Effect of yttrium additions on the oxidation of nickel

The oxidation of Ni, Ni--0.1Y, and Ni--0.3Y alloys was carried out in the temp. range 500-900 deg C at p sub O2 = 1 atm. Measurements of the oxide scale thickness and the oxide grain size as a function of time are reported. The addition of yttrium to Ni increases the oxidation rate at 500 and 600 de...

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Bibliographic Details
Published in:Oxidation of metals 1985-10, Vol.24 (3-4), p.133-148
Main Authors: MOOSA, A. A, ROTHMAN, S. J
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
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Summary:The oxidation of Ni, Ni--0.1Y, and Ni--0.3Y alloys was carried out in the temp. range 500-900 deg C at p sub O2 = 1 atm. Measurements of the oxide scale thickness and the oxide grain size as a function of time are reported. The addition of yttrium to Ni increases the oxidation rate at 500 and 600 deg C, but decreases it at 700-900 deg C. A model which relates short circuit diffusion and grain growth in the scale to the oxidation process is used and extended. The agreement between the measured values of the grain size and the oxidation rate constant and those calculated from the model is good for Ni and Ni--0.1%Y oxidation and fair for the case of Ni--0.3%Y. In the temp. range of the experiments, it is found that the diffusion of Ni along the grain boundaries in the oxide scale controls the rate of oxidation and that the oxidation kinetics are not parabolic except for Ni at 500 deg C. 27 ref.--AA
ISSN:0030-770X
1573-4889
DOI:10.1007/BF00664229