High temperature scaling of binary Fe-Y alloys in pure oxygen

Citation
Ys. Li et al., High temperature scaling of binary Fe-Y alloys in pure oxygen, HIGH TEMP M, 18(3), 1999, pp. 185-195
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
HIGH TEMPERATURE MATERIALS AND PROCESSES
ISSN journal
0334-6455 → ACNP
Volume
18
Issue
3
Year of publication
1999
Pages
185 - 195
Database
ISI
SICI code
0334-6455(199902)18:3<185:HTSOBF>2.0.ZU;2-W
Abstract
The scaling of two iron-based alloys containing 15 and 30wt% yttrium as wel l as of pure yttrium has been studied at 600-800 degrees C in 1 atm of pure O-2. Both alloys formed external scales containing a mixture of iron and y ttrium oxides plus double Fe-Y oxides followed by a region of internal oxid ation of yttrium, so that the oxidation of iron could not be prevented. Cor rosion of the two alloys was generally irregular and occurred at rates not very different from those of oxidation of pure iron. No yttrium depletion w as observed in the alloys beneath the region of internal oxidation, in spit e of the much larger stability of Y2O3 with respect to iron oxides. The sca ling behavior of the two alloys is interpreted by taking into account the l imited solubility of yttrium in iron.