Gijón, Rafael A. (2020) Herramienta de simulación de experimentos de transmisión de neutrones en materiales texturados / Neutron transmission experiments simulation tool in textured materials. Proyecto Integrador Ingeniería Nuclear, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
Cuando un haz de neutrones policromáticos pasa a través de un material cristalino, los neutrones de diferentes energías se atenúan de manera diferente. Como resultado, el espectro de energía del haz de neutrones cambia cuando interactúa con la muestra. Un análisis cuidadoso de la relación de intensidad entre los haces transmitido e incidente proporciona una gran cantidad de información sobre la estructura cristalina y la microestructura de la muestra. En particular, en un experimento de transmisión de neutrones resuelto en energía, un haz colimado de neutrones policromáticos de flujo diferencial I0 (λ) impacta en una muestra y emerge por la cara opuesta con un flujo diferencial I (λ), donde se mide con un detector que permite resolver la longitud de onda de los neutrones. Para los neutrones térmicos y subtérmicos, la relación de la intensidad entre el espectro incidente y el espectro transmitido depende en gran medida de la estructura cristalina y la microestructura del material. La mayoría de los materiales son policristalinos y sus propiedades dependen no solo de la estructura cristalina de cada grano, sino también del estado de agregación. En el caso de los sólidos metálicos, los granos están dispuestos de forma compacta con diferente orientación cristalográfica, diferente estructura cristalina y / o diferente composición química. Dado que las propiedades físicas dependen en gran medida de la orientación de un cristal, la orientación de los granos que componen el material determina el grado de anisotropía de sus propiedades físicas, como el espectro de transmisión. En la mayoría de los materiales, estas orientaciones no son aleatorias y los granos tienen algunas orientaciones preferenciales conocidas como texturas cristalográficas. Esta textura en un material policristalino puede resultar de la deformación plástica, el trabajo mecánico o los tratamientos térmicos durante la fabricación, y cada proceso de trabajo causa distintas distribuciones o texturas preferidas de orientación del grano. En materiales de ingeniería, es común desarrollar una textura controlada durante los procesos de fabricación para optimizar su funcionalidad y optimizar el rendimiento de las piezas. Este Proyecto Integrador presenta una herramienta computacional que simula experimentos de transmisión de neutrones resueltos en energía de materiales con texturas homogéneas. El código incorpora parámetros experimentales, forma de la muestra y textura cristalográfica, para simular el espectro de transmisión en función de la longitud de onda de los neutrones utilizando un modelo para describir la contribución de la componente elástica coherente de la sección eficaz total de neutrones de los materiales texturados. El código se ha implementado haciendo un amplio uso de la biblioteca MTEX.
Resumen en inglés
When a polychromatic neutron beam passes through a crystalline material, neutrons of different energies are attenuated differently. As a result, the energy spectrum of the neutron beam changes when interacting with a sample. A careful analysis of the intensity ratio between the transmitted and incident beams provides a wealth of information about the crystalline structure and microstructure of the sample. In particular, on an energy-resolved neutron transmission experiment, a polychromatic collimated neutron beam of differential flux I0(λ) impacts on a sample and emerges from the other side with a differential flux I (λ), where it is measured by a detector that allows solving the wavelength of the neutrons. For thermal and sub thermal neutrons, the ratio of the intensity between the incident spectrum and the transmitted spectrum is strongly dependent on the crystal structure and microstructure of the material. Most materials are polycrystalline and their properties depends not only on the crystal structure of each grain, but also on the state of aggregation. In the case of metallic solids, the grains are compactly arranged with different crystallographic orientation, different crystal structure and / or different chemical composition. Since the physical properties are highly dependent on the orientation of a crystal, the orientation of the grains that make up the material determine the degree of anisotropy of its physical properties, such us the transmission spectrum. In most materials, these orientations are not random and the grains have some preferential orientations known as crystallographic textures. This texture in a polycrystalline material may result from plastic deformation, mechanical working or thermal treatments during manufacturing, and each working processes cause distinct preferred grain orientation distributions or textures. In engineering materials, it is common to develop a controlled texture during manufacturing processes in order to optimize their functionality and optimize the performance of the pieces. This thesis presents a computational toolbox that simulates energy resolved neutron transmission experiments of homogeneous textured materials. The code incorporates experimental parameters, sample shape and crystallographic texture, to simulate the transmission spectrum as a function of neutron wavelength using a model to describe the contribution of the coherent elastic component of the neutron total cross section of textured materials. The code has been implemented making extensive use of the MTEX library
| Tipo de objeto: | Tesis (Proyecto Integrador Ingeniería Nuclear) |
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| Palabras Clave: | Transmission; Transmisión; Neutrons; Neutrones; Texture; Textura; Crystallography; Cistalografía; Cross section; Secciones eficaces; Polycrystals; Policristales |
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| Materias: | Ingeniería nuclear |
| Divisiones: | Gcia. de área de Energía Nuclear > Gcia. de Ingeniería Nuclear > Física de neutrones |
| Código ID: | 921 |
| Depositado Por: | Marisa G. Velazco Aldao |
| Depositado En: | 07 Jun 2021 12:43 |
| Última Modificación: | 07 Jun 2021 12:43 |
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