Segregation of cerium in chromia scales
作者： D.A. Downham , R.J. Hussey , D.F. Mitchell , M.J. Graham
DOI: 10.1016/B978-0-08-040423-3.50013-6
关键词: Grain boundary diffusion coefficient 、 Electron diffraction 、 Metallurgy 、 Oxide 、 Materials science 、 Cerium 、 Grain boundary 、 Chromia 、 Analytical chemistry 、 Diffusion 、 Sputter deposition
摘要: Abstract The oxidation rate of Fe-Cr alloys at 900-1100°C is significantly decreased by the presence a thin (~40A) sputter coating Ce02. 18O/SIMS experiments show that Ce found within scale changes mechanism Cr2O3 growth from predominantly cation to anion diffusion, both which are considered occur along oxide grain boundaries. For oxides > 1000 A thick, EDX, EELS, TEM and electron diffraction data indicate segregates form particles CeCr03 likely retard boundary diffusion Cr cations. Analogous results observed for Y203-coated Y-implanted alloys.
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