This book was released on 2010 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in the ability to generate extremely high pressures in dynamic experiments such as at the National Ignition Facility has motivated the need for special materials optimized for those conditions as well as ways to probe the response of these materials as they are deformed. We need to develop a much deeper understanding of the behavior of materials subjected to high pressure, especially the effect of rate at the extremely high rates encountered in those experiments. Here we use large-scale molecular dynamics (MD) simulations of the high-rate deformation of nanocrystalline tantalum at pressures less than 100 GPa to investigate the processes associated with plastic deformation for strains up to 100%. We focus on 3D polycrystalline systems with typical grain sizes of 10-20 nm. We also study a rapidly quenched liquid (amorphous solid) tantalum. We apply a constant volume (isochoric), constant temperature (isothermal) shear deformation over a range of strain rates, and compute the resulting stress-strain curves to large strains for both uniaxial and biaxial compression. We study the rate dependence and identify plastic deformation mechanisms. The identification of the mechanisms is facilitated through a novel technique that computes the local grain orientation, returning it as a quaternion for each atom. This analysis technique is robust and fast, and has been used to compute the orientations on the fly during our parallel MD simulations on supercomputers. We find both dislocation and twinning processes are important, and they interact in the weak strain hardening in these extremely fine-grained microstructures. We also present some results on void growth in nanocrystalline BCC metals under tension.
Download or read book Local and Polycrystalline Textures in BCC Metals Their Evolution and Effect on Mechanical Response written by and published by . This book was released on 2004 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Texture development in BCC metals follows from the active deformation mechanisms and imposed strain path. Tensile, compressive, plane strain, and shear deformation induce different crystal rotations and thus resultant textures at both the macroscale and mesoscale. This work investigates the interaction of texture and bulk plasticity with regards to constitutive behavior, strain localization, and damage initiation in BCC metals. Tantalum and low-carbon steel were analyzed by electron backscatter diffraction to determine the crystallographic mesostructure, while mechanical testing was performed over a range of strain rates and temperatures. Polycrystal plasticity modeling was used to predict texture evolution for a suite of strain paths and to calculate multi-dimensional yield surfaces. The calculated yield surfaces were then applied to estimate texture effects on mechanical properties. Measuring the plastic anisotropy associated with experimental compression samples enabled validation of these simulations. The impact of relative slip system activity on anisotropic plasticity will also be explored.
Download or read book Plasticity and Failure in Nanocrystalline BCC Metals Via MD Simulation written by and published by . This book was released on 2010 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in the ability to generate extremely high pressures in dynamic experiments such as at the National Ignition Facility has motivated the need for special materials optimized for those conditions as well as ways to probe the response of these materials as they are deformed. We need to develop a much deeper understanding of the behavior of materials subjected to high pressure, especially the effect of rate at the extremely high rates encountered in those experiments. Here we use large-scale molecular dynamics (MD) simulations of the high-rate deformation of nanocrystalline tantalum at pressures less than 100 GPa to investigate the processes associated with plastic deformation for strains up to 100%. We focus on 3D polycrystalline systems with typical grain sizes of 10-20 nm. We also study a rapidly quenched liquid (amorphous solid) tantalum. We apply a constant volume (isochoric), constant temperature (isothermal) shear deformation over a range of strain rates, and compute the resulting stress-strain curves to large strains for both uniaxial and biaxial compression. We study the rate dependence and identify plastic deformation mechanisms. The identification of the mechanisms is facilitated through a novel technique that computes the local grain orientation, returning it as a quaternion for each atom. This analysis technique is robust and fast, and has been used to compute the orientations on the fly during our parallel MD simulations on supercomputers. We find both dislocation and twinning processes are important, and they interact in the weak strain hardening in these extremely fine-grained microstructures. We also present some results on void growth in nanocrystalline BCC metals under tension.
Download or read book Deformation Mechanisms During Compressive Loading of Tantalum and Tantalum 2 5 Weight Tungsten written by Rajeev Kapoor and published by . This book was released on 1998 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 The Hardness of Metals written by David Tabor and published by Oxford University Press. This book was released on 2000-08-03 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an attempt to explain hardness measurements of metals in terms of some of their more basic physical properties. The intention is to provide, for physicists, engineers, and metallurgists, a better understanding of what hardness means and what hardness measurements imply. The author emphasises the physical concepts involved, so that non-mathematical readers can grasp and appreciate the general physical picture without needing to follow the more detailed mathematical treatment.
