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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 361 to 370 of 2614 (0.031 seconds)Spelling suggestions: "subject:"bickel,"" "subject:"dickel,""
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Using elastic energy considerations to explain rafting in Ni-based superalloys with a high gamma volume fractionCress, Catherine Marion January 1993 (has links)
A Dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, for the Degree of Master of Science / A simple three-dimensional model of a high y' volume fraction Ni-based alloy is developed.
The model is based on the idea that a unit volume in the superalloy can be represented by
a cuboidal precipitate with thin 'slabs' of matrix material 'stuck' onto its faces in such a
way that coherency is maintained. Rafting is investigated by considering the changes in total energy whon the cuboidal precipitates start to flatten into plate shapes or lengthen into rod shapes. It is assumed that inelastic effects are negligible.
Internal and external stresses and strains are determined. Expressions for the derivative of the total energy with respect to a shape parameter are then calculated in the absence of
applied stress and in the presence of applied stress. Predictions of rafting behaviour are made for six alloys. Excellent agreement is found with experimental evidence but it is suggested that the agreement is fortuitous. / AC 2018
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| 362 |
Comparison of Joining Processes for Haynes 230 nickel Based Super AlloyWilliston, David Hugh 17 August 2013 (has links)
Haynes 230 is a nickel based, solid-solution strengthened alloy that is used for high-temperature applications in the aero-engine and power generation industries. The alloy composition is balanced to avoid precipitation of undesirable topologically closedpacked (TCP) intermetallic phases, such as Sigma, Mu, or Laves-type, that are detrimental to mechanical and corrosion properties. This material is currently being used for the NASA's J2X upper stage rocket nozzle extension. Current fabrication procedures use fusion welding processes to join blanks that are subsequently formed. Cracks have been noted to occur in the fusion welded region during the forming operations. Use of solid state joining processes, such as friction stir welding are being proposed to eliminate the fusion weld cracks. Of interest is a modified friction stir welding process called thermal stir welding. Three welding process: Gas Metal Arc Welding (GMAW), Electron Beam Welding (EBW), and Thermal Stir Welding (TSWing) are compared in this study.
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| 363 |
Aryl mesylates in nickel (0) catalyzed homo- and cross coupling reactionsBae, Jin-Young January 1995 (has links)
No description available.
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| 364 |
A Meta-Regression Analysis of Nickel-Induced Carcinogenicity: Effect of Nickel Concentration and Species on Lung and Nasal Cancer Mortality in Nickel Refinery WorkersVincent, Melissa J. 28 October 2013 (has links)
No description available.
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| 365 |
The decomposition of formic acid vapor on evaporated nickel films /Walton, Dean Kirkland January 1956 (has links)
No description available.
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| 366 |
The oxides and oxidation of molybdenum-nickel alloys /Larsen, William Lawrence January 1956 (has links)
No description available.
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| 367 |
The complexes of iron(II), cobalt(II), and nickel(II) with ligands containing the conjugated methine group /Stoufer, Robert Carl January 1959 (has links)
No description available.
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| 368 |
Anodic polarization behavior of iron-nickel alloys in sulfuric acid solutions /Economy, George January 1960 (has links)
No description available.
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| 369 |
The characterization of the crack growth behaviour of alloy IN-100 at elevated temperature under sustained load /Donat, Robert Charles January 1980 (has links)
No description available.
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| 370 |
The guest-host properties of some novel nickel(II) and cobalt(II) vaulted macrocyclic host compounds /Takeuchi, Kenneth James January 1981 (has links)
No description available.
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