Relevant bibliographies by topics / Zr – 1 %Nb alloy

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Academic literature on the topic 'Zr – 1 %Nb alloy'

Author: Grafiati
Published: 28 May 2022
Last updated: 29 May 2022

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Journal articles on the topic "Zr – 1 %Nb alloy"

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Eroshenko, A. Yu, Yu P. Sharkeev, M. A. Khimich, et al. "Affect of prolonged thermal exposure on microstructure and mechanical properties of ultrafine-grained bioinert Zr - 1 wt. % Nb and Ti - 45 wt. % Nb alloys." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 11 (2020): 9–16. http://dx.doi.org/10.17223/00213411/63/11/9.

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The results for thermal stability of the microstructure and mechanical properties of ultrafine-grained alloys Zr-1 wt. % Nb and Ti-45 wt. % Nb alloys after long-term thermal annealing at temperature of 400°C are presented. It is shown that in the Zr-1 wt.%Nb alloy in the ultrafine-grained state, increase in the annealing duration from 5 to 360 hours leads to growth of the structural elements (grains, sub-grains, fragments) of the matrix phase a - Zr and the particles β-Nb. This fact is due to the processes of recrystallization. It leads to softening of the alloy and decrease of microhardness and yield stress. It was also found that annealing up to 360 hours does not affect the size of the structural elements of the matrix β-phase in the Ti-45 wt. % Nb alloy, but contributes to the noticeable growth of the α-phase and ω-phase grains. According to our results, softening of the Ti-45 wt. % Nb alloy and decrease in its mechanical characteristics are associated with the processes of return at the grain boundaries, as well as with growth of the nanoscale grains of α-phase and ω-phase and decrease in their contribution to dispersion hardening.
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Olsson, C. O. A., and D. Landolt. "Anodisation of a Nb–Zr alloy." Electrochimica Acta 48, no. 27 (2003): 3999–4011. http://dx.doi.org/10.1016/s0013-4686(03)00540-1.

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Hua, Z., B. Zuo, Y. M. Sun, X. N. Wang, L. R. Dong, and B. Li. "Crystallization processes and magnetic properties of Fe78Co2Zr8Nb2B10-xGex (x = 0, 1, 2, 3) amorphous alloys." Modern Physics Letters B 28, no. 20 (2014): 1450160. http://dx.doi.org/10.1142/s0217984914501607.

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Fe 78 Co 2 Zr 8 Nb 2B10-x Ge x (x = 0, 1, 2, 3) amorphous alloys were prepared by melt-spinning and annealed at different temperatures. The microstructures and magnetic property were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM), respectively. The crystallization processes of Fe 78 Co 2 Zr 8 Nb 2 B 10 amorphous alloy at different quenching rates are similar and complex. The α- Fe ( Co ) and α- Mn type phases are observed in their initial stage of crystallization process. Hc increases with increasing annealing temperature in general. Only α- Fe ( Co ) phase is observed in the initial stage of the crystallization processes of Fe 78 Co 2 Zr 8 Nb 2 B 10-x Ge x (x = 0, 1, 2, 3) alloys. The change trend of coercivity is complex compared with Ge -free samples. The magnetic property of Fe 78 Co 2 Zr 8 Nb 2 B 7 Ge 3 is better.
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Gunderov, Dmitry, Andrey Stotskiy, Yuri Lebedev, and Veta Mukaeva. "Influence of HPT and Accumulative High-Pressure Torsion on the Structure and Hv of a Zirconium Alloy." Metals 11, no. 4 (2021): 573. http://dx.doi.org/10.3390/met11040573.

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The authors previously used the accumulative high-pressure torsion (ACC HPT) method for the first time on steel 316, β-Ti alloy, and bulk metallic glass vit105. On low-alloyed alloys, in particular, the zirconium alloy Zr-1%Nb, the new method was not used. This alloy has a tendency to α → ω phase transformations at using simple HPT. When using ACC HPT, the α → ω transformation can be influenced to a greater extent. This article studies the sliding effect and accumulation of shear strain in Zr-1%Nb alloy at various stages of high-pressure torsion (HPT). The degree of shear deformation at different stages of HPT was estimated. The influence of various high-pressure torsion conditions on the micro-hardness and phase composition by X-ray diffraction (XRD) of Zr-1%Nb was analyzed. It is shown that at high-pressure torsion revolutions of n = 2, anvils and the specimen significantly slip, which is a result of material strengthening. It was found that despite sliding, regular high-pressure torsion resulted in the high strengthening of Zr-1%Nb alloy (micro-hardness more than doubled), and after high-pressure torsion n = 10, up to 97% of the high-pressure ω-phase was formed in it (as in papers of other researchers). Accumulative high-pressure torsion deformation leads to the strongest transformation of the Zr-1%Nb structure and Hv and, therefore, to a higher real strain of the material due to composition by upsetting and torsion in strain cycles.
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Elkin, Maxim A., Alexey S. Kiselev, and Mikhail S. Slobodyan. "Pulsed laser welding of Zr 1%Nb alloy." Nuclear Engineering and Technology 51, no. 3 (2019): 776–83. http://dx.doi.org/10.1016/j.net.2018.12.016.

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Todai, Mitsuharu, Keisuke Fukunaga та Takayoshi Nakano. "Athermal ω Phase and Lattice Modulation in Binary Zr-Nb Alloys". Materials 15, № 6 (2022): 2318. http://dx.doi.org/10.3390/ma15062318.

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To further explore the potential of Zr-based alloys as a biomaterial that will not interfere with magnetic resonance imaging (MRI), the microstructural characteristics of Zr-xat.% Nb alloys (10 ≤ x ≤ 18), particularly the athermal ω phase and lattice modulation, were investigated by conducting electrical resistivity and magnetic susceptibility measurements and transmission electron microscopy observations. The 10 Nb alloy and 12 Nb alloys had a positive temperature coefficient of electrical resistivity. The athermal ω phase existed in 10 Nb and 12 Nb alloys at room temperature. Alternatively, the 14 Nb and 18 Nb alloys had an anomalous negative temperature coefficient of the resistivity. The selected area diffraction pattern of the 14 Nb alloy revealed the co-occurrence of ω phase diffraction and diffuse satellites. These diffuse satellites were represented by gβ + q when the zone axis was [001] or [113], but not [110]. These results imply that these diffuse satellites appeared because the transverse waves consistent with the propagation and displacement vectors were q = <ζ ζ¯ 0>* for the ζ~1/2 and <110> directions. It is possible that the resistivity anomaly was caused by the formation of the athermal ω phase and transverse wave. Moreover, control of the athermal ω-phase transformation and occurrence of lattice modulation led to reduced magnetic susceptibility, superior deformation properties, and a low Young’s modulus in the Zr-Nb alloys. Thus, Zr-Nb alloys are promising MRI-compatible metallic biomaterials.
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Pang, Shujie, Tao Zhang, Katsuhiko Asami, and Akihisa Inoue. "Formation, corrosion behavior, and mechanical properties of bulk glassy Zr–Al–Co–Nb alloys." Journal of Materials Research 18, no. 7 (2003): 1652–58. http://dx.doi.org/10.1557/jmr.2003.0227.

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Bulk glassy Zr55Al20–xCo25Nbx (x = 0 to 5 at.%) alloys with critical diameters of 2.5–5 mm and supercooled liquid region of 48–75 K were produced by copper-mold casting. These alloys were spontaneously passivated in 3 mass% NaCl and 1 N H2SO4 solutions. The addition of Nb to the alloy enhanced the pitting corrosion resistance in the NaCl solution and enabled the open-circuit potential in the H2SO4 solution. Zr- and Al-enriched passive films formed on the bulk glassy Zr–Al–Co–Nb alloys exposed to air and on those immersed in the solutions. The increase in Nb content of the alloys resulted in an increase in Zr and Nb concentrations and a decrease in Al concentration of the passive film. The Vickers hardness, Young's modulus, compressive fracture strength, fracture strain, and plastic strain of the bulk glassy Zr–Al–Co–Nb alloys were 550, 98 GPa, 2100 MPa, 2.9%, and 0.9%, respectively.
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Liu, Qiang, Dongyan Ding, and Congqin Ning. "Anodic Fabrication of Ti-Nb-Zr-O Nanotube Arrays." Journal of Nanomaterials 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/240346.

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Highly ordered Ti-Nb-Zr-O nanotube arrays were fabricated through pulse anodic oxidation of Ti-Nb-Zr alloy in 1 M NaH2PO4containing 0.5 wt% HF electrolytes. The effect of anodization parameters and Zr content on the microstructure and composition of Ti-Nb-Zr-O nanotubes was investigated using a scanning electron microscope equipped with energy dispersive X-ray analysis. It was found that length of the Ti-Nb-Zr-O nanotubes increased with increase of Zr contents. The diameter and the length of Ti-Nb-Zr-O nanotubes could be controlled by pulse voltage. XRD analysis of Ti-Nb-Zr-O samples annealed at 500°C in air indicated that the (101) diffraction peaks shifted from 25.78° to 25.05° for annealed Ti-Nb-Zr-O samples with different Zr contents because of larger lattice parameter of Ti-Nb-Zr-O compared to that of undoped TiO2.
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Belozerova, A., S. Belozerov, and V. Shamardin. "MULTIDIMENSIONAL DATA ANALYSIS BASED ON THE RESULTS OF NUCLEAR TRANSMUTATION CALCULATIONS IN ZIRCONIUM ALLOYS." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2020, no. 1 (2020): 25–36. http://dx.doi.org/10.55176/2414-1038-2020-1-25-36.

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The effects of nuclear transmutation in zirconium alloys are considered. The calculated scheme of transmutation of elements in alloys of the system [Zr + x% Nb + y% Mo] is determined. Numerical estimates of the molybdenum content in zirconium alloys of various compositions were carried out during irradiation in research (SM-3, BOR-60) and power (VVER-1000, PWR) reactors. The dynamics of the accumulation of molybdenum during irradiation in the SM reactor and the subsequent exposure of the samples for one year in standard zirconium alloys Zr + 1% Nb, Zr + 2.5% Nb and for the proposed initial compositions Zr + 1% Nb + 0.5% Mo were estimated Zr + 2.5% Nb + 0.5% Mo. Reactor irradiation leads to a significant accumulation of molybdenum in the Zr + 2.5% Nb alloy as a result of nuclear reactions: the molybdenum concentration increases to about 0.7 % with an increase in neutron fluence (E> 0.1 MeV) to 1×1023 cm-2 at irradiation in a research reactor SM. The dynamics of the effects of nuclear transmutation of zirconium upon irradiation in the active zone of research (SM-3, BOR-60) and power (VVER-1000, PWR) reactors is estimated. The Zr element transmutes no more than 10 % in 100 years of exposure. The accumulation of molybdenum over the same time can be up to 104 ppm (appm). The results of the intellectual analysis of the calculations performed with multidimensional analysis based on OLAP of the multidimensional data space of the database provide knowledge in the form of classifications and confirm the need to develop zirconium alloys with additional doping with molybdenum, which can provide optimal physicomechanical properties, in particular, radiation growth characteristics, as well as acceptable level of nuclear-physical and corrosive properties.
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Poletika, T. M., V. I. Danilov, G. N. Narimanova, O. V. Gimranova, and L. B. Zuev. "Plastic flow localization upon stretching Zr-1% Nb alloy." Technical Physics 47, no. 9 (2002): 1125–29. http://dx.doi.org/10.1134/1.1508076.

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Dissertations / Theses on the topic "Zr – 1 %Nb alloy"

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Mats, V. O., O. M. Morozov, V. G. Kulish, V. I. Zhurba, O. V. Mats, and S. V. Ivanova. "Effects of Cold Deformation and Electron Irradiations on Deuterium Desorption Temperature Range from Zr – 1 %Nb Alloy." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35123.

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The explored warm-up ranges of desorption ion-implanted deuterium from Zr – 1 %Nb alloy, with different structure: after crystallization from melt, plastic deformation and irradiations electron. Cool deformation under 300 K Zr – 1 %Nb alloy with degree   3.9 has allowed to reach the nanostructure conditions in alloy with average size crystallite d  61 nm, high three-dimensional concentration of the borders (~ 3,4 %) and significant level microstrain that in spectrum of thermodesorption ion-implanted deuterium was shown as additional low temperature area thermodesorption deuterium within the range of the temperature 770-1000 K. Irradiation electron to energy 10 MeV by fluence ~ 6 × 1017 cm – 2 has brought about active development of the revocable processes in nanostructure alloy: reduction of the average grain size d  58 nm, increase to concentrations of the borders (~ 8,8 %) and appearance additional peaks in spectrum of thermodesorption deuterium with the temperature 700 and 800 K and, accordingly, increase the warmup range desorption deuterium toward reduction of the temperature. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35123
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Materne, Alex. "Elaboration et caractérisation d'alliages amorphes ferromagnétiques doux, Co(1-x)Zr(x) et Co(1-x)(Zr, Nb)x, pour l'application aux têtes intégrées de l'enregistrement magnétique." Grenoble 1, 1987. http://www.theses.fr/1987GRE10131.

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Caracterisation de couches minces cozr et co(zr,nb) deposes par pulverisation cathodique en radio-frequences. Etude de l'anisotropie developpee aux faibles et fortes pressions de depot. Discussion relative a l'origine de ces anisotropies. Etude du controle de la direction et de l'intensite du champ d'anisotropie par application de recuits sous champ magnetique tournant suivis de recuits sous champ magnetique fixe
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Dubinskiy, Sergey. "Ti-Nb-(Zr,Ta) superelastic alloys for medical implants : thermomechanical processing, structure, phase transformations and functional properties." Mémoire, École de technologie supérieure, 2013. http://espace.etsmtl.ca/1266/1/DUBINSKIY_Sergey.pdf.

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Le but de ce projet est de développer une nouvelle classe de matériaux d'implants orthopédiques, qui combinerait une excellente biocompatibilité du titane pur avec une compatibilité biomécanique exceptionnelle d'alliages à mémoire de forme Ti-Ni. Les candidats les plus appropriés pour un tel rôle sont les alliages à mémoire de forme Ti-Nb-Zr et Ti-Nb-Ta de type beta métastable. Cette classe de matériaux a été développée tout récemment et l'influence du traitement thermomécanique sur leur structure et leurs propriétés fonctionnelles ne faisaient pas encore objet d'aucune étude approfondie. Par conséquent, ce projet est axé sur les relations entre la composition, la microstructure et les propriétés fonctionnelles des alliages superélastiques Ti-Nb-Zr et Ti-Nb-Ta pour applications biomédicales. L'objectif principal est d'améliorer les propriétés fonctionnelles de ces alliages, plus particulièrement les propriétés superélastiques et la résistance à la fatigue, grâce à l'optimisation de la composition des alliages et de leur traitement thermomécanique. Premièrement, cette thèse prouve que la structure et les propriétés fonctionnelles des alliages à mémoire de forme à base de Ti-Nb peuvent être efficacement contrôlées par un traitement thermomécanique, y compris par la déformation à froid suivie de traitement thermique de recuit et de vieillissement. Il est également démontré que la formation d’une structure nano sous-granulaire mène à une amélioration significative de la superélasticité et de la résistance à la fatigue de ces alliages. L'influence du vieillissement sur la cinétique de précipitation de la phase ω et, par conséquent, sur les propriétés fonctionnelles des alliages Ti-Nb-Zr et Ti-Nb-Ta est également observée. Basant sur les résultats obtenus, les régimes du traitement thermomécanique optimisé résultant en une meilleure combinaison des propriétés fonctionnelles sont recommandés pour chaque alliage, d’un point de vue de matériau pour implants orthopédiques. Deuxièmement, un dispositif de traction miniature pour une étude in situ à basse température dans la chambre d’un diffractomètre à rayons X a été développé et utilisé. Une étude comparative sur les caractéristiques des transformations et de l'évolution du réseau cristallin dans des conditions du contrôle de déformation et de balayage en température entre -150 et +100oC a été réalisée in situ. Les paramètres de la maille cristalline des phases β et α” ont été calculés dans une plage de température étudiée, ce que nous a permis de conclure que plus la température est élevée, plus la déformation qui accompagne la transformation des phases α”→β est faible. On a également constaté que le chargement à basse température mène à la formation additionnelle et la réorientation de la phase α”, tandis que l'application de la charge lors du chauffage modifie la séquence des transformations. L’élargissement et le rétrécissement réversible des pics de la phase β qui sont observées lors du balayage en température sont le résultat direct de l’apparition et de la disparition des micro-contraintes causées par la transformation martensitique thermoélastique réversible.
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Botta, Filho W. J. "Mechanical properties of Nb-N, Nb-Zr and Nb-ZrOsub(2) single crystals." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355724.

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Mello, Fabia Zampieri D'Antola de. "Avaliação da biofuncionalidade dos implantes da liga Ti-35Nb-7Zr comparado aos implantes comerciais de Ti-Cp." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/97/97134/tde-20112017-165628/.

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A Ti-35Nb-7Zr é uma liga Ti-&szlig; desenvolvida pelo Grupo de Biomateriais da Escola de Engenharia de Lorena da Universidade de São Paulo, que demonstrou, em estudos anteriores, propriedades mecânicas favoráveis para ser usada como biomaterial, tais como, limite de resistência (~800 Mpa), resistência à corrosão e baixo módulo de elasticidade (33 GPa). Uma vez que o implante dentário traz melhores resultados no tocante à função mastigatória, fonação, conforto e estética, melhorando a qualidade de vida das pessoas, o presente estudo descreve a avaliação da biofuncionalidade dos implantes dentários da liga Ti-35Nb-7Zr comparados aos implantes comerciais de Ti-Cp da marca Titaniumfix. A biofuncionalidade foi avaliada por meio de testes in vitro e in vivo. A avaliação in vitro foi realizada com células mesenquimais indiferenciadas retiradas da medula óssea de fêmures de ratos, que foram cultivadas em meio de cultura osteogênico e posteriormente realizados os testes de citotoxicidade, quantificação de proteína total e avaliação da atividade da fosfatase alcalina. A avaliação in vivo compreendeu a realização de implantes de Ti-Cp Titaniumfix e da liga Ti-35Nb-7Zr em tíbias de coelhos para avaliação histológica, histomorfométrica por meio do cálculo da Fração da área óssea ocupada (BAFO) e aposição óssea, e de remoção ao torque com intuito de avaliar a osteointegração. Considerando os resultados obtidos nesta pesquisa, com relação aos testes in vitro, é possível concluir que a liga possui maior hidrofilicidade que o Ti-Cp; apresenta espraiamento celular similar ao Ti-Cp o que corrobora para o resultado de viabilidade celular classificando-a como não citotóxica. Nos testes de quantificação de proteína total e atividade da fosfatase alcalina a liga apresenta resultados similares ao Ti-Cp, favorecendo a ocorrência de diferenciação e proliferação das células osteoblásticas. Desta forma, pode-se concluir que a liga possui boa compatibilidade in vitro. Os resultados obtidos nas avaliações in vivo, por meio da fração de área óssea ocupada (BAFO), comprovam a semelhança entre a liga e o Ti-Cp pois tiveram o valor percentual de osso neoformado similar. A análise de fluorescência, após a administração dos marcadores tetraciclina e alizarina, mostra que a aposição óssea também foi semelhante entre a liga e o Ti-Cp nos períodos estudados. Com relação a força de interação avaliada pelo torque de remoção é possível afirmar que a liga apresenta osteointegração comparável aos implantes comerciais Ti-Cp. Esses resultados demonstraram que os implantes da liga Ti-35Nb-7Zr apresentaram biocompatibilidade e biofuncionalidade semelhantes ao dos implantes de Ti-Cp. Além de possuir um baixo módulo de elasticidade, a liga apresentou uma osteointegração bem similar ao Ti-Cp, reunindo características que demonstram seu potencial para ser usada como biomaterial intraósseo.<br>Ti-35Nb-7Zr is a Ti-&szlig; alloy developed by the Biomaterials Group of the Lorena School of Engineering of the University of São Paulo, which demonstrated, in previous studies, favorable mechanical properties to be used as biomaterial, such as resistance (~800 Mpa), corrosion resistance and low modulus of elasticity (33 GPa). Since the dental implant brings better results regarding masticatory function, phonation, comfort and aesthetics, improving the quality of life of the people, the present study describes the evaluation of the biofunctionality of the Ti-35Nb-7Zr ally dental implants compared to the Titaniumfix implants of Ti-Cp. The biofunctionality was evaluated by means of in vitro and in vivo tests. The in vitro evaluation was perfomed with undifferentiated mesenchymal cells removed from the bone marrow of rat femurs, which were cultured in osteogenic culture medium and subsequently perfomed cytotoxicity tests, total protein quantification and evaluation of alkaline phosphatase activity. The in vivo evaluation included the implantation of Ti-Cp Titaniumfix and Ti-35Nb-7Zr alloy implants in rabbit tibiae for histological, histomorphometric evaluation by calculating the Bone Area Fractional Occupied (BAFO) and bone apposition, and torque removal in order to evaluate the osseointegration. Considering the results obtained in this research, related to in vitro tests, it is possible to conclude that the alloy has a higher hydrophilicity than Ti-Cp; Show cellular spreading similar to Ti-Cp, which corroborates the result of cell viability classifying it as non-cytotoxic. In the tests of total protein quantification and alkaline phosphatase activity the alloy presents results similar to Ti-Cp, favoring the occurrence of differentiation and proliferation of osteoblastic cells. In this way, it can be concluded that the alloy has good compatiblity in vitro. The results obtained in the in vivo evaluations, through the BAFO, confirm the similarity between the alloy and Ti-Cp, since they had the percentage value similar to neoformed bone. Fluorescence analysis, after administration of the tetracycline and alisarin markers, show that bone apposition was also similar between the alloy and Ti-Cp in the periods studied. Regarding the interaction force evaluated by the removal torque, it is possible to affirm that the alloy show osseointegration comparable to commercial Ti-Cp implants. These results demonstrated that Ti-35Nb-7Zr alloy implants had similar biocompatibility and biofunctionality to Ti-Cp implants. In addition to having a low modulus of elasticity, the alloy presented an osseointegration very similar to Ti-Cp, bringing together characteristics that demonstrate its potential to be used as an intraosseous biomaterial.
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Merino, Rafael Alejandro Cajacuri. "Propriedades magnéticas dos compostos de Laves Hf (Fe(1-x)Cr(x))2 e (Nb(1-x)Zr(x)) Fe2." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-23042009-000241/.

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O objeto desta pesquisa consiste em investigar as propriedades estruturais, magnéticas e hiperfinas dos compostos pseudobinários de fases de Laves: Hf(Fe(1-x)Cr(x))2 e (Nb(1-x)Zr(x))Fe2. Para o Hf(Fe(1-x)Cr(x))2, preparamos as amostras como ligas policristalinas e as fundimos por síntese nas concentrações: x = 0,0; 0,1; 0,2; 0,3; 0,4; 0,5; 0,6; 0,7; 0,8; 0,9 e 1,0. O mesmo foi feito para as amostras de (Nb(1-x)Zr(x))Fe2 nas concentrações x = 0,0; 0,1; 0,2; 0,3; 0,4 e 0,5. Todas as amostras fundiram-se num forno de fusão de arco, sob atmosfera de argônio ultrapuro (99.999%). Em seguida investigamos a estrutura cristalina das ligas pelo método do pó, com a técnica de difratometria de Raios X (XRD), obtendo-se os parâmetros de rede e confirmando-se a estrutura de fase hexagonal C14 para as amostras Hf(Fe(1-x)Cr(x))2 nas concentrações 0,0 <= x < 0,9, bem como em todas as outras amostras de (Nb(1-x)Zr(x))Fe2. Depois, determinamos as propriedades magnéticas das ligas Hf(Fe(1-x)Cr(x))2 pela técnica de magnetização a baixas temperaturas em baixos campos magnéticos aplicados de 0 a 7 T e em altos campos magnéticos aplicados de 0 a 16 T. As suscetibilidades AC e DC a baixos campos magnéticos com temperaturas de 4,2 K a 300 K, FC e ZFC, nos indicaram que as ligas de concentrações 0,4 <= x < 0,8 apresentam comportamento \'vidro de spin\', sendo que em x <= 0,3 são aglomerados magnéticos com interação de curto alcance e em x = 0,9 é um superparamagnético. Por tanto, os valores dos momentos magnéticos por átomo de Fe foram calculados para todas as amostras. As medidas de spectroscopia Mössbauer das mesmas amostras de Hf(Fe(1-x)Cr(x))2, na temperatura ambiente, apresentam dois sextetos para a mostras com x = 0,2 e dois dubletos quadrupolares para as demais composições, atribuídos aos sítios cristalográficos 2a e 6h do Fe. Por outra parte, os espectros Mössbauer das amostras de (Nb(1-x)Zr(x))Fe2 à temperatura de 4,2 K, sem campo magnético aplicado e com campo magnético aplicado de 6 e 12 T, sugerem que estes compostos se encontram em um balanço em que coexistem as fases ferromagnéticas e antiferromagnéticas. Finalmente, notamos que no composto (Nb0.6Zr0.4)Fe2 há, uma possível existência de comportamento paramagnético nos Fe do sítio cristalino 2a e, ao mesmo tempo, pouca certeza que o valor do momento magnético seja nulo neste sítio cristalino.<br>The object of this research consists of investigating the structural, magnetic and hiperfine properties of the pseudobinar Laves phases compounds Hf(Fe(1-x)Cr(x))2 and (Nb(1-x)Zr(x))Fe2. We prepared polycristaline samples alloys and for synthesis melting in the concentrations: x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 e 1.0, for the Hf(Fe(1-x)Cr(x))2 and in the concentrations: x = 0.0, 0.1, 0.2, 0.3, 0.4 e 0.5 for (Nb(1-x)Zr(x))Fe2. We melted them in an arc furnace under pure Argon (99.999%) gas atmosphere. We investigated the cristaline structure of the alloys by the powder XRD technique, obtaining lattice parameters and confirming the structure of hexagonal phase C14 for the samples Hf(Fe(1-x)Cr(x))2 in the concentrations 0.0 <= x <= 0.9 and also in all the other samples produced of (Nb(1-x)Zr(x))Fe2. We investigate the magnetic properties of Hf(Fe(1-x)Cr(x))2 alloys bye the technique of magnetization at low temperatures and low magnetic field applied until 7 T and high magnetic field applied until 16 T. The susceptibility AC and DC at low magnetic fields and temperatures of 4.2 K until 300 indicated that alloys of concentrations 0.4 <= x < 0.8 show spin glass behavior, in x <= 0.3 they are magnetic clusters with short range interactions, and in x = 0.9 is superparamagnetic. The values of the magnetic moments for atom of Fe were calculated for all samples. We measured Mössbauer spectra of the same samples of Hf(Fe(1-x)Cr(x))2 at room temperature, obtaning two sextets for the samples with x < 0.2 and two quadrupolar doublets for the other compositions, that would be attributed to the cristalographic sites 2a and 6h. Also the Mössbauer spectrum of the samples (Nb(1-x)Zr(x))Fe2 at temperature of 4.2 K without magnetic field applied and with magnetic field applied of 6 and 12 T, suggest that those compounds show coexisting ferromagnetic and antiferromagnetic phases. We could note for the compound (Nb0.6Zr0.4)Fe2 a possible existence of the paramagnetic behavior in the Fe of the cristalographic site 2a, but the magnetic moment in this site is not zero.
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Figueira, Luis Carlos Querido. "Um estudo sobre a aplicação da liga Nb-1%Zr em sistemas nucleares espaciais : comportamento sob tratamentos térmicos." Instituto Tecnológico de Aeronáutica, 1991. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1830.

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O objetivo deste trabalho foi estudar a influência de diferentes tratamentos térmicos na microestrutura da liga Nb-1%Zr. Os corpos de prova foram obtidos a partir de uma barra com aproximadamente 68% de deformação a frio. Antes dos tratamentos térmicos foram feitas medidas de dureza (HRB) em todas as amostras e, ainda, microscopia óptica, fluorescência e difração de RX e análise por EDX em algumas amostras. Adotou-se o seguinte esquema nos tratamentos térmicos: dividiu-se as amostras em 4 grupos de 4 amostras cada; para cada grupo fixou-se uma temperatura de tratamento (entre 1200 e 1500oC) e em cada grupo deixou-se uma amostra 2h, e as outras 4, 6 e 8h no patamar. Seguiu-se resfriamento ao forno. Devido à forte interação entre o nióbio e suas ligas com a atmosfera acima de aproximadamente 450oC, os tratamentos térmicos foram realizados sob vácuo de 1,33x10-3 Pa (10-5 Torr). Fazendo-se a comparação entre os testes antes e depois dos tratamentos térmicos foi possível estudar-se a influência dos parâmetros tempo e temperatura de tratamento térmico na microestrutura da liga Nb-1%Zr.
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Sobol, O. V., A. A. Andreev, and V. Gorban. "Structural-Strained State and Mechanical Characteristics of Single-Phase Vacuum-Arc Coatings of Multicomponent High Entropy System Ti-V-Zr-Nb-Hf and Nitrides Based On It." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34808.

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In this work was shown the high stability of the single-phase structural state of high entropy alloy of Ti-V-Zr-Nb-Hf system in a vacuum-arc method of obtaining of coatings based on it. In the process of deposition single-phase high entropy coatings with bcc-lattice which characterizes the cast state are formed in vacuum, and upon obtaining in a nitrogen atmosphere single-phase nitride superhard coatings based on fcc-metal lattice are formed. Such a stability of structure of multi-element alloy to high temperature evaporation and deposition from high-energy plasma flows allows to use the techniques developed for simple substitution phases in the analysis of their structural-stress state. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34808
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O'Mara, Duncan F. "Effect of heating rate to test temperature on superplastic response in an A1-8%Mg-1%Li-0.2%Zr alloy." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/25872.

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The effect of heating rate to tension test temperature on superplastic response in an Al-8%Mg-1%Li-0.2% Zr alloy was studied. A thermomechanical process (TMP) was used that involved warm rolling with controlled reheating between rolling passes. During the TMP, microstructural evolution was controlled by a continuous reaction (CRX). In this work, superplastic response was studied using five heating rates, ranging from 7.1X10-3 C/s to 2.4 x 10+1 C/s, following TMP. Heating rates greater than 10 C/s resulted in a discontinuous reaction (DRX) with a likely coarsening of grain size. Conversely, high ductilities and enhancement of superplasticity resulted from slower heating rates (1 deg C/s) that facilitated recovery and CRX in a microstructure already highly refined by CRX during the TMP. Heating rate studies; Aluminum-magnesium-lithium the alloys; Superplastic
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Templeton, Alan. "Studies of bismuth vanadate (Bi←4V←2O←1←1) and BiMeVOX (Me=W'6'+, Ta'5'+, Nb'5'+, Zr'4'+ and Ti'4'+) materials." Thesis, University of Aberdeen, 1996. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU528242.

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The oxide ion conductor bismuth vanadate (Bi<sub>4</sub>V<sub>2</sub>O<sub>11</sub>) can be doped with various metal cations, <I>Me<sup>2+</sup></I> to <I>Me<sup>6+</sup></I>; <I>Me </I>partially substitutes for vanadium to produce a new family of solid electrolytes known as <I>BiMeVOX</I> (<I>Bis</I>muth <I>Me</I>tal <I>V</I>anadium <I>Ox</I>ides. Bi<sub>4</sub>V<sub>2</sub>O<sub>11</sub> is polymorphic having three forms α, β and γ; the high temperature form (γ) has high oxygen ion conductivity of comparable magnitude to existing solid electrolytes such as YSZ; however, this occurs at high temperatures (> 560°C). Doping Bi<sub>4</sub>V<sub>2</sub>O<sub>11</sub> with <I>Me</I> ions, leads to stabilisation of the γ-phase to room temperature, thus producing a material with promising practical applications. The parent material, Bi<sub>4</sub>V<sub>2</sub>O<sub>11</sub>, is a non-stoichiometric phase forming a limited solid solution given by Bi<sub>4+y</sub>V<sub>2-y</sub>O<sub>11-y</sub>; by virtue of the variable Bi:B ratio this leads to a range of compositions for the <I>BiMeVOX</I> materials and hence the overall formula Bi<sub>4-y</sub>V<sub>2-x-y</sub><I>Me<sub>x</sub></I>O<sub>11-y-σ</sub>. Thus, there is scope for a range of γ-phase compositions. The aims of this study were to - (1) investigate the Bi<sub>4+y</sub>V<sub>2-y</sub>O<sub>11-y</sub> solid solution and formation of stoichiometric Bi<sub>4</sub>V<sub>2</sub>O<sub>11</sub> (i.e. <I>y</I> = 0); (2) optimise synthesis conditions of <I>Me</I>-doped Bi<sub>4</sub>V<sub>2</sub>O<sub>11</sub> (Me = W<sup>6+</sup>, Ta<sup>5+</sup>, Nb<sup>5+</sup>, Zr<sup>4+</sup> and Ti<sup>4+</sup>); (3) determine the compositional extent of each solid solution formed by using a variety of diffraction, thermal and microscopic techniques; (4) investigate stabilisation, to room temperature, of the high temperature gamma (γ) phase, formed on doping Bi<sub>4</sub>V<sub>2</sub>O<sub>11</sub>; (5) elucidate possible substitution mechanisms and initiate a crystallographic study of gamma phase materials. <I>Bi<sub>4</sub>V<sub>2</sub>O<sub>11</sub></I> : It is shown that stoichiometric Bi<sub>4</sub>B<sub>2</sub>O<sub>11</sub> does not form, via solid state reaction, without precipitation of BiVoO<sub>4</sub> (scheelite) as secondary phase; a slight excess of Bi (y ≈ 0.02) is required to form single phase material in this system.
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Books on the topic "Zr – 1 %Nb alloy"

1

Centre, Bhabha Atomic Research. Development of Nb-1% Zr-0.1%C alloy as structural components for CHTR. Bhabha Atomic Research Centre, 2011.

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Titran, Robert H. Creep strength of niobium alloys, Nb-1%Zr and PWC-11. National Aeronautics and Space Administration, Lewis Research Center, 1989.

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Saibaba, N. Microstructural studies of heat treated Zr-2.5 Nb alloy for pressure tube applications. Bhabha Atomic Research Centre, 2010.

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Khatamian, D. Hydrogen traps in the oxide/alloy interface region of Zr-Nb alloys. Reactor Materials Research Branch, Chalk River Laboratories, 1995.

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Glass, David E. Start up of a NB-1%Zr potassium heat pipe from a frozen state. Available from from National Technical Information Service, 1998.

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Moore, Thomas J. The effect of electron beam welding on the creep rupture properties of a Nb-Zr-C alloy. National Aeronautics and Space Administration, 1986.

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Srivastava, D., and Dinesh Srivastava. Microstructural examination of Zr-2.5%Nb pressure tube S-07 from Kakrapar atomic power station unit-2. Bhabha Atomic Research Centre, 2011.

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O'Mara, Duncan F. Effect of heating rate to test temperature on superplastic response in an A1-8%Mg-1%Li-0.2%Zr alloy. Naval Postgraduate School, 1989.

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Yegorova, L. A. Data base on the behavior of high burnup fuel rods with Zr-1% Nb cladding and UO2 fuel (VVER Type) under reactivity accident conditions. U.S. Nuclear Regulatory Commission, 1999.

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Processing and microstructure of Nb-1%Zr-0.1%C alloy sheet. National Aeronautics and Space Administration, 1993.

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Book chapters on the topic "Zr – 1 %Nb alloy"

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Kawazoe, Yoshiyuki, Ursula Carow-Watamura, and Dmitri V. Louzguine. "Thermal properties of Cu-Nb-Ni-Zr alloy." In Phase Diagrams and Physical Properties of Nonequilibrium Alloys. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-57920-6_39.

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Kawazoe, Yoshiyuki, Ursula Carow-Watamura, and Dmitri V. Louzguine. "Thermal properties of Fe-Nb-Ni-Zr alloy." In Phase Diagrams and Physical Properties of Nonequilibrium Alloys. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-57920-6_53.

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Kawazoe, Yoshiyuki, Ursula Carow-Watamura, and Dmitri V. Louzguine. "Thermal properties of Mo-Nb-Ni-Zr alloy." In Phase Diagrams and Physical Properties of Nonequilibrium Alloys. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-57920-6_64.

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Kawazoe, Yoshiyuki, Ursula Carow-Watamura, and Dmitri V. Louzguine. "Thermal properties of Nb-Ni-Si-Zr alloy." In Phase Diagrams and Physical Properties of Nonequilibrium Alloys. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-57920-6_67.

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Kawazoe, Yoshiyuki, Ursula Carow-Watamura, and Dmitri V. Louzguine. "Thermal properties of Nb-Ni-Sn-Zr alloy." In Phase Diagrams and Physical Properties of Nonequilibrium Alloys. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-57920-6_69.

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Kawazoe, Yoshiyuki, Ursula Carow-Watamura, and Dmitri V. Louzguine. "Thermal properties of Nb-Ni-V-Zr alloy." In Phase Diagrams and Physical Properties of Nonequilibrium Alloys. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-57920-6_73.

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Kawazoe, Yoshiyuki, Ursula Carow-Watamura, and Dmitri V. Louzguine. "Thermal properties of Nb-Ni-Y-Zr alloy." In Phase Diagrams and Physical Properties of Nonequilibrium Alloys. Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-57920-6_74.

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Sun, Wei. "Decomposition of a Biocompatible Zr-Ta-Nb Alloy." In Materials Science Forum. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-462-6.1525.

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Loureiro, S. A., Daniel Fruchart, Sophie Rivoirard, Dílson S. dos Santos, and L. M. Tavares. "Synthesis, Hydrogenation and Mechanical Milling of Pseudo-Binary Zr(NbxV1-x)2 (0≤x≤0.65) Alloys." In Metastable and Nanostructured Materials III. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-474-x.45.

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Li, Zhongkui, Wen Sheng Wang, J. J. Zhang, and L. Zhou. "Creep Resistance of Zr-Sn-Nb-Fe-Cr Alloy." In Materials Science Forum. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.1405.

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Conference papers on the topic "Zr – 1 %Nb alloy"

1

Uz, Mehmet, and Robert H. Titran. "Processing and microstructure of Nb-1% Zr-0.1% C alloy sheet." In Proceedings of the tenth symposium on space nuclear power and propulsion. AIP, 1993. http://dx.doi.org/10.1063/1.43076.

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ARBUZ, Alexandr, Anna KAWALEK, Kirill OZHMEGOV, Nurgul DANIYEVA, and Evgeniy PANIN. "OBTAINING OF UFG STRUCTURE OF Zr-1% Nb ALLOY BY RADIAL-SHEAR ROLLING." In METAL 2020. TANGER Ltd., 2020. http://dx.doi.org/10.37904/metal.2020.3485.

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Perlovich, Yuriy, Margarita Isaenkova, Vladimir Fesenko, Olga Krymskaya, and Alexander Zavodchikov. "Deformation Mechanisms in Tube Billets from Zr-1%Nb Alloy under Radial Forging." In THE 14TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2011. AIP, 2011. http://dx.doi.org/10.1063/1.3589549.

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Bhardwaj, Purvee, Faisal Shareef, Madhu Sarwan, V. Thakre, and Sadhna Singh. "Structural and elastic properties of Zr[sub x]Nb[sub 1−x]C alloy." In SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4790912.

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Mairambekova, A., A. Eroshenko, M. Bannikov, O. Naimark, and Yu Sharkeev. "Fracture characteristics of titanium VT1-0 and Zr–1 wt. % Nb alloy in different structures under gigacycle fatigue loading regime." In PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083427.

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Xu, Steven X., Dennis Kawa, Jun Cui, and Heather Chaput. "Validation of Weight Function Based Process-Zone Model for Evaluation of Delayed Hydride Cracking Initiation in Zr-2.5Nb Pressure Tubes." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-64024.

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In-service flaws in cold-worked Zr-2.5 Nb pressure tubes in CANDU(1) reactors are susceptible to a phenomenon known as delayed hydride cracking (DHC). The material is susceptible to DHC when there is diffusion of hydrogen atoms to a service-induced flaw, precipitation of hydrides on appropriately oriented crystallographic planes in the zirconium alloy matrix material, and development of a hydrided region at the flaw tip. The hydrided region could then fracture to the extent that a crack forms and DHC is said to have initiated. Examples of in-service flaws are fuel bundle scratches, crevice corrosion marks, fuel bundle bearing pad fretting flaws, and debris fretting flaws. These flaws are volumetric in nature. Evaluation of DHC initiation from the flaw is a requirement of Canadian Standards Association (CSA) Standard N285.8. This paper describes the validation of the weight function based process-zone model for evaluation of pressure tube flaws for DHC initiation. Validation was performed by comparing the predicted threshold load levels for DHC initiation with the results from DHC initiation experiments on small notched specimens. The notches in the specimens simulate axial in-service flaws in the pressure tube. The validation was performed for both un-irradiated and pre-irradiated pressure tube material.
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Scarth, Douglas, Steven Xu, and Cheng Liu. "Engineering Process-Zone Model for Evaluation of Structural Strength of Fuel Channel Annulus Spacers in CANDU Nuclear Reactors." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-66194.

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The core of a CANDU(1) (CANada Deuterium Uranium) pressurized heavy water reactor consists of a lattice of either 390 or 480 horizontal Zr-Nb pressure tubes, depending on the reactor design. These pressure tubes contain the fuel bundles. Each pressure tube is surrounded by a Zircaloy calandria tube that operates at a significantly lower temperature. Fuel channel annulus spacers maintain the annular gap between the pressure tube and calandria tube throughout the operating life. To meet this design requirement, annulus spacers must have adequate structural strength to carry the interaction loads imposed between the pressure tube and calandria tube. Crush tests that have been performed on specimens from as-received and ex-service Inconel X-750 alloy spacers have demonstrated that the structural strength of Inconel X-750 spacers has degraded with operating time due to irradiation damage. There was a need for an engineering model to predict the future maximum load carrying capacity of the spacer coils for use in Fitness-for-Service evaluations of spacer structural integrity. An engineering process-zone model has been developed and used to analyze the spacer crush test results, and provide predictions of the Inconel X-750 spacer coil future maximum load carrying capacities. The engineering process-zone model is described in this paper. The process-zone model is based on the strip-yield approach of a process zone with a uniform restraining stress representing the fracture region that is surrounded by elastic material.
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Wang, Xu, Jun Tan, Liutao Chen, et al. "Stability of SPPs in Zirconium Alloy CZ2 Under Self-Ion Irradiation." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67128.

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Zr-Nb zirconium alloy was developed at CNPRI and designated as CZ2. In this paper, the composition, size distribution and crystal structure of second phase particles (SPPs) in CZ2 have been analyzed under transmission electron microscopy (TEM). Two types of SPPs were observed in CZ2, which are bcc β-Nb and hcp Zr-Nb-Fe. To study the radiation effects on SPPs, CZ2 in two different heat treatment conditions CZ2-SRA (stress relieved) and CZ2-RXA (recrystallized) were irradiated with 3 MeV Zr++ up to 1.14×1016 Zr/cm2 (50 dpa at the damage peak) at three different temperatures 320°C, 360°C and 400°C in Texas A&amp;M University. Commercial low-tin Zr-4 was also irradiated at the same condition as a reference. The results show that the SPPs of Zr-4 become completely amorphous after irradiation at 320°C and 360°C, while retain crystalline at 400 °C. SPPs of CZ2-RXA are partially disordered only after irradiation at 320°C. The crystal structure of SPPs in CZ2-SRA survived at all temperatures.
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Uz, Mehmet, and Robert H. Titran. "Thermal stability of the microstructure of an aged Nb-Zr-C alloy." In Proceedings of the eighth symposium on space nuclear power systems. AIP, 1991. http://dx.doi.org/10.1063/1.40030.

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Horak, James A., Martin L. Grossbeck, Michael M. Paxton, Mohamed S. El-Genk, and Mark D. Hoover. "Effects of Irradiation on the Tensile Properties of Nb-1 Zr." In SPACE NUCLEAR POWER AND PROPULSION: Eleventh Symposium. AIP, 1994. http://dx.doi.org/10.1063/1.2950210.

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Reports on the topic "Zr – 1 %Nb alloy"

1

Titran, R. H., and M. Uz. Effects of thermomechanical processing on tensile and long-time creep behavior of Nb-1%Zr-0.1%C sheet. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10161712.

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Nobile, A., W. C. Mosley, J. S. Holder, and K. N. Brooks. Deuterium absorption and material phase characteristics of SAES St 198 Zr-Fe Alloy. Revision 1. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10133400.

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