Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Defect evolution"”.
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Phase field modeling of the defect evolution and failure
… (PFDD) approach is introduced, which tracks the evolution of the dislocations in ultrafine and nano grained metals and takes into account the elastic interaction between dislocations, obstacles and the applied resolved shear stress on a single slip plane. Two phenomena, the reverse plastic strain …
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Computer simulation of defect evolution in lanthanum doped cerium dioxide under irradiation
… modeling methods are applied to explore the defect evolution in cerium dioxide under irradiation condition. In this study, conventional atomic potential for the cerium dioxide system with xenon, implanted as an important fission product, and lanthanum, doped to simulate trivalent solid …
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Microstructure, stress and defect evolution under illumination in hydrogenated amorphous silicon (a-Si:H)
… of the influence of illumination on hydrogen evolution and its relationship with the strain in illuminated layers.
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Molecular Dynamics study of defect evolution mechanisms in material of interests for quantum technologies [Studio di Dinamica Molecolare dei meccanismi di evoluzione dei difetti nei materiali di interesse per le tecnologie quantistiche]
Abbiamo studiato la formazione e l'evoluzione dei difetti nel 3C–SiC utilizzando simulazioni di dinamica molecolare classica con potenziali interatomici dipendenti dall'ambiente. Il benchmarking preliminare ha incluso parametri reticolari, energie di formazione dei difetti e calcoli del punto di …
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Fission Gas Transport and Its Interaction With Irradiation Induced Defects in Lanthanum Doped Ceria
… into the understanding of the mechanisms of defect evolution in the materials investigated. A model including both defect production and annihilation mechanisms has been proposed to explain the observed defect kinetics in the lower dose regime. A coalescence driven model has been proposed for …
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Microstructural investigations of ion (Kr) irradiated UO2
… electron microcopy to study and characterize the defect evolution in the microstructure. Results show defect nucleation with little growth at room temperature irradiations. As the temperature increases, defects nucleate and grow into dislocation loops and extended networks with increasing dose. At …
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In situ transmission electron microscopy ion irradiations of model iron-chromium alloys
… are used as a model to study the microstructural evolution of defects in irradiated structural steel components of a nuclear reactor. We examine the effects of temperature and chromium concentration on the defect evolution and segregation behavior in the early stages of damage. In situ …
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In-situ electron imaging of oxidation and reduction of rutile (TiO2) nanocrystals and interaction with palladium
… and the formation and rearrangements of defects. Here, we demonstrate that such structural changes can be directly observed using the new and improved environmental transmission electron microscopy (ETEM) methods. We focus on the surface and interface of TiO2 nanocrystals and Pd …
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4H silicon carbide particle detectors: study of the defects induced by high energy neutron irradiation
… used for their realization, is caused by lattice defects, like creation of point-like defect, dopant deactivation and dead layer formation and that a crucial aspect for the understanding of the defect kinetics at a microscopic level is the correct identification of the crystal defects in terms of …
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Systems Materials Design of Ordered Nanocomposite Assemblies
… I elucidate mechanisms of densification, defect evolution, and grain growth unique to colloidal systems, establishing processing–structure relationships that parallel but fundamentally diverge from atomic sintering. Finally, I extend these concepts to create stretchable nanocomposite …
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Bragg Coherent Diffraction Imaging of Metal Microcrystals Using a Multipurpose In Situ Cell Design
… understanding of their microstructural evolution under extreme conditions. In situ X-ray experiments offer a powerful means to investigate nanoscale defect evolution under reactor-relevant conditions. Bragg coherent diffraction imaging (BCDI), a synchrotron X-ray technique, enables …
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Fission gas transport and its interactions with irradiation-induced defects in lanthanum doped ceria
… fundamental mechanisms of irradiation-induced defect formation and evolution in nuclear fuel, similar combined modeling and experimental efforts have been carried out. Ceria (CeO2) was selected as a surrogate material for Uranium Dioxide (UO2) due to its many similar properties. Lanthanum (La) …
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KMC modeling of helium bubble clustering and evolution in BCC iron
The effect of helium in iron is an important issue in nuclear systems, as iron and iron alloys (steels) are the primary materials used for structural elements. Helium is known to cause embrittlement and decrease fatigue life, as well as aid creep and promote swelling. These effects can …
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A variational framework for multi-scale defect modeling in strained electronics and processing of composite materials
… technologies that may lead to the formation of defects within the material parts at critical location during processing. This dissertation presents a deterministic defect modeling framework based on a system of variationally consistent formulations that allow for the modeling of the material …
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Hydrogen evolution and transport in semiconductors
… the influence of lattice damage and hydrogen evolution. In particular, hydrogen-induced blistering and crater formation under thermal annealing from T=300-650 degrees Celsius was studied to determine the activation energies in Ge and Si in several crystalline orientations. Similar techniques …
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Hydrogen evolution and transport in semiconductors
… the influence of lattice damage and hydrogen evolution. In particular, hydrogen-induced blistering and crater formation under thermal annealing from T=300-650 degrees Celsius was studied to determine the activation energies in Ge and Si in several crystalline orientations. Similar techniques …
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Anti-plane Shear of Cylinders and Layered Systems: Cohesive Fracture and Instability
… the mechanics of mode-III cohesive fracture by defect initiation and quasi-static growth in both cylinder and layered systems. The analysis, which is exact, is based on the solution of two fundamental elasticity problems: i) a cylinder subject to an arbitrary shear on one end cap and an …