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Microyielding and flow in niobium alloy crystalsWilson, F. Graham January 1969 (has links)
Oriented single crystals of niobium and dilute alloys with molybdenum and tantalum were deformed in tension between 77°K and 500°K, and the macroflow and slip parameters established. At high temperatures the main effect of alloying was to increase the flow stress, considerably more with molybdenum than with tantalum. The observed yield drop and subsequent plastic flow were explained in terms of a stability theory relating changes in yield and work hardening parameters with temperature and addition of solute.
A technique was developed for measuring small plastic strains in the microflow region, and for recording the dynamic transition to macroflow. From studies on pure niobium between 77°K and 295°K, the nature of dislocation motion at small strains was established; microflow was explained in terms of a transition from edge dislocation motion to screw dislocation motion at the macroflow stress. Interstitial effects were found to be particularly significant during microflow, and are probably important in determining the low temperature flow stress in: even the highest purity bcc metals. A further low temperature contribution
comes from a directional component of the internal stress field which depends on the distribution of dislocations rather than on their density.
Microflow curves were obtained for niobium alloy crystals, land the interaction of dislocations with substitutional solute atoms established. In contradiction to previous suggestions, substitutional solute was found to restrict the mobility rather than the multiplication of dislocations. The elastic contribution of solute atoms to the internal stress field was confirmed, although a quantitative theory for bcc alloys does not yet exist.
Peierls stress considerations alone were found to be incapable of explaining either the temperature sensitivity of flow or the low temperature solution softening; the short range interaction of interstitials with the dislocation core was considered to be more significant. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate
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Critical current distributions and the V(1) transition in Nb-Ti superconducting compositesNarang, Girish 16 January 1996 (has links)
It is well established that the extended range V(I) transition behavior in
filamentary superconducting composites depends strongly on the processing
conditions of the composite. Based on previous work, a model proposed by
Warnes et al predicts that the second derivative of the V(I) transition is related to
a more fundamental property the critical current distribution in the composite.
The present work consolidates the said model by showing that in spite of
the V(I) transition being dependent on the matrix resistance, the second
derivative is relatively independent. Also, the second derivative V(I) curve has
been correlated to the critical current distributions and area distributions in
monofilament and multifilamentary superconductors, using image analysis
techniques. The work provides a better understanding of the critical current
distributions in composite superconductors and can be an effective tool for
measuring conductor quality more precisely.
In addition to this, image analysis techniques have been used to study the
effect of processing on the structure of wires - and have been related to the
predictions of a model of inplane stresses in composites. / Graduation date: 1996
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A study of titanium aluminide alloys, rapid solidification, and niobium alloy additionsMishurda, Joseph C. January 1989 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1989. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 291-304).
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Structural characterization and bonding of two niobium disulfur complexes and three iron-selenium cubane-like cluster systems,Roder, Raymond M. January 1973 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1973. / Vita. Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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Superconducting alloy systems of NbSe[subscript 2]Spiering, Glen Allan, January 1966 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1966. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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Amorphization and de-vitrification in immiscible copper-niobium alloy thin filmsPuthucode Balakrishnan, Anantharamakrishnan. Kaufman, Michael Joseph, January 2007 (has links)
Thesis (M.S.)--University of North Texas, May, 2007. / Title from title page display. Includes bibliographical references.
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The dissolution of niobium and zirconium in liquid steelSismanis, Panagiotis G., 1959- January 1987 (has links)
The dissolution rates of niobium and zirconium cylinders in liquid steel have been measured in a 'dynamic way', with the help of a data acquisition and process control facility. Two distinct periods were identified; the steel shell period and the free dissolution period. / Lower bath superheats allowed a reaction to take place at the steel shell/niobium interface while higher superheats didn't; the intermetallic compounds Fe$ sb 2$Nb and Fe$ sb 2$Nb$ sb 3$ were identified as the reaction products. Niobium dissolved relatively slowly in liquid steel and its dissolution speed was increased under dynamic conditions (i.e., inductively stirred baths). / In the case of zirconium, an exothermic reaction occurred at the steel shell/zirconium interface and the intermetallics Fe$ sb 2$Zr and FeZr$ sb 2$ were identified as the reaction products. This reaction was triggered at 1220 K by the formation of a liquid Fe-Zr (76 at% Zr) eutectic. For the experimental conditions under which this study was performed, the hydrodynamic conditions of the steel baths did not seem to influence the dissolution rates of zirconium. / A simplified mathematical model was used in order to simulate the coupled heat and mass transfer phenomena which take place during the two periods.
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The synergistic effect of niobium and boron on recrystallization in hot worked austentite /Mavropoulos, L. T. January 1986 (has links)
No description available.
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Effect of cool deformation on mechanical properties and microstructure of Nb microalloyed steelsFatehi, Arya. January 1900 (has links)
Thesis (M.Eng.). / Written for the Dept. of Mining and Materials Engineering. Title from title page of PDF (viewed 2009/06/17). Includes bibliographical references.
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High temperature oxidation characteristics of Nb-10W-XCr alloysMoricca, Maria del Pilar. January 2009 (has links)
Thesis (Ph. D.)--University of Texas at El Paso, 2009. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.
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