Spelling suggestions: "subject:"bickel alloys"" "subject:"dickel alloys""
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The oxides and oxidation of molybdenum-nickel alloys /Larsen, William Lawrence January 1956 (has links)
No description available.
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Anodic polarization behavior of iron-nickel alloys in sulfuric acid solutions /Economy, George January 1960 (has links)
No description available.
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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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Computer simulation of carburization corrosion of nickel-base superalloysGhasemi, Hamid-Reza M. R. January 1985 (has links)
A computer model for diffusion-controlled internal precipitation was used to simulate the corrosion behavior of Ni-based superalloys in carburizing atmospheres. The model is based on Crank-Nicholson finite difference solution of the diffusion equation. The code also includes the ternary cross diffusion effect due to substitutional alloying elements that are preferentially oxidized. The model can treat two sets of boundary conditions corresponding to the presence or absence of a protective oxide scale. It accounts for internal precipitation of corrosion products whenever thermodynamic solubility limits are exceeded. Up to four different carbides can be treated simultaneously. The solubility product is computed for each reaction and the amount of carbon that reacts is removed from the diffusion process. Under non-protective conditions, the predictions of model were compared to carburization profiles obtained experimentally in H₂-CH₄ environment tests. Results are presented for the formation of Cr, Mo, Ti, W, and Nb carbides in Ni-based superalloys. The predicted corrosion profiles are in qualitative agreement with experimental data. / Master of Science
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The planar hall effect in thin foils of Ni-Fe alloy丘健倫, Yau, Kin-lun. January 1968 (has links)
published_or_final_version / Physics / Master / Master of Science
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Investigation of the Pt-Al-Cr system as part of the development of the Pt-Al-Cr-Ru thermodynamic databaseSuss, Rainer 03 September 2008 (has links)
The ternary Pt-Al-Cr system was investigated as part of the continued development of a
thermodynamic database for the Pt-Al-Cr-Ru system. Scanning electron microscopy with
energy dispersive X-ray spectroscopy and X-ray diffraction analyses were used to obtain
phase equilibria data. The alloys were studied in the as-cast condition, as well as after
annealing at 600°C and 1000°C respectively. A solidification projection was constructed and
a liquidus surface derived. Isothermal sections at 600°C and 1000°C were also determined. It
was concluded that all phase regions were identified correctly since the results were selfconsistent.
Three ternary phases were found and 19 ternary invariant reactions identified.
A thermodynamic database was developed for the Pt-Al-Cr system using Thermo-Calc. Phase
relations could be reasonably accurately predicted between 600°C and 1000°C, and even up
to temperatures close to the melting point. However, the match between the calculated and
experimental diagrams could be improved. As with the Pt-Cr-Ru system, problems with the
constituting binary systems seemed to be the major cause for problems encountered in the
modelling. Only once the Al-Pt and especially the Cr-Pt and Cr-Ru binary phase diagrams are
confirmed more rigorously, the calculated ternary phase diagrams could be worked on with
more confidence.
More than half of the alloys investigated had hardnesses in excess of 600 HV10 regardless of
their state of heat treatment. Based on the examination of hardness indentations, alloys in the
Pt-Al-Cr system were also often brittle due to the presence of hard intermetallic compounds.
Alloys containing ~Pt3Al showed better behaviour with regard to toughness which was
encouraging for the Pt-based alloys that are being developed by Mintek.
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Optimizing the microstructure of single crystal Ni-base superalloysTabrizi, Narges January 2015 (has links)
No description available.
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First principles investigation of intermetallic phases and defects in Ni-base superalloysEurich, Nikolai Carl January 2015 (has links)
No description available.
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Calculation of magnetocrystalline anisotropySchneider, Gunter 20 January 1999 (has links)
The magnetocrystalline anisotropy energy (MAE) for fcc Ni and bcc Fe is calculated as the difference of single particle energy eigenvalue sums using a tight-binding model. For nickel we predict a MAE of -0.15 eV and the wrong easy axis, for iron we find a MAE of -0.7 eV with the easy axis in agreement with experiment. Our results compare favorably with previously reported first-principles calculations based on density functional theory and the local spin density approximation. The inclusion of an orbital polarization correction improves the magnitude of the MAE for iron, but fails to bring the result for nickel closer to the experimental value. The outstanding feature of our calculations is the careful handling of the necessary Brillouin zone integrals. Linear interpolation schemes and methods based on Fermi surface smearing were used and analyzed. An alternative method of calculating the MAE based on the torque on a magnetic moment centered on an atom is found to be equivalent to the calculation of the MAE in terms of energy differences. / Graduation date: 1999
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Probabilistic fatigue crack life prediction in a directionally-solidified nickel superalloyHighsmith, Shelby, Jr. 01 December 2003 (has links)
No description available.
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