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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the 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.
161

SPECIFIC PERMEABILITIES OF METALLIC COLUMNAR STRUCTURES AT LOW LIQUID-VOLUME FRACTIONS (MACROSEGREGATION, LEAD-TIN ALLOY, DENDRITIC).

Koegel, David Eric. January 1985 (has links)
No description available.
162

Internal oxidation in iron and nickel base alloys.

Burg, Michelle L, Materials Science & Engineering, Faculty of Science, UNSW January 2007 (has links)
The internal oxidation behaviour of Ni-base and Fe-base alloys containing approximately 5 at% Al and both with and without low concentration Cr additions in flowing low-oxygen atmospheres at 1273 K was studied. There were two groups of Febase alloys; ferritic alloys that were Fe-Al-Cr and others that also contained approximately 9.3 at% Ni in order to make them austenitic. Ni?base alloys were oxidised in oxygen partial pressures of either 4.6 ?? 10-11 atm or 9.8 ?? 10-13 atm and Febase alloys were oxidised in an oxygen partial pressure of 1.2 ?? 10-16 atm The aim of this investigation was to examine the effect of internal oxidation on Fe- and Ni-base alloys containing Al or Al with Cr. The morphology of the precipitates formed and rates of reaction were of interest. Oxidation of the ferritic Fe-base alloys produced internal oxidation only at lower solute concentrations. In these alloys steady state diffusion-controlled precipitation was prevented from occurring due to the formation of an oxide barrier at the reaction front, and cracking off of the internal oxidation zone. In all of the austenitic alloys (Ni-base and y-Fe-base) internal oxidation was observed after all exposures. In y-Fe-base alloys and in Ni-base alloys oxidised at the higher oxygen partial pressure (4.6 ?? 10-11 atm) precipitation zones were found to widen according to parabolic kinetics, indicating diffusion control. In Ni-base alloys oxidised at 9.8 ?? 10-13 atm, precipitation zones were observed to widen according to parabolic kinetics up to 40.9 hours. However, the rate slowed for longer reaction times due to coalescence of precipitates at the reaction front. The rate of internal oxidation decreased with increasing Cr, and thus total solute, concentration. The parabolic rate constants measured for internal oxidation were higher than predicted by Wagner's theory of internal oxidation, which is consistent with observations in previous studies. Kinetics were accelerated by the presence of elongated precipitates, aligned approximately normal to the alloy surface. Chromium alloy additions led to precipitate coarsening, and at lower oxygen partial pressures, to loss of elongated morphology. The precipitates formed were found to be a mixture of M2O3 and AM2O4, where M represents either Al or Cr, and A represents either Fe or Ni. Both oxide forms were detected at all depths within the internal oxidation zone. However, Cr-containing oxides were limited to the part of the internal oxidation zone closer to the alloy surface, while Al-containing oxides were present at all depths. This is consistent with thermodynamic predictions.
163

Probabilistic fatigue crack life prediction in a directionally-solidified nickel superalloy

Highsmith, Shelby, January 2003 (has links) (PDF)
Thesis (M.S. in M.S.E.)--School of Materials Science and Engineering, Georgia Institute of Technology, 2004. Directed by W. Steven Johnson. / Includes bibliographical references (leaves 141-148).
164

Solidification cracking resistance of high strength aluminum alloys

Paramatmuni, Rohit K., January 2003 (has links)
Thesis (M.S.)--West Virginia University, 2003. / Title from document title page. Document formatted into pages; contains xi, 71 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 53-56).
165

The micrograin plasticity of eutectic lead-bismuth alloy

Sypher, George Edward, 1935- January 1970 (has links)
No description available.
166

The superplasticity of eutectic lead-bismuth alloy

Lo, Chien-ming, 1941- January 1967 (has links)
No description available.
167

Local environment dependence of magnetic moment in Ni-Cu alloys

Medina, Rodrigo Arocha 08 1900 (has links)
No description available.
168

The effect of alloy composition on the deformation behavior and the tensile properties of Al-3Li-X alloys

Kujore, Adesola Oludotun 05 1900 (has links)
No description available.
169

Shock-activated reaction synthesis and high pressure response of Ti-based ternary carbide and nitride ceramics

Jordan, Jennifer Lynn 05 1900 (has links)
No description available.
170

The role of alloy composition and cooling rate from the melt on the dispersoid distribution in AA 6013

Conte-Matos, Augusto 05 1900 (has links)
No description available.

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