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Effect Of Stacking Fault Energy On Mechanism Of Plastic Deformation In Nanotwinned Fcc Metals
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Book Synopsis Effect of Stacking Fault Energy on Mechanism of Plastic Deformation in Nanotwinned FCC Metals by :
Download or read book Effect of Stacking Fault Energy on Mechanism of Plastic Deformation in Nanotwinned FCC Metals written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: When starting from a semi-empirical potential designed for Cu, we have developed a series of potentials that provide essentially constant values of all significant (calculated) materials properties except for the intrinsic stacking fault energy, which varies over a range that encompasses the lowest and highest values observed in nature. These potentials were employed in molecular dynamics (MD) simulations to investigate how stacking fault energy affects the mechanical behavior of nanotwinned face-centered cubic (FCC) materials. These results indicate that properties such as yield strength and microstructural stability do not vary systematically with stacking fault energy, but rather fall into two distinct regimes corresponding to 'low' and 'high' stacking fault energies.
Book Synopsis Large Deformation Stress - Strain Response in Low Stacking Fault Energy FCC Metals by : Ehab Adel El-Danaf
Download or read book Large Deformation Stress - Strain Response in Low Stacking Fault Energy FCC Metals written by Ehab Adel El-Danaf and published by . This book was released on 1998 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quasi-isentropic and Shock Compression of FCC and BCC Metals by : Hussam N. Jarmakani
Download or read book Quasi-isentropic and Shock Compression of FCC and BCC Metals written by Hussam N. Jarmakani and published by . This book was released on 2008 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quasi-isentropic compression experiments (ICE) of monocrystalline copper and nanocrystalline nickel and nickel-tungsten were carried out. The ICE process allows higher pressures to be accessed while minimizing the associated temperature rise. Monocrystalline copper was subjected to pressures between 18 GPa and 52 GPa, and the deformation substructure was studies via transmission electron microscopy (TEM). Current experimental evidence suggests a deformation substructure that transitions from slip to twinning, where twinning occurs at the higher pressures (~52 GPa), and heavily dislocated laths and dislocation cells take place at the intermediate and lower pressures. Evidence of stacking faults at the intermediate pressures was also found. The Preston-Tonks-Wallace constitutive description was used to model both quasi-isentropic and shock compression experiments and predict the pressure at which the slip-twinning transition occurs in both cases. Nanocrystalline nickel and nickel-tungsten, 13 at. % (G S between 10 and 50nm), subjected to pressures between 20 and 70 GPa, were also analyzed. Shock compression of mono and nanocrystalline nickel is simulated over a range of pressures (10-80 GPa) and compared with experimental results. Contributions to the net strain from the various mechanisms of plastic deformation such as partial dislocations, perfect dislocations, and twins are quantified in the nanocrystalline samples. The effect of stress unloading, a phenomenon often neglected in MD simulations, on dislocation behavior is computed. It is shown that a large fraction of the dislocations generated during compression is annihilated upon unloading. The present analysis resolves a disagreement consistently observed between MD computations and experimental results. Analytical models are applied to predict the critical pressures for the cell-to-stacking-fault transition and the onset of twinning as a function of grain-size and stacking-fault energy (through the addition of tungsten). These predictions are successfully compared with experimental results. Polycrystalline vanadium was subjected to shock compression followed by tensile wave release to study spall and fragmentation behavior. These experiments are part of an effort to help predict and minimize damage to diagnostic tools and protective shields of high-powered laser facilities such as the National Ignition Facility, NIF. The shock pulse was generated by a direct laser drive at energy levels ranging between 160 J and 440 J. Glass shields placed at a specific distance behind the Va targets were used to collect and analyze the ejected fragments in order to evaluate and quantify the extent of damage. The effects of target thickness, laser energy, and pulse duration were studied. Calculations show melting at a pressure threshold of ~150 GPa, which corresponds to a laser energy level of ~ 200 J. The recovered specimens and fragments show evidence of melting at the higher energy levels, consistent with the analytical predictions. Spalling occurred by a ductile tearing mechanism that favored grain boundaries. Experimentally obtained fragment sizes were compared with predictions from the Grady-Kipp model, and a good agreement was obtained. The spall strength of vanadium under laser loading conditions was calculated from the spall thickness and found to be in the 9-18 GPa range.
Book Synopsis Physical Principles of Plastic Deformation by : P. Polukhin
Download or read book Physical Principles of Plastic Deformation written by P. Polukhin and published by . This book was released on 1983 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Local Conditions on Deformation Processes in Low Stacking -Fault Energy FCC Alloys by :
Download or read book The Effect of Local Conditions on Deformation Processes in Low Stacking -Fault Energy FCC Alloys written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molecular Dynamics Simulation of Nanostructured Materials by : Snehanshu Pal
Download or read book Molecular Dynamics Simulation of Nanostructured Materials written by Snehanshu Pal and published by CRC Press. This book was released on 2020-04-28 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular dynamics simulation is a significant technique to gain insight into the mechanical behavior of nanostructured (NS) materials and associated underlying deformation mechanisms at the atomic scale. The purpose of this book is to detect and correlate critically current achievements and properly assess the state of the art in the mechanical behavior study of NS material in the perspective of the atomic scale simulation of the deformation process. More precisely, the book aims to provide representative examples of mechanical behavior studies carried out using molecular dynamics simulations, which provide contributory research findings toward progress in the field of NS material technology.
Book Synopsis The Plastic Deformation of Metals by : Robert William Kerr Honeycombe
Download or read book The Plastic Deformation of Metals written by Robert William Kerr Honeycombe and published by . This book was released on 1984 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamentals of Creep in Metals and Alloys by : Michael E. Kassner
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 discussion Understanding 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
Book Synopsis Plastic Deformation of Nickel-cobalt Alloys by : Vidya Sagar
Download or read book Plastic Deformation of Nickel-cobalt Alloys written by Vidya Sagar and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coating Materials written by Akarsh Verma and published by Springer Nature. This book was released on 2023-07-12 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively reviews assorted types of coatings, their applications, and various strategies employed by several scientists and researchers to fabricate them. Exclusively, the recent progress in computational strategies that are helpful to optimize the best suitable coating formulation before one goes for the real-time fabrication has been discussed in detail. And this book is also intended to shed light on the computational modeling techniques that are used in the characterization of various coating materials. It covers mechanisms, salient features, formulations, important aspects, and case studies of coatings utilized for various applications. The latest research in this area as well as possible avenues of future research is also highlighted to encourage the researchers.
Book Synopsis The Influence of Grain Boundaries and Stacking Faults on High Temperature Plastic Deformation by : Craig Radford Barrett
Download or read book The Influence of Grain Boundaries and Stacking Faults on High Temperature Plastic Deformation written by Craig Radford Barrett and published by . This book was released on 1964 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data are presented on the influence of grain boundaries and stacking faults on high temperature plastic defor mation. Three specific areas were investigated: (1) the influence of grain size and annealing treatment on the primary and steady state creep characteristics of high purity copper, (2) the influence of stacking fault energy on primary and steady state creep and (3) the influence of grain size on the dislocation substructure generated during creep of an Fe - 3.0% Si alloy.
Book Synopsis Interfacial Phenomena in Metals and Alloys by : Lawrence Eugene Murr
Download or read book Interfacial Phenomena in Metals and Alloys written by Lawrence Eugene Murr and published by Addison Wesley Publishing Company. This book was released on 1975 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Materials Finishing by : M.S.J. Hashmi
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
Book Synopsis Classical And Quantum Dynamics In Condensed Phase Simulations: Proceedings Of The International School Of Physics by : Bruce J Berne
Download or read book Classical And Quantum Dynamics In Condensed Phase Simulations: Proceedings Of The International School Of Physics written by Bruce J Berne and published by World Scientific. This book was released on 1998-06-17 with total page 881 pages. Available in PDF, EPUB and Kindle. Book excerpt: The school held at Villa Marigola, Lerici, Italy, in July 1997 was very much an educational experiment aimed not just at teaching a new generation of students the latest developments in computer simulation methods and theory, but also at bringing together researchers from the condensed matter computer simulation community, the biophysical chemistry community and the quantum dynamics community to confront the shared problem: the development of methods to treat the dynamics of quantum condensed phase systems.This volume collects the lectures delivered there. Due to the focus of the school, the contributions divide along natural lines into two broad groups: (1) the most sophisticated forms of the art of computer simulation, including biased phase space sampling schemes, methods which address the multiplicity of time scales in condensed phase problems, and static equilibrium methods for treating quantum systems; (2) the contributions on quantum dynamics, including methods for mixing quantum and classical dynamics in condensed phase simulations and methods capable of treating all degrees of freedom quantum-mechanically.
Book Synopsis Influence of Constitutive Laws on the Evolution of Micromechanical Field Variables During Deformation of FCC Metals by : Chaitali Shridhar Patil
Download or read book Influence of Constitutive Laws on the Evolution of Micromechanical Field Variables During Deformation of FCC Metals written by Chaitali Shridhar Patil and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding spatial evolution of micromechanical fields like effective stress or effective strain during deformation of polycrystalline materials is important for the whole life cycle of structural components, starting from process optimization to damage predictions. For this purpose, crystal plasticity modelling and simulation is an important predictive tool. Validity and accuracy of these simulations depend on the choice of the constitutive law. Therefore, this study assesses influence of the constitutive laws on the full field predictions of the crystal plasticity simulations. In this regard, we analysed two different aspects of the constitutive law. Firstly, one of the main components of the constitutive law for the plastic deformation is the hardening law. In this study, therefore, we compare full field predictions using the phenomenological Voce hardening law and the dislocation density based hardening law. As functional form of these two hardening laws is different, evolution of the critical resolved shear stress of the two laws need not to be same for all orientations during the deformation. Hence, we quantified differences in the local effective stress and texture predictions of the two laws during tensile deformation of copper. Crystal plasticity simulations were performed using a three dimensional (3D) fast Fourier transform-based elasto-viscoplastic (EVP-FFT) micromechanical solver. Simulation results show that the local distribution of stress strongly depends on the hardening rule. Average texture predicted by both the laws do not vary significantly. However, spatial orientation evolution (micro-texture) varies with increasing strain. This can be attributed to the spatially different shear strain accumulation between the two laws. Dislocation densities back calculated from the critical resolved shear stress are more homogeneous in the Voce hardening law than the predictions of the dislocation density based hardening law. Finally, dislocation density based law predicts higher accumulation of the dislocation density for the grains near the 001 orientation compared to grains with other orientations. Multiple slip activity within the 001 grains can result in higher accumulation of the dislocation density, which requires further experimental validation in the future. Secondly, cross slip of the screw dislocations is one of the important mechanisms of dislocation evolution during the deformation of medium to high stacking fault energy FCC metals. In the recent literature, it has been proposed that activation energy for the cross slip depends on the applied stress state. As a result, cross slip mediated dynamic recovery of the screw dislocations will also be influenced by the applied stress state. Hence, we incorporated the stress dependent dynamic recovery of the screw dislocations in the constitutive law. We analysed influence of the dynamic recovery on the evolution of the dislocation density and the micro-texture during the tension, compression as well as plane strain compression of polycrystalline aluminium. Even with the incorporation of the stress state dependent dynamic recovery, grain average dislocation density accumulation of the 001 grains is the highest during uniaxial deformation. Hence, detailed experimental and simulation analysis of these grains is required. In case of plane strain compression, dynamic recovery of the screw dislocations increases nucleation propensity of the cube orientation ({001}100). As the sharp cube texture is commonly observed after static recrystallization of FCC materials, our results highlight importance of dynamic recovery of the screw dislocations in the dislocation density based hardening laws.
Book Synopsis Size Effects on the Plastic Deformation of the BCC-metals Ta and Fe by : Daniel Kaufmann
Download or read book Size Effects on the Plastic Deformation of the BCC-metals Ta and Fe written by Daniel Kaufmann and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanomaterials by Severe Plastic Deformation by : Michael J. Zehetbauer
Download or read book Nanomaterials by Severe Plastic Deformation written by Michael J. Zehetbauer and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings of the "Second International Conference on Nanomaterials by Severe Plastic Deformation" review the enormous scientific avalanche that has been developing in the field over recent years. A valuable resource for any scientist and engineer working in this emerging field of nanotechnology.
