Texture analyses and microstructural evolution in monolithic U-Mo nuclear fuel

Lemma, Fidelma Giulia Di; Burns, Jatuporn; Madden, James W.; Winston, Alexander; Robinson, Adam; Jue, Jan‐Fong; Keiser, Dennis D.; Cole, James I.

doi:10.1016/j.jnucmat.2020.152677

Cited by 13 publications

(7 citation statements)

References 38 publications

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“…In Table 16, Keiser et al [23] determined the average grain size area for monolithic fuel plates from AFIP6-MKII and RERTR-12. Further research was performed on these samples by Di Lemma et al [134], where electron backscatter diffraction (EBSD) determines the texture of the samples. The results determined that the grain diameter of the RERTR-12 samples was higher than those of AFIP6-MKII, but also the low grain aspect ratio indicates the grains are elongated, which will also impact the efficacy of the grain size measurements [134].…”

Section: As-fabricated Grain Morphologymentioning

confidence: 99%

“…Further research was performed on these samples by Di Lemma et al [134], where electron backscatter diffraction (EBSD) determines the texture of the samples. The results determined that the grain diameter of the RERTR-12 samples was higher than those of AFIP6-MKII, but also the low grain aspect ratio indicates the grains are elongated, which will also impact the efficacy of the grain size measurements [134]. Elongated grains were measured during the characterization of these samples as high as 25 μm [123].…”

Section: As-fabricated Grain Morphologymentioning

confidence: 99%

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Microstructural-Level Fuel Performance Modeling of U-Mo Monolithic Fuel

Beeler

Cole

Kadambi

et al. 2021

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As the physics that governs the microstructural evolution of nuclear fuel span various time and spatial scales, to fully understand the fuel behavior inevitably involves atomic to mesoscale resolution that can be difficult to determine experimentally. Microstructural-level modeling and simulations can be used to develop physics-based materials models that can provide physical understanding to inform fabrication process control, as well as a valuable feedback mechanism between post-irradiation examination (PIE) results and fabrication parameters. In accordance with the program schedule, the primary goals of the microstructure modeling effort are to:1. Address critical microstructural questions and provide practical guidance to the fabricator via the fuel product specification 2. Provide mechanistic inputs for the existing fuel-performance code to improve its descriptive and predictive capability at the macroscopic scale.In fiscal year (FY)-21, the work scope consisted of six main facets: (1) the effect of carbides on fuel performance; (2) gas diffusivity in different phases; (3) integration of microstructural fuel-performance modeling; (4) property degradation; (5) irradiation creep; and (6) historical analysis of microstructure data. Brief summaries of each are included below.

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Section: As-fabricated Grain Morphologymentioning

confidence: 99%

Section: As-fabricated Grain Morphologymentioning

confidence: 99%

Microstructural-Level Fuel Performance Modeling of U-Mo Monolithic Fuel

Beeler

Cole

Kadambi

et al. 2021

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“…Nos contornos dos grãos das amostras deformadas, principalmente nas amostras da liga U7,4Mo, são notadas regiões não indexadas. Lemma e colaboradores observaram regiões não indexadas em ligas U10Mo laminadas e recozidas e atribuíram à decomposição da fase γ [58]. No entanto, neste trabalho, a maior possibilidade de não ocorrer a indexação dessas regiões seja pela preparação de amostras, já que os resultados de difratometria de raios X (Figura 4.12) não mostraram evidências da formação das fases α e γ' (U2Mo).…”

Section: 3unclassified

“…Lemma e colaboradores [58] observaram nos resultados de microtextura obtidos da liga U10Mo laminada a quente, recozida e, por fim, laminada a frio; a presença das fibras α e γ. A formação da fibra α pode ter ocorrido devido ao processamento de laminação a frio após o recozimento.…”

Section: Evolução Da Recristalizaçãounclassified

“…Observa-se a presença das fibras α e γ na FDOC obtida nesse trabalho.Brown et al[57] avaliaram a textura cristalográfica da liga U10Mo laminada a quente, recozida e prensada isostáticamente a quente. Foi observado nesse trabalho, a partir de figuras de pólos inversas, que os planos cristalográficos (111) estavam paralelos à direção normal, sendo um forte indicativo da presença da fibra γ.Lemma e colaboradores[58] apresentaram resultados de textura na liga U10Mo laminada a quente, recozida e, por fim, laminada a frio. A FDOC, calculada a partir de mapas de orientação, evidenciou a presença das fibras α e γ. Nesse trabalho, a liga U10Mo foi irradiada e os resultados obtidos por EBSD foram apresentados.…”

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Texturas cristalográficas em ligas de urânio-molibdênio laminadas a quente e recozidas

Nielsen¹

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NIELSEN, Guilherme F. Crystallographic texture of hot rolled and annealed uranium-molybdenum alloys. 2021. 144 p. Tese (Doutorado em Tecnologia Nuclear) -Instituto de Pesquisas Energéticas e Nucleares -IPEN/CNEN/SP. São Paulo.The Uranium-molybdenum alloys are a good candidate to be used as monolithic nuclear fuel in research, test, and also small power energy nuclear reactors. Hot rolling and annealing processes have been used for the production of monolithic fuels. The fuel production processes can generate crystallographic texture, which can modify the isotropic properties. Based on this, this work studied the preferred crystallographic orientation in hot rolled and annealed U-Mo alloys. The U7.4Mo and U9.5Mo alloys were melted in a vacuum induction furnace and then homogenized, hot rolled, and annealed. The alloys were characterized by optical and electronic microscopies. The crystalline phases were identified by X-ray diffraction. The macrotexture was analyzed by x-ray diffractometry and the microtexture was characterized by EBSD. The as-cast and processed alloys have the gamma phase.The best homogenization condition achieved was 1000 °C for 5 hours. The homogenized treatment showed effective for microsegregation reduction and substantial grain size increase was not observed. The deformed uraniummolybdenum alloys presented α, γ e θ fibers. The intensity of these texture fibers changed with rolling reduction. It was noted that the nucleation of recrystallized grains occurred in preferred locations. Recrystallized grains have crystallographic texture. Upon annealing, it was possible to verify that the microstructure in the annealed samples varies according to the degree of deformation and the annealing time. The deformation generated coincidence site lattice (CSL) grain boundaries.The movement of these special boundaries was observed with annealing.

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