Rondón Brito , David E. (2019) Efectos de irradiación con iones en aleaciones de aluminio / Irradation effects in aluminium alloys. Maestría en Ingeniería, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
En este trabajo de investigación se estudió el efecto de la irradiación de iones He"+ de 20 keV para diferentes tasas y dosis acumulada de daño (DPA), en muestras de Aluminio de alta pureza. Para caracterizar el daño producido en los materiales irradiados se emplearon las Microscopías: de Fuerza Atómica (AFM) y Electrónica de Barrido (SEM) y de Transmisión convencional (TEM) y de Alta Resolución (HRTEM). Para el caso de Al de alta pureza el principal efecto que se observó fue la formación de ampollas en superficie, las cuales son producidas por la implantación y acumulación de Helio sub-superficial. Al aumentar la dosis se observó la ruptura de las ampollas y la formación de nuevas generaciones de éstas. Por otro lado, se observó en su interior la formación de burbujas de Helio con diámetros entre 1 y 3 nm. Para altas dosis de daño las burbujas presentaron bordes facetados, formando octaedros truncados. Tanto las ampollas como las burbujas presentaron una distribución uniforme en el material. A modo de mejorar la resistencia del material a la irradiación se procedió a preparar y estudiar una aleación Al-Cu-Si-Ge con una alta densidad de precipitados metaestables de dimensiones nanométricas. Se realizaron experimentos de irradiación bajo las mismas condiciones que para el Aluminio de alta pureza. Para este caso se observó una total inhibición de las burbujas de Helio y una significativa reducción del ampollado. Este último efecto se pudo apreciar solamente en la vecindad de precipitados de la fase de equilibrio Al_2Cu localizados en bordes de grano. Por lo tanto la distribución de ampollas en la superficie resultó inhomogénea. Tanto para el Al puro como para la aleación Al-Cu-Si-Ge daño generado aumentó con la dosis, mas no presentó dependencia con la tasa de irradiación o corriente iónica.
Resumen en inglés
In this research work we studied the effect of irradiation with 20 keV He"+ ions at different displacement rates and cumulative doses of damage (DPA), on samples of high purity Aluminum and an Al-Cu-Si-Ge alloy. To characterize the surface damage produced in the irradiated materials, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) were used. On the other hand, Standard Transmission (TEM) and High Resolution Electron Microscopy (HRTEM) were used to characterize the volume damage (inside the material). For the case of high purity Al, the main effect observed on the surface was the generation of blisters, which are produced by the implantation and accumulation of subsurface Helium. When increasing the dose, blister rupture followed by the formation of new generations of blisters was observed. On the other hand, the formation of Helium bubbles within the volume of the material with diameters between 1 and 3 nm was observed. At high doses, bubbles exhibited faceted edges with truncated octahedron morphology. Both surface and volumetric damage were uniformly distributed throughout the material. In order to improve the resistance of the material to the irradiation, an alloy of Al-Cu-Si-Ge with a high density of nanosized precipitates was prepared and studied. Irradiation experiments under the same conditions as those chosen for high purity aluminum were carried out. For this case, a total inhibition of the Helium bubbles and a significant reduction of the blistering were observed. This last effect appears mainly in the vicinity of equilibrium phase Al_2Cu precipitates located on the matrix grain boundaries. Therefore, the distribution of blisters on the surface was inhomogeneous. The damage generated increased with dose, but no dependence on displacement rate, or ionic current, was observed.
| Tipo de objeto: | Tesis (Maestría en Ingeniería) |
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| Palabras Clave: | Irradiation; Irradiación; Aluminium; Aluminio; Helium; Helio; [Atomic force microscope; Microscopio de fuerza atómica; Scanning electron microscope; Microscopio electrónico de barrido; Transmission electron microscope; Microscopio electrónico de transmisión] |
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A method for thin foil thickness determination by transmission electron microscopy. Applied Surface Science, 254 (1 SPEC. ISS.), 420-424, 2007. 61 |
| Materias: | Ingeniería nuclear |
| Divisiones: | Investigación y aplicaciones no nucleares > Física > Física de metales |
| Código ID: | 903 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 22 Mar 2021 10:35 |
| Última Modificación: | 12 Abr 2021 12:31 |
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