In:
Defect and Diffusion Forum, Trans Tech Publications, Ltd., Vol. 289-292 ( 2009-4), p. 541-550
Abstract:
The oxidation mechanism of FeCrAl (+RE), RE: reactive elements: Y and Hf) thin foils was studied at temperatures ranging from 1093 K to 1173 K in SO2+1%O2 atmosphere. Materials were subjected to isothermal and thermal cycling exposures as well as to the so-called two-stage-oxidation. In the latter, an oxygen isotope 18O2 was used as a tracer. Starting materials and scales were characterized using Grazing Angle X-Ray Diffraction (GA-XRD), EDX, SEM, XPS and High Spatial Resolution Secondary Ion Mass Spectrometry (HSR-SIMS). The obtained results showed within the studied range of exposure conditions the scales on all the studied alloys grow via outward mechanism typical for transient oxides and not for the -Al2O3 which is consistent with phase composition results and scale morphology and/or microstructure. It was also found that ‘as received’ foils are not bare metals but complex oxide-on-metal systems resulting from their manufacturing procedure.
The obtained results are discussed in terms of the diffusion-related transport properties of the scale and of the scale phase composition.
Type of Medium:
Online Resource
ISSN:
1662-9507
DOI:
10.4028/www.scientific.net/DDF.289-292
DOI:
10.4028/www.scientific.net/DDF.289-292.541
Language:
Unknown
Publisher:
Trans Tech Publications, Ltd.
Publication Date:
2009
detail.hit.zdb_id:
2051135-8
