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 20 of 30 for “"Irradiation Damage"”.
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Atomistic studies on irradiation damage in iron
Two topics involving irradiation damage in alpha-iron have been considered. First, damage cascades representative of those that would be induced by radiation have been simulated using molecular dynamics (MD). The number and type of defects produced are compared for pure iron and iron with a small …
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Irradiation damage in neutron-irradiated Fe-Cr model alloys
… resistance to swelling, helium embrittlement and irradiation creep at elevated temperature (T/Tm > 0.4). However, F-M steels exhibit low-temperature irradiation-induced embrittlement that leads to a substantial decrease in toughness at lower irradiation temperature (T < 500°C) even at very low …
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Impact of cellular dislocation structures produced by additive manufacturing on neutron irradiation damage evolution in stainless steel 316L
… features and their potential impact on irradiation-induced damage mechanisms must be studied. Stainless steel 316L (SS-316L) samples were irradiated in the Advanced Test Reactor overa range of fast neutron fluences as part of a grant received by the Colorado School of Mines. …
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Automating radiation damage studies of materials irradiated by high-energy protons using multiphysics simulations
Understanding radiation and corrosion damage in nuclear materials has become increasingly important in reactor design considerations. However, running irradiation damage studies in nuclear reactors is expensive and time-consuming. Thus, accurate, quick simulations have become more attractive to …
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Structural Analysis and Radiation Response of Multi-Walled Boron Nitride Nanotubes
Electron irradiation damage analysis has revealed that: (1) Damage mechanism is different from carbon nanotubes; no radiation induced amorphization was observed, (2) irradiation response of BN nanotubes to 200 keV electrons in TEM environment is almost independent of temperature, (3) under intense …
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Statistical modelling of the transition toughness properties of low alloy pressure vessel steels
… combination of the start of life properties and irradiation damage response of the material. Modelling of the inherent scatter of toughness measurements has received much academic interest since the mid-twentieth century and is found to be dependent on a number of metallurgical factors and …
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Hydrogen embrittlement in nuclear and bearing applications: from quantum mechanics to thermokinetics and alloy design
… through which hydrogen embrittlement and irradiation damage occur in steels and nickel-based alloys respectively, with novel alloys designed for improved resistance. Through the engineering of secondary phases, optimised for helium and/or hydrogen trapping capacity, the novel alloys …
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PROTON IRRADIATION SAMPLE HOLDER II (PISH II)
… in RMTL is used to simulate the radiation damage and changes to materials occurring in a nuclear reactor. Previously, it used the sample holder known as PISH I to hold samples during proton or alpha particle irradiation. The sample holder controls the temperature of the sample along with …
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Microstructural evolution of zirconium carbide (ZrCₓ) ceramics under irradiation conditions
… Carbide (ZrC<sub>2</sub>) ceramics under irradiation conditions is required for their successful implementation in advanced Gen-IV gas-cooled nuclear reactors. The research presented in this dissertation focusses on elucidating the ion and electron irradiation response of ZrC<sub>2</sub> …
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General analysis of breed-and-burn reactors and limited-separations fuel cycles
… for a full core design, including minimum burnup/irradiation damage and reactor fleet doubling time. Two general configurations of B&B reactors are considered: a "minimum-burnup" version in which fuel elements can be shuffled in three dimensions, and a "linear-assembly" version composed of …
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Radiation effects on the blood-brain barrier
Selective vascular irradiation enables the critical examination of the vasculature and its role in the onset of late radiation effects. It is a novel approach to expose the endothelial cells to much higher levels of ionizing radiation relative to normal cells by utilizing the boron neutron capture …
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Diffraction Between the Spots: Scanning Electron Diffraction of Beam-sensitive Disordered Materials
… analysis is done at doses low enough to avoid irradiation damage in the probed beam-sensitive samples.
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The Irradiation Tolerance of Zirconium-based MAX Phases
… that experience high temperatures and irradiation damage. In this work, two newly synthesised zirconium-based MAX phases were investigated for their irradiation tolerance using high energy heavy ions at a variety of temperatures. The response of these materials to irradiation has been …
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Irradiation induced damage in CANDU spacer material Inconel X-750
… application in commercial reactors, accelerated irradiation tests had been conducted in liquid metal fast reactors. Results did not indicate any problem stemming from significant fast neutron irradiation. However, recently it has been found that the ex-service CANDU Inconel X-750 spacers became …
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A Study of the Effects of Irradiation and Radiolytic Oxidation of the Pore-Level Structure of Gilsocarbon Nuclear Graphite
… void structure that occur as a consequence of irradiation damage and radiolytic oxidation, by incorporating a combination of experimental and modelling techniques. Gilsocarbon graphite, which is incorporated in the current UK Advanced gas cooled reactors, is particularly difficult to …
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Fission gas transport and its interactions with irradiation-induced defects in lanthanum doped ceria
… have been extremely productive in understanding irradiation-induced displacement damage in metal and metal alloy systems. In order to help understand the fundamental mechanisms of irradiation-induced defect formation and evolution in nuclear fuel, similar combined modeling and experimental …
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Mechanical properties and influences of irradiation in dilute nanograined aluminum alloys
… are exposed to high temperatures and high irradiation damage levels that can cause mechanical and microstructural instabilities such as creep, embrittlement, void swelling, and so on. If more knowledge regarding how materials behave in such extreme environments becomes available, the …
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Modeling Radiation Damage in Nanostructured Ferritic Alloys: Helium Bubble Precipitation on Oxide Nanofeatures
… heat treatment, resistance to dissolution under irradiation regimes similar to reactor conditions, and ability to trap He bubbles on the nano-oxide surfaces rather than the grain boundary. This KMC model is more complex than others as it includes 5 different atomic species (Fe, Y, Ti, O, and He) …
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Trade-offs between performance and reliability of sub 100-nm RF-CMOS technologies
… concerns such as hot-carrier stress, ionizing irradiation damage, RF stress, temperature effects, and single-event effects are studied. These reliability mechanisms can cause temporary or permanent damage to the semiconductor device and to the circuits using them. Several improvements are made …
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A study of solute transport of radiolysis products in crud and its effects on crud growth on PWR fuel pin
… likely higher, especially through radiolysis and irradiation damage on the cladding. For the modeling of solute transport of radiolysis products, the present analysis considered two competing solute transport mechanisms within the porous crud deposits: molecular diffusion with a source term from …
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