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The effect of microstructure on the fatigue crack propagation behavior of an aluminum-zinc-magnesium-zirconium alloyCoyne, Edward James 05 1900 (has links)
No description available.
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Caracterizacao microestrutural de ligas zirconio-niobio submetidas a tratamentos termomecanicosYAMAUIE, MARCO G. 09 October 2014 (has links)
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05576.pdf: 3566096 bytes, checksum: 80fae754ec990be1f22f772e6969f158 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Caracterizacao microestrutural de ligas zirconio-niobio submetidas a tratamentos termomecanicosYAMAUIE, MARCO G. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:37:55Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:07:06Z (GMT). No. of bitstreams: 1
05576.pdf: 3566096 bytes, checksum: 80fae754ec990be1f22f772e6969f158 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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The dissolution of niobium and zirconium in liquid steelSismanis, Panagiotis G., 1959- January 1987 (has links)
No description available.
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A Study of Self and Solute Diffusion in Pure Zirconium and Dilute Zirconium-Cobalt AlloysKidson, Geoffrey 05 1900 (has links)
<p> The diffusion coefficient of Co has been measured as a function of temperature in the body-centered-cubic phase of 99.99% zirconium. The diffusion rates are extraordinarily large, and follow the relation D = [3.26 ± 2.77] x 10^(-3) exp -(21,820 ± 960/RT) cm^2 /sec
over the range 900 to 1600°C. </p> <p> The Arrhenius plot has a positive curvature above 1600°C. The influence of cobalt additions on the diffusion of 95 ZR and 60 Co in dilute Zr-Co alloys was studied from 0 -2 at.% cobalt at 933°C. A theoretical model was developed to relate the effect to the solute correlation factor. It is established that diffusion in these systems cannot be accounted for in terms of a vacancy mechanism alone. Other models are discussed. </p> / Thesis / Doctor of Philosophy (PhD)
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Anisotropic mechanical behaviour of a Zr-Sn-Nb-Mo alloySalinas Rodríguez, Armando January 1984 (has links)
No description available.
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Subcritical crack growth in zirconium alloysPaes de Andrade, Arnaldo Homobono January 1982 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE / Vita. / Includes bibliographical references. / by Arnaldo Homobono Paes de Andrade. / Ph.D.
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Microstructural evolution and strengthening mechanisms in Al-Sc and Al-Mg-Sc alloys [electronic resource] /Marquis, Emmanuelle A. January 2002 (has links) (PDF)
Thesis (Ph.D.)--Northwestern University, 2002. / Includes bibliographical references (leaves 191-202).
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Investigação do processo para a reciclagem de cavacos de ligas de zircônio através da consolidação por fusão em forno a arco elétrico de refusão de eletrodos consumíveis sob vácuo (VAR) / Investigation of the process for the recycling of zirconium alloys scraps through the consolidation by melt in vacuum arc remelting (VAR) furnace of consumable electrodesReis, Luis Augusto Mendes dos 10 June 2019 (has links)
Os reatores nucleares de potência refrigerados à água pressurizada (Pressurized Water Reactor - PWR) comumente utilizam pastilhas de dióxido de urânio como o seu combustível nuclear, estas por sua vez são montadas e empilhadas em tubos e tampões de ligas de zircônio (M5, Zirlo, Zircaloy, etc), Na usinagem desses componentes são geradas grandes quantidades de cavacos que estão contaminados com fluido de corte, o armazenamento destes cavacos apresenta riscos de segurança e ambientais por ser um material pirofórico e apresentarem alta área específica. Estas são ligas importadas e por isso é mostrado interesse pela indústria de reciclagem na sua reutilização. Este trabalho apresenta o estudo de um processo de reciclagem e os resultados para buscar, eficiência no processo de limpeza; controle de qualidade; obtenção de eletrodos prensados e a fusão em um forno a arco elétrico sob vácuo (Vacuum Arc Remelting - VAR). O processo de reciclagem se inicia com uma separação magnética de possíveis materiais ferromagnéticos presentes, lavagem do fluido de corte, que é solúvel em água, lavagem com um desengraxante industrial, seguido por um enxágue com fluxo contínuo de água em alta pressão e uma secagem por fluxo de ar quente. A primeira avaliação do processo foi feita por uma análise de fluorescência de raios X por dispersão de energia mostrando impurezas provenientes da mistura com cavacos da usinagem de aços inoxidáveis. Os cavacos foram prensados para a obtenção de eletrodos, para fusão em forno VAR, e para isso foi desenvolvida uma matriz para obtenção de eletrodos. Os eletrodos foram fundidos em um forno VAR de laboratório no Laboratório de Fusão do CECTM IPEN. A fusão dos cavacos é possível e viável em um forno VAR o que reduz em até 40 vezes o volume de armazenamento desse material. / The Pressurized Water Reactor commonly uses uranium dioxide pellets as the nuclear fuel, which are then assembled and stacked in zirconium alloy tubes (M5, Zirlo, Zircaloy) and end capped, in the machining of these components large amounts of chips are generated which are contaminated with cutting fluid. Its storage poses security and environmental risks due to a pyrophoric material. These are imported alloys and so it is shown interest by the recycling industry in its reuse. This paper presents the study of a recycling process and its results to seek efficiency in the cleaning process; quality control; obtaining of the electrodes and melting in a Vacuum Arc Remelting (VAR) furnace. The recycling process begins with a magnetic separation of possible ferromagnetic alloys present, washing out the water-soluble cutting fluid, washing with an industrial degreaser, followed by a rinse with continuous high pressure water flow and a flow drying of hot air. The first evaluation of the process was done by an energy dispersive X-ray fluorescence analysis showing the presence of impurities from the mixture with stainless steel machining chips. The chips were pressed to obtain electrodes to be melted in VAR furnace and for this a matrix was developed to obtain electrodes. The electrodes were melted in a laboratory VAR furnace in the Melt Laboratory at CECTM - IPEN. The melting of the chips is possible and feasible in a VAR furnace that reduces the storage volume of this material by up to 40 times, however, it is necessary to correct the composition of the alloy for the melting of these ingots.
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Chemical vapor deposition and characterization of zirconium tin titanate as a high dielectric constant material for potential electronic applicationsMays, Ebony Lynn, January 2003 (has links) (PDF)
Thesis (Ph. D.)--School of Materials Science and Engineering, Georgia Institute of Technology, 2004. Directed by Meilin Liu. / Includes bibliographical references (leaves 180-190).
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