Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Characterization And Modeling Of Dislocation Precipitation Interactions In Aluminum Alloys
Download Characterization And Modeling Of Dislocation Precipitation Interactions In Aluminum Alloys full books in PDF, epub, and Kindle. Read online Characterization And Modeling Of Dislocation Precipitation Interactions In Aluminum Alloys ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Characterization and Modeling of Dislocation-precipitation Interactions in Aluminum Al[l]oys by : Reza Shahbazian Yassar
Download or read book Characterization and Modeling of Dislocation-precipitation Interactions in Aluminum Al[l]oys written by Reza Shahbazian Yassar and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation and Multi-scale Modeling of Strain Localization, Shear Banding and Fracture in Precipitation Hardened Aluminum Alloys by : Waqas Muhammad
Download or read book Experimental Investigation and Multi-scale Modeling of Strain Localization, Shear Banding and Fracture in Precipitation Hardened Aluminum Alloys written by Waqas Muhammad and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Finite element (FE) simulations are widely used in automotive design processes to model the forming and crashworthiness behavior of structural materials. Comprehensive material characterization and the availability of suitable constitutive models are prerequisites for accurate modeling of these operations. Numerical modeling of formability and crashworthiness is complex as it involves large deformations, instability, ruptures, damage propagation, and fracture. The effectiveness of computer-aided engineering (CAE) based design and performance evaluations significantly depends on the ability of numerical models to predict the material work hardening behavior, flow localization and fracture. This thesis presents a combined experimental and numerical study to explore microstructure property relationships involving strain localization, shear banding and fracture in precipitation hardened aluminum alloys. More specifically, the AA6xxx series aluminum alloys are of key interest for automotive applications, requiring good formability, hemmability and crash energy absorption characteristics. The goal of this work is to enhance the existing experimental understanding and modeling capabilities with respect to strain localization, shear banding and fracture in AA6xxx series precipitation hardened aluminum alloys, through development and coupling of multiscale modeling frameworks with advanced constitutive models for material work hardening and failure. In these regards, a crystal plasticity based constitutive hardening model is developed to account for the intragranular backstresses that arise from the formation of deformation induced dislocation substructure in precipitation hardened aluminum alloys. Based on thorough experimental investigation, it is learned that the substructure starts as pinned dislocation tangles with some regions having relatively high dislocation content while others being virtually dislocation free. With persistent deformation the substructure evolves into a well defined equiaxed cell/subgrain structure with majority of dislocations being trapped at the subgrain cell wall boundaries. The substructure induces intragranular backstresses due to blockage of dislocation passage leading to the experimentally observed Bauschinger effect at the macroscopic scale. The proposed hardening model accounts for these induced stresses and successfully predicts the experimentally measured flow behavior during cyclic simple shear and cyclic TCT and CTC loadings of AA6063. More importantly, the new backstress hardening model successfully reproduces the experimentally observed Bauschinger effect upon loading reversal. It is further shown that the crystallographic texture evolves significantly during cyclic simple shear deformation and the model successfully predicts the experimentally observed texture evolution. The study reveals that for proper prediction of flow behavior and the experimentally observed Bauschinger effect in precipitation hardened aluminum alloys, a physically motivated model that can account for the induced internal stresses, must be employed to describe material hardening on a polycrystalline level. Next, a multiscale modeling approach is developed where a macro-scale component level simulation is performed using conventional phenomenological plasticity and the boundary conditions of the region of interest are extracted and applied to the crystal plasticity based finite element model to account for the relevant microstructural physics. The proposed approach is successfully validated by simulating wrap-bending deformation of AA6063 and by comparing the observed texture evolution, slip band formation within grains, through thickness strain localization and the development of surface roughness with corresponding experimental data. The proposed approach enhances existing modeling capabilities for better predictability of material response under complex loading paths. After developing the multiscale framework, a new constitutive approach is developed to predict failure by extending the existing nano-void theory of ductile failure to precipitation hardened aluminum alloys by accounting for the effects of precipitation induced dislocation substructure on point defect generation. A new evolution law for the effective obstacle strength associated with substructure evolution is incorporated into the formulation. The proposed failure criterion is successfully validated against experimental data and its versatility is demonstrated by coupling the failure criterion with stress-strain data generated through crystal plasticity simulations, to predict failure strain for arbitrary loading - stress triaxiality conditions. Next, a comprehensive experimental investigation is performed to study the relationship between microstructure, plastic deformation and fracture behavior of precipitation hardened aluminum alloy AA6016 during bending. It is shown that the bendability of AA6016 alloy is limited by the formation of severe surface undulations and surface cracking, which are associated with the heterogenous nature of slip concentrating into coarse slip bands and intense shear banding originating from surface low cusps in the form of mutually orthogonal transgranular bands. Micro-cracks originate from low cusp regions along the outer tensile surface and propagate along the intensely sheared planes within shear bands. Results show that grains with S texture component are prone to shear banding and failure during bending and the contrary is true for Cube oriented grains. It is observed that intergranular micro-void nucleation and crack propagation is favored in areas with high grain boundary misorientations and intense slip band impingements along boundaries, perhaps due to the reduction in local cohesive strength of such boundaries. Finally, the developed multiscale modeling approach in conjunction with the newly developed hardening and failure models for age-hardenable aluminum alloys are applied to predict the experimentally observed shear banding and fracture behavior of AA6016 during bending. The simulated results successfully predict the experimentally observed shear banding and the predominant transgranular fracture behavior. It is shown that the advancing crack tip alternates from a less critical localization condition to a more critical one, as it requires lesser energy for the creation of new fracture surfaces while still sustaining the imposed plastic deformation. It is observed that Copper, Brass and Cube texture components show good resistance to shear banding and are therefore characterized as high bendability components, whereas the contrary is true for the S texture component. Lastly, the coupled numerical framework, presented herein, provides an excellent tool for CAE, virtual material characterization and analysis of microstructure-property relationships.
Book Synopsis Fundamentals of Aluminium Metallurgy by : Roger Lumley
Download or read book Fundamentals of Aluminium Metallurgy written by Roger Lumley and published by Elsevier. This book was released on 2010-11-25 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminium is an important metal in manufacturing, due to its versatile properties and the many applications of both the processed metal and its alloys in different industries. Fundamentals of aluminium metallurgy provides a comprehensive overview of the production, properties and processing of aluminium, and its applications in manufacturing industries. Part one discusses different methods of producing and casting aluminium, covering areas such as casting of alloys, quality issues and specific production methods such as high-pressure diecasting. The metallurgical properties of aluminium and its alloys are reviewed in Part two, with chapters on such topics as hardening, precipitation processes and solute partitioning and clustering, as well as properties such as fracture resistance. Finally, Part three includes chapters on joining, laser sintering and other methods of processing aluminium, and its applications in particular areas of industry such as aerospace. With its distinguished editor and team of expert contributors, Fundamentals of aluminium metallurgy is a standard reference for researchers in metallurgy, as well as all those involved in the manufacture and use of aluminium products. Provides a comprehensive overview of the production, properties and processing of aluminium, and its applications in manufacturing industries Considers many issues of central importance in aluminium production and utilization considering quality issues and design for fatigue growth resistance Metallurgical properties of aluminium and its alloys are further explored with particular reference to work hardening and applications of industrial alloys
Book Synopsis Strengthening Mechanisms in Crystal Plasticity by : Ali Argon
Download or read book Strengthening Mechanisms in Crystal Plasticity written by Ali Argon and published by Oxford University Press on Demand. This book was released on 2008 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technologically important metals and alloys have been strengthened throughout history by empirical means. The scientific bases of the central mechanisms of such forms of strengthening, developed over the past several decades are presented here through mechanistic models and associated experimental results.
Book Synopsis Fundamental Aspects of Dislocation Interactions by : G. Kostorz
Download or read book Fundamental Aspects of Dislocation Interactions written by G. Kostorz and published by Elsevier. This book was released on 2013-09-03 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental Aspects of Dislocation Interactions: Low-Energy Dislocation Structures III covers the papers presented at a European Research Conference on Plasticity of Materials-Fundamental Aspects of Dislocation Interactions: Low-Energy Dislocation Structures III, held on August 30-September 4, 1992 in Ascona, Switzerland. The book focuses on the processes, technologies, reactions, transformations, and approaches involved in dislocation interactions. The selection first offers information on work softening and Hall-Petch hardening in extruded mechanically alloyed alloys and dynamic origin of dislocation structures in deformed solids. Discussions focus on stress-strain behavior in relation to composition, structure, and annealing; comparison of stress-strain curves with work softening theory; sweeping and trapping mechanism; and model of dipolar wall structure formation. The text then ponders on plastic instabilities and their relation to fracture and dislocation and kink dynamics in f.c.c. metals studied by mechanical spectroscopy. The book takes a look at misfit dislocation generation mechanisms in heterostructures and evolution of dislocation structure on the interfaces associated with diffusionless phase transitions. Discussions focus on dislocation representation of a wall of elastic domains; equation of equilibrium of an elastic domain; transformation of dislocations; and theoretical and experimental background. The selection is a valuable reference for readers interested in dislocation interactions.
Book Synopsis Dislocation -Obstacle Interactions in Aluminum Alloys by : Blythe Gore Clark
Download or read book Dislocation -Obstacle Interactions in Aluminum Alloys written by Blythe Gore Clark and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book M3D III written by Alan Wolfenden and published by ASTM International. This book was released on 1997 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprises 27 papers from the November 1995 symposium in Norfolk, Virginia. Covers the intersection of the fields of mechanics of solids and materials science. Representative topics: internal friction associated with discontinuous precipitation in lead-tin alloys, magnetomechanical damping in thermal
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of Threshold Stress in Dispersion Strengthened Aluminum Alloys by : Sachin Deshmukh
Download or read book An Investigation of Threshold Stress in Dispersion Strengthened Aluminum Alloys written by Sachin Deshmukh and published by . This book was released on 2005 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The high creep resistance of dispersion-strengthened alloys is a result of a threshold stress, which is determined by the attractive dislocation-particle interaction. The change of dislocation-particle interaction with temperature and the resultant threshold stress have been identified as research areas that need focused effort to improve the fundamental understanding of creep deformation of dispersion strengthened materials. Al-6Mg-2Sc-1Zr, Al-6Mg-1Sc-1Zr-10 vol.% SiC and Al-5Y2O3-10SiC systems were chosen for this study. Conventional creep experiments were carried out at constant load to study the creep mechanism and threshold stress in creep. The temperature of creep experiment performed was in the range of 423 to 573 K. (0.4 to 0.6 T[subscript m]). Creep data obtained in all the system mentioned above ranges over 8 orders of magnitude of strain rate. The analysis of the creep data obtained in the investigation have provided information on the creep characteristics of the alloy including the shape of the creep curve, the temperature dependence of the creep rate, the stress dependence of the creep rate and the details of creep mechanism. Microstructures were evaluated using optical, scanning and transmission electron microscopy. A threshold type creep behavior was measured and explained by observed dislocation-particle interactions. When threshold stress is incorporated into the analysis, it is shown that the stress exponent is ~5 and activation energy is close to the value for lattice self diffusion of pure aluminum. These results suggest that dislocation climb in the aluminum alloy is the rate controlling the creep process in this composite. The composite showed increased creep resistance at higher temperature compared to the unreinforced alloy. The dislocation-particle interaction was studied in composite by in-situ straining experiments in a transmission electron microscope. The experiments were conducted in order to find the deformation micromechanics involved at creep temperatures. In-situ TEM straining experiment showed that dislocations spend most of the time interacting with particle during the climb by-pass processes. Particle pinning strength was determined from the dislocation curvature and critical bow-out angle before the detachment at various temperatures and compared with the experimentally observed threshold stress values. The in-situ experiments support observations of attractive dislocation particle interaction obtained in last two decades by conventional TEM. At each temperature mean detachment stress values calculated from critical dislocation configuration lower than the experimental thresholds stress indicating a contribution from load transfer to reinforcement phase. A new positive climb model is proposed for the threshold stress in dispersion strengthen alloy. The model incorporates the concept of dislocation core relaxation at the particle-matrix interface which leads to attractive dislocation-particle interaction. The model predicts a temperature dependent threshold stress and the predicated creep behavior is in reasonable agreement with the behavior of an Al-Sc alloy"--Abstract, pages iv-v.
Book Synopsis Characterization and Modeling of the Influence of the Ageing Treatment on the Precipitation Process and the Mechanical Behavior of the AlSi10Mg(Cu) Aluminum Alloy by : Xabier Larráyoz Izcara
Download or read book Characterization and Modeling of the Influence of the Ageing Treatment on the Precipitation Process and the Mechanical Behavior of the AlSi10Mg(Cu) Aluminum Alloy written by Xabier Larráyoz Izcara and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particle Strengthening of Metals and Alloys by : Eckhard Nembach
Download or read book Particle Strengthening of Metals and Alloys written by Eckhard Nembach and published by Wiley-VCH. This book was released on 1997 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thorough understanding of the processes governing particle strengthening of metals and alloys is crucial for anyone engaged in developing structural materials or designing with them. Now you can have easy access to the information you need with this unique guide, the most comprehensive and up-to-date resource available on this important subject. Written by an acknowledged leader in the field, Particle Strengthening of Metals and Alloys offers complete coverage of shearing and bypassing of particles by dislocations. From Friedel's model to Foreman and Makin's work and beyond, the book features a broad range of both analytical approaches and computer simulations, and applies these techniques to key strengthening mechanisms--including chemical, modulus mismatch, stacking fault energy mismatch, lattice mismatch, and order strengthening. You will find detailed treatment of the Orowan process of particle circumvention, plus separate chapters on the superposition of different strengthening mechanisms, particle hardening of magnetic materials, and more. Combining a wealth of crucial information in one volume, Particle Strengthening of Metals and Alloys is essential reading for anyone whose work demands maximum understanding of the properties of materials. Scientists and others will and this unique text to be an indispensable addition to their professional library. Here is the complete guide to particle strengthening mechanisms for metals and alloys. With full coverage of both shearing and bypassing of particles by dislocations, this high-grade text makes it easy for you to access the information you need--quickly and reliably. Whether you are engaged in the development of structural materials or are simply seeking a better understanding of the properties of materials, Particle Strengthening of Metals and Alloys is an invaluable and matchless resource which features: * Complete coverage of shearing processes of coherent particles, including analytical approaches and computer simulations * A broad range of particle-dislocation interaction mechanisms, including chemical, lattice mismatch, and order hardening * In-depth treatment of the Orowan process of particle circumvention * Superposition of different strengthening mechanisms, particle hardening of ferromagnetic materials, and more
Book Synopsis Integrated Multiscale Characterization and Modeling of Ductile Fracture in Heterogeneous Aluminum Alloys by : Dakshina M. Valiveti
Download or read book Integrated Multiscale Characterization and Modeling of Ductile Fracture in Heterogeneous Aluminum Alloys written by Dakshina M. Valiveti and published by . This book was released on 2009 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: The multiscale model developed in this work captures detailed microscopic crack initiation and propagation in a large domain with minimal computational expense. The effectiveness of this multiscale characterization-modeling framework is demonstrated by studying structure-property relation and simulating ductile fracture in cast Aluminum alloy A319.
Book Synopsis Mechanical Properties of Engineered Materials by : Wole Soboyejo
Download or read book Mechanical Properties of Engineered Materials written by Wole Soboyejo and published by CRC Press. This book was released on 2002-11-20 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Featuring in-depth discussions on tensile and compressive properties, shear properties, strength, hardness, environmental effects, and creep crack growth, "Mechanical Properties of Engineered Materials" considers computation of principal stresses and strains, mechanical testing, plasticity in ceramics, metals, intermetallics, and polymers, materials selection for thermal shock resistance, the analysis of failure mechanisms such as fatigue, fracture, and creep, and fatigue life prediction. It is a top-shelf reference for professionals and students in materials, chemical, mechanical, corrosion, industrial, civil, and maintenance engineering; and surface chemistry.
Book Synopsis Time-resolved and Three-dimensional Study of Dislocation-particle Interactions in Aluminum and Copper Alloys by : Grace Liu
Download or read book Time-resolved and Three-dimensional Study of Dislocation-particle Interactions in Aluminum and Copper Alloys written by Grace Liu and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dislocation-particle interactions in three alloys systems, Al-Cu, Al-Mg-Sc, and Cu-Co have been investigated using in situ straining experiments inside the transmission electron microscope, post mortem analysis, and electron tomographic reconstructions. Specifically, diffraction-contrast electron tomography was developed during the course of this work as a 3D imaging technique for crystalline systems such that the dislocation and defect arrangement could be fully characterized and spatially-resolved. Micrographs imaged using two-beam and kinematical bright-field and weak-beam dark-field conditions were acquired over an angular range then used to reconstruct the tomograms. Supplemental advances to the technique include: Visualization of dislocations in color based on Burgers vector or other relevant characteristics; determination of the specimen coordinate system in the tomogram; and overcoming the g 8́9 b invisibility condition by dual-axes tomography. In the Al-Cu system, which contained Al2Cu plate-shaped particles residing on {001}Al habit planes, in situ straining experiments revealed glide of lattice dislocations in the coherent side of the particle-matrix interface. The confined dislocations escaped the interface by cross-slip after reaching one end of the Al2Cu plate or by shearing the particle, as observed during post mortem analysis. Dislocations bypassed the particles by shear at multiple locations along their length, suggesting that a shearing site becomes more unfavorable with each dislocation passage such that adjacent slip systems must be activated in order to continue shear. When highly deformed, the inter-particle region was shown by electron tomography to be populated with a complex configuration of lattice dislocations pinned at both ends on a particle interface as well as debris created from dislocation-dislocation interactions. In the Cu-Co system, semicoherent Co-rich octahedral particles normally unshearble by lattice dislocations were observed to be sheared by small twins emanating from the Cu matrix. This new deformation behavior was attributed to the high strain rates associated with twinning and a small increase in interfacial energy associated with shearing of Co particles, which has the same stacking as the Cu matrix. Interactions with lattice dislocations, on the other hand, exhibited similar behavior during in situ and post mortem observations as the Al-Mg-Sc system, which contained Al3Sc particles. In the semi-coherent regime, between 40 nm and up to around 200 nm for Al3Sc and 100 nm for Co, an initial elastic interaction from the misfit strain field gave way to a novel bypass mechanism involving the creation of half-loops attached on one side to the particle interface via bowing and cross-slip while locally pinned at on the particle interface. Bypass of such a particle also involved interfacial dislocations, which increased the complexity of the particle-matrix interface and impeded subsequent bypass of the same particle. In all cases, multiple interactions with lattice dislocations resulted in the evolution of defect structures around a particle over time and the interactions examined were more complex than single dislocation-single particle interactions depicted in classical theoretical models.
Book Synopsis Modeling and Experimental Characterization of the Interfacial Behavior of High Strength Aluminum Alloys by : William Morgan Lee
Download or read book Modeling and Experimental Characterization of the Interfacial Behavior of High Strength Aluminum Alloys written by William Morgan Lee and published by . This book was released on 2011 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity by : Katia Mocellin
Download or read book Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity written by Katia Mocellin and published by Springer Nature. This book was released on 2023-08-19 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume highlights the latest advances, innovations, and applications in the field of metal forming, as presented by leading international researchers and engineers at the 14th International Conference on Technology of Plasticity (ICTP), held in Mandelieu-La Napoule, France on September 24-29, 2023. It covers a diverse range of topics such as manufacturing processes & equipment, materials behavior and characterization, microstructure design by forming, surfaces & interfaces, control & optimization, green / sustainable metal forming technologies, digitalization & AI in metal forming, multi-material processing, agile / flexible metal forming processes, forming of non-metallic materials, micro-forming and luxury applications. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.
Book Synopsis Process-Structure-Property Relationships in Friction Stir Welded Precipitation Strengthened Aluminum Alloys by : Barnali Mondal
Download or read book Process-Structure-Property Relationships in Friction Stir Welded Precipitation Strengthened Aluminum Alloys written by Barnali Mondal and published by . This book was released on 2019 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through a series of carefully designed experiments, characterization and some modeling tools, this work is aimed at studying the role of thermal profiles on different microstructural zones and associated properties like strength and corrosion through a variation of weld parameters, thermal boundary conditions and material temper. Two different alloys belonging to the Al-Cu and Al-Cu-Li system in different temper conditions- peak aged (T8) and annealed (O) were used. A 3D-thermal pseudo mechanical (TPM) model is developed for the FSW process using heat transfer module in COMSOL Multiphysics and is based on a heat source wherein the temperature dependent yield shear stress is used for the heat generation. The precipitation and coarsening model is based on the Kampmann and Wagner theoretical framework and accounts for the competition between the various nucleation sites for both metastable and equilibrium precipitates. The model predicts different precipitate mean radius and volume fraction for the various zones in the friction stir welded material. A model for the yield strength is developed which considers contributions from different strengthening mechanisms. The predictions of the each models have been verified against experimental data and literature. At constant advance per rotation, the peak temperature decreases with a decrease in traverse speed and increases with an increase in tool rotation. Weld properties were significantly affected by choice of thermal boundary conditions in terms of backing plate diffusivity. Weld conditions with a higher peak temperature and high strain rate results in more dissolution of precipitates and fragmentation of constituent particles resulting in a better corrosion behavior for the weld nugget. For a peak aged temper of 2XXX alloys, the weld nugget experiences dissolution of strengthening precipitates resulting in a lower strength and the Heat affected zone (HAZ) experiences coarsening of precipitates. For an annealed material, both the weld nugget and HAZ experiences dissolution of precipitates with an increase in strength in the weld nugget.
![Download Characterization and Modeling of Dislocation-precipitation Interactions in Aluminum Al[l]oys PDF Online Free](https://books.google.com/books/content/images/frontcover/28jhjwEACAAJ?fife=w200-h370)
