This title appears in the Scientific Report :
2003
Please use the identifier:
http://dx.doi.org/10.3184/096034003782748810 in citations.
Time Dependence of Mg-Incorporation in Alumina Scales on FeCrAl Alloys Studies by FIB-Prepared Cross Sections
Time Dependence of Mg-Incorporation in Alumina Scales on FeCrAl Alloys Studies by FIB-Prepared Cross Sections
Minor alloying additions and alloy impurities can be of crucial importance for the protective properties of oxide scales on high temperature alloys. An example of an impurity is magnesium. In the present study, the effect of Mg impurity (concentration 80 ppm) on the oxidation behaviour of a commerci...
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Personal Name(s): | Mayer, J. |
---|---|
Penkalla, H.-J. / Dimyati, A. / Dani, M. / Untoro, P. / Naumenko, D. / Quadakkers, W. J. | |
Contributing Institute: |
Werkstoffstruktur und Eigenschaften; IWV-2 |
Published in: | Materials at high temperatures, 20 (2003) S. 413 - 419 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2003
|
Physical Description: |
413 - 419 |
DOI: |
10.3184/096034003782748810 |
Document Type: |
Journal Article |
Research Program: |
Werkstoffsysteme für Kraftwerke |
Series Title: |
Materials at High Temperatures
20 |
Subject (ZB): | |
Publikationsportal JuSER |
Minor alloying additions and alloy impurities can be of crucial importance for the protective properties of oxide scales on high temperature alloys. An example of an impurity is magnesium. In the present study, the effect of Mg impurity (concentration 80 ppm) on the oxidation behaviour of a commercial FeCrAl alloy at 1200degreesC was investigated. By a combination of various analysis techniques, such as optical metallography, SEM/EDX/WDX, X-ray diffraction and TEM, it was found that Mg appeared to become easily incorporated in the surface oxide already after relatively short exposure times.Comparison of the oxidation products showed a change in the scale growth mechanism to occur in course of the oxidation treatment. Magnesium was found to migrate through the alumina scale and it became enriched in the outer part of the oxide scale forming a layer of a (Mg,Mn)Al2O4 spinel. An important effect associated with the Mg-enrichment and spinet formation was the development of porosity within the scale which may be of great importance for the growth rate and adherence of the protective alumina based scale. |