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http://hdl.handle.net/11375/7744
Title: | Metal and oxygen activities in the Fe-Ni-O and Ni-Cr-O systems between 900°C and 1100°C |
Authors: | Davies, Haydn |
Advisor: | Smeltzer, W. W. |
Department: | Metallurgy and Materials Science |
Keywords: | Materials Science and Engineering;Metallurgy;Materials Science and Engineering |
Publication Date: | May-1973 |
Abstract: | <p>This thesis concerned with the experimental determinations of the thermodynamic parameters describing the Fe-Ni-O and Ni-Cr-O ternaries between 900°C and 1100°C.</p> <p>Equilibrium oxygen pressures for Fe-Ni and Ni-Cr allows equilibrated with their oxides have been measured by an electrochemical cell with a calcia stabilised zirconia electrolyte. These pressures were related to compositional determinations of the solid phases, using an electron probe microanalyser, and correlated with the ternary isotherms. Both the Fe-Ni-O and Ni-Cr-O systems have been described by equilibrium oxygen pressure diagrams which relate oxyren activity to the compositions of the equilibrated phases.</p> <p>The variation of metal activities with alloy composition for Fe-Ni and Ni-Cr alloys has been determined between 900°C and 1100°C. Spinel-alloy equilibria in the Fe-Ni-O system have been described by a Gibba-Duhem calculation and by a structural model for the spinel based on a lattice point defect model.</p> <p>Experimental observations of the scales formed on Fe-Ni-Cr alloys are qualitatively discussed with respect to thermodynamic considerations.</p> |
URI: | http://hdl.handle.net/11375/7744 |
Identifier: | opendissertations/3000 4018 1431873 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
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fulltext.pdf | 4.3 MB | Adobe PDF | View/Open |
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