Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Dislocation Interactions With Voids And Helium Bubbles In Fcc Metals
Download Dislocation Interactions With Voids And Helium Bubbles In Fcc Metals full books in PDF, epub, and Kindle. Read online Dislocation Interactions With Voids And Helium Bubbles In Fcc Metals ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Dislocation Interactions with Voids and Helium Bubbles in FCC Metals by : J. Young
Download or read book Dislocation Interactions with Voids and Helium Bubbles in FCC Metals written by J. Young and published by . This book was released on 2003 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formation of a high number density of helium bubbles in FCC metals irradiated within the fusion energy environment is well established. Yet, the role of helium bubbles in radiation hardening and mechanical property degradation of these steels remains an outstanding issue. In this paper, we present the results of a combined molecular dynamics simulation and in-situ straining transmission electron microscopy study, which investigates the interaction mechanisms between glissile dislocations and nanometer-sized helium bubbles. The molecular dynamics simulations, which directly account for dislocation core effects through semi-empirical interatomic potentials, provide fundamental insight into the effect of helium bubble size and internal gas pressure on the dislocation/bubble interaction and bypass mechanisms. The combination of simulation and in-situ straining experiments provides a powerful approach to determine the atomic to microscopic mechanisms of dislocation-helium bubble interactions, which govern the mechanical response of metals irradiated within the fusion environment.
Book Synopsis Dislocation Defect Interactions in Irradiated and Quenched FCC Metals by : Joshua Shane Robach
Download or read book Dislocation Defect Interactions in Irradiated and Quenched FCC Metals written by Joshua Shane Robach and published by . This book was released on 2003 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dislocations in Solids written by and published by Elsevier. This book was released on 2009-10-13 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bacon and Osetsky present an atomistic model of dislocation-particle interactions in metal systems, including irradiated materials. This work is important in simulating actual behavior, removing earlier reliance on assumed mechanisms for dislocation motion. New mechanisms for dislocation generation under shock loading are presented by Meyers et al. These models provide a basis for understanding the constitutive behavior of shocked material. Saada and Dirras provide a new perspective on the Hall-Petch relation, with particular emphasis on nanocrystals. Of particular significance, deviations from the traditional stress proportional to the square-root of grain size relation are explained. Robertson et al consider a number of effects of hydrogen on plastic flow and provide a model that provides an explanation of the broad range of properties. Flow stress of metal systems with particle hardening, including radiation effects New model for dislocation kinetics under shock loading Explanation of effects of nanoscale grain size on strength Mechanism of hydrogen embrittlement in metal alloys
Book Synopsis Radiation Damage in Materials by : Yongqiang Wang
Download or read book Radiation Damage in Materials written by Yongqiang Wang and published by MDPI. This book was released on 2020-12-28 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The complexity of radiation damage effects in materials that are used in various irradiation environments stems from the fundamental particle–solid interactions and the subsequent damage recovery dynamics after the collision cascades, which involves multiple length and time scales. Adding to this complexity are the transmuted impurities that are unavoidable from accompanying nuclear processes. Helium is one such impurity that plays an important and unique role in controlling the microstructure and properties of materials used in fast fission reactors, plasma-facing and structural materials in fusion devices, spallation neutron target designs, actinides, tritium-containing materials, and nuclear waste. Their ultra-low solubility in virtually all solids forces He atoms to self-precipitate into small bubbles that become nucleation sites for further void growth under radiation-induced vacancy supersaturations, resulting in material swelling and high-temperature He embrittlement, as well as surface blistering under low-energy and high-flux He bombardment. This Special Issue, “Radiation Damage in Materials—Helium Effects”, contains review articles and full-length papers on new irradiation material research activities and novel material ideas using experimental and/or modeling approaches. These studies elucidate the interactions of helium with various extreme environments and tailored nanostructures, as well as their impact on microstructural evolution and material properties.
Book Synopsis Dislocation interaction in F.C.C. metals during cyclic stresses by : Syed Badaruddin Hyder
Download or read book Dislocation interaction in F.C.C. metals during cyclic stresses written by Syed Badaruddin Hyder and published by . This book was released on 1968 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atomic-level Interaction of an Edge Dislocation and Localized Obstacles in Fcc and Bcc Metals by :
Download or read book Atomic-level Interaction of an Edge Dislocation and Localized Obstacles in Fcc and Bcc Metals written by and published by . This book was released on 2004 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interaction between a moving dislocation and localized obstacles determines microstructure-induced hardening. The mechanisms and parameters of such interactions are necessary inputs to large scale dislocation dynamics modelling. We have developed a model to investigate these characteristics at the atomic level for dislocation-obstacle interactions under both static (T=0K) and dynamic (T>0K) conditions. We present results on hardening due to pinning of edge dislocations at obstacles such as voids, coherent precipitates and stacking fault tetrahedra in bcc-iron and fcc-copper at temperatures from 0 to 600K. It is demonstrated that atomic-scale simulation is required to determine the effects of stress, strain rate and temperature and that such effects cannot always be rationalized within continuum theory.
Book Synopsis Fundamentals of Radiation Materials Science by : Gary S. Was
Download or read book Fundamentals of Radiation Materials Science written by Gary S. Was and published by Springer Science & Business Media. This book was released on 2007-07-14 with total page 827 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an eye-opening treatise on the fundamentals of the effects of radiation on metals and alloys. When energetic particles strike a solid, numerous processes occur that can change the physical and mechanical properties of the material. Metals and alloys represent an important class of materials that are subject to intense radiation fields. Radiation causes metals and alloys to swell, distort, blister, harden, soften and deform. This textbook and reference covers the basics of particle-atom interaction for a range of particle types, the amount and spatial extent of the resulting radiation damage, the physical effects of irradiation and the changes in mechanical behavior of irradiated metals and alloys.
Book Synopsis Dislocations and Properties of Real Materials by : Metals Society. Metal Science Committee
Download or read book Dislocations and Properties of Real Materials written by Metals Society. Metal Science Committee and published by Ashgate Publishing. This book was released on 1985 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigations on the Interactions Between Point Defects and Dislocations by : Doris Kuhlmann-Wilsdorf
Download or read book Investigations on the Interactions Between Point Defects and Dislocations written by Doris Kuhlmann-Wilsdorf and published by . This book was released on 1963 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Interactions Between Dislocations and Point Defects by : B. L. Eyre
Download or read book The Interactions Between Dislocations and Point Defects written by B. L. Eyre and published by . This book was released on 1969* with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interaction of Prismatic and Glissile Dislocations by : G. Saada
Download or read book Interaction of Prismatic and Glissile Dislocations written by G. Saada and published by . This book was released on 1962 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Institute of Mining and Metallurgical Engineers. Institute of Metals Division Publisher : ISBN 13 : Total Pages :224 pages Book Rating :4.F/5 ( download)
Book Synopsis Dislocations in Metals by : American Institute of Mining and Metallurgical Engineers. Institute of Metals Division
Download or read book Dislocations in Metals written by American Institute of Mining and Metallurgical Engineers. Institute of Metals Division and published by . This book was released on 1954 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Point Defects and Defect Interactions in Metals by : Jin-ichi Takamura
Download or read book Point Defects and Defect Interactions in Metals written by Jin-ichi Takamura and published by Elsevier Science & Technology. This book was released on 1982 with total page 1026 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atomistically-informed Dislocation Dynamics in Fcc Crystals by :
Download or read book Atomistically-informed Dislocation Dynamics in Fcc Crystals written by and published by . This book was released on 2006 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: We develop a nodal dislocation dynamics (DD) model to simulate plastic processes in fcc crystals. The model explicitly accounts for all slip systems and Burgers vectors observed in fcc systems, including stacking faults and partial dislocations. We derive simple conservation rules that describe all partial dislocation interactions rigorously and allow us to model and quantify cross-slip processes, the structure and strength of dislocation junctions and the formation of fcc-specific structures such as stacking fault tetrahedra. The DD framework is built upon isotropic non-singular linear elasticity, and supports itself on information transmitted from the atomistic scale. In this fashion, connection between the meso and micro scales is attained self-consistently with core parameters fitted to atomistic data. We perform a series of targeted simulations to demonstrate the capabilities of the model, including dislocation reactions and dissociations and dislocation junction strength. Additionally we map the four-dimensional stress space relevant for cross-slip and relate our findings to the plastic behavior of monocrystalline fcc metals.
Download or read book Key Engineering Materials written by and published by . This book was released on 2007 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quasi-four-dimensional Characterization of Dislocation Interactions in FCC and HCP Systems by :
Download or read book Quasi-four-dimensional Characterization of Dislocation Interactions in FCC and HCP Systems written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dislocation Dynamics of Face-centered Cubic Metals and Alloys by : Ryan B. Sills
Download or read book Dislocation Dynamics of Face-centered Cubic Metals and Alloys written by Ryan B. Sills and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Face-centered cubic (FCC) metals and alloys--such as aluminum, copper, and austenitic stainless steel--are ubiquitous in the automotive, aerospace, and oil and gas industries. To further our understanding of the nature of plastic deformation in these materials, we have utilized dislocation dynamics (DD) simulations. We begin with a study of time integration in dislocation dynamics, examining the time-step-limiting aspects of DD, and developing a new subcycling-based time integrator that improves efficiency 100-fold. We then utilize this time integrator to study the basics of plasticity in pure, single crystalline copper. DD simulations were run over a wide range of strain rates and initial dislocation densities, examining how the yield strength and hardening rate vary, and making comparisons against the available experimental data. A detailed study on the contribution of binary dislocation junctions to hardening is then presented, showing that these junctions are an essential ingredient for hardening to occur. We then go on to study the most common strengthening mechanisms employed in FCC metals: solid solution strengthening and precipitation strengthening. After deriving the suitable chemical potential for the solute atoms comprising a solid solution, the influence of an "atmosphere" of solutes surrounding a dislocation on the stress field and line tension of the dislocation are examined, showing that these effects are generally small. The drag force exerted on dislocations by their atmospheres is then studied. We find these drag forces are often larger than those due to lattice friction, and can influence plasticity in FCC materials significantly. To study precipitation strengthening, a new algorithm for simulating dislocation-precipitate interactions is developed, which allows for ellipsoidal inclusions with arbitrary aspect ratio and arbitrary misfit. The new formulation is used to study Orowan looping in overaged aluminum-copper alloys, which have plate-like precipitates. The results and methods presented here constitute a broad set of advancements towards a more sound understanding of plastic deformation in FCC metals and alloys.
