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Showing 1 to 15 of 15 for “"radiation induced segregation"”.
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Evaluation of radiation induced segregation in Fe-Ni-Cr alloys
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering; and, (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Radiation-Induced Segregation and Precipitation in Ion-Irradiated Molybdenum-Rhenium Alloys
Radiation-induced solute segregation and precipitation in molybdenum-rhenium solid-solution alloys were studied during elevated-temperature helium- and neon-ion irradiation. Radiation-induced segregation of Re atoms in the same direction as the defect fluxes, that is, toward the external surface, …
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Experimental determination of radiation induced segregation susceptibility in austenitic stainless steels
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Mean-Field Parameter Study of Radiation-Induced Segregation in a Binary Metal Alloy
… for understanding the behavior of metals under irradiation to aid in the pursuit of advanced materials for deployment in Generation IV (Gen-IV) nuclear reactor designs. A mean-field study is conducted on a body-centered cubic (BCC) A-B binary metal alloy system. The performance of the simulated …
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Effects of Implanted Solutes and Heavy -Ion Cascades on the Kinetics of Radiation -Induced Segregation in Binary Alloys
Various electron and dual ion irradiations were conducted to investigate the effect of implanted solutes and heavy-ion cascades on the fluxes of freely-migrating defects which drive radiation-induced segregation (RIS) in Ni-9at.%Al and Cu-1at.%Au alloys. To study the effect of solute implantation …
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Impact of grain boundary character on the radiation-induced segregation morphology in proton-irradiated 316L austenitic stainless steel
Radiation-induced segregation (RIS) is a non-equilibrium kinetic phenomenon that occurs as a result of radiation damage and leads to the local depletion or enrichment of atoms at point-defect sinks such as grain boundaries and dislocation loops in metallic alloys. This segregation can be so strong …
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Modeling Radiation Damage in Nanostructured Ferritic Alloys: Helium Bubble Precipitation on Oxide Nanofeatures
… generation of nuclear reactors call for more radiation tolerant materials. One such material, nanostructured ferritic alloys (NFA) are a candidate material for use in cladding. The radiation tolerance of NFAs comes from the high number density of small oxide nanofeatures composed of Y, Ti, and …
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The Influence of Defect-Solute Interactions on Segregation of Au Implanted Into Binary Ni Alloys at Elevated Temperatures
The diffusion behavior of solutes under irradiation in a Ni matrix have been investigated. The behavior of the solutes Si, Be, Ge, and Al were studied by directing a 300 keV Au$\sp+$ beam at the material and observing the resultant profiles of the solutes. The implanted Au was also investigated in …
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Radiation damage in nickel(3) aluminum
… both fundamental and practical aspects of radiation damage. The first is a Transmission Electron Microscopy investigation of cascade damage under heavy ion irradiation; the second is a radiation induced segregation study. For the first topic, the cascade generated damage structure (namely, …
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Integrated environmental degradation model for Fe-Ni-Cr alloys in irradiated aqueous solutions
… in order to account for all factors affecting irradiation assisted stress corrosion cracking. *water chemistry including radiolysis and hydrogen injection *radiation induced segregation of the metal *radiation hardening of the metal *crack tip strain rate of a growing crack *dissolution rate at …
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Compositional modifications in alloys under irradiation
… and subsurface compositions of alloys during irradiation has been investigated theoretically using a phenomenological model that includes preferential sputtering, displacement mixing, radiation-enhanced diffusion, radiation-induced segregation and Gibbsian adsorption. Sample calculations were …
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Radiation-induced microstructural and mechanical property modifications in advanced alloys
… and most importantly, high dose fast neutron irradiation. Upon irradiation, the atoms in metals and alloys undergo successive displacements and point defects are created far exceeding the equilibrium concentrations. The material system is driven into thermodynamic nonequilibrium and the …
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Breaking the bottleneck in radiation materials science with transient grating spectroscopy
… by harsh mechanical, chemical, thermal, and irradiation environments that present a challenge for the materials engineer. Nuclear materials research and development is a subject of managing constraints: a component must be proven to retain its integrity in the reactor environment for the …
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Multiscale Modeling of Effects of Solute Segregation and Oxidation on Grain Boundary Strength in Ni and Fe Based Alloys
… focused on multiscale modeling of the effects of radiation-induced solute segregation and oxidation on grain boundary (GB) strength in nickel-based and iron-based alloys. Besides the atomistic scale density functional theory (DFT) based calculations of GB strength, continuum-scale cohesive zone …
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Development and characterization of nanostructured steels and high entropy alloys for nuclear applications
… environment including high temperatures and radiation fluences. In order to extend the lifetime of current light water reactors (LWRs) and realize the development of advanced Gen IV nuclear reactors new materials must be developed which can withstand such an environment. This thesis involves …