This title appears in the Scientific Report :
2003
Please use the identifier:
http://dx.doi.org/10.3184/096034003782750097 in citations.
Transient Oxidation of Alumina Forming Ti-Al-Ag-based Alloys and Coatings Studied by SEM, AFM, XPS and LRS
Transient Oxidation of Alumina Forming Ti-Al-Ag-based Alloys and Coatings Studied by SEM, AFM, XPS and LRS
gamma-TiAl based intermetallics possess poor oxidation properties at temperatures above approximately 700degreesC. Previous studies showed that protective alumina scale formation on gamma-TiAl can be obtained by small additions (around 2 at.%) of Ag. Recently, this type of materials has therefore be...
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Personal Name(s): | Niewolak, L. |
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Lawson, K. / Rossbach, P. / Wessel, E. / Shemet, V. / Nicholls, J. / Singheiser, L. / Quadakkers, W. J. | |
Contributing Institute: |
Werkstoffstruktur und Eigenschaften; IWV-2 |
Published in: | Materials at high temperatures, 20 (2003) S. 631 - 637 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2003
|
Physical Description: |
631 - 637 |
DOI: |
10.3184/096034003782750097 |
Document Type: |
Journal Article |
Research Program: |
Werkstoffsysteme für Kraftwerke |
Series Title: |
Materials at High Temperatures
20 |
Subject (ZB): | |
Publikationsportal JuSER |
gamma-TiAl based intermetallics possess poor oxidation properties at temperatures above approximately 700degreesC. Previous studies showed that protective alumina scale formation on gamma-TiAl can be obtained by small additions (around 2 at.%) of Ag. Recently, this type of materials has therefore been proposed as oxidation resistant coatings for high strength TiAl alloys. In the present study, a number of cast Ti-Al-Ag alloys and magnetron sputtered Ti-Al-Ag coatings were investigated in relation to transient oxide formation in air at 800degreesC. After various oxidation times the oxide composition, microstructure and morphology were studied by combining a number of analysis techniques, such as SEM, ESCA, AFM and LIOS-RS. The gamma-TiAl-Ag alloys and coatings appear to form an alpha-Al2O3 oxide scale from the beginning of the oxidation process, in spite of the relatively low oxidation temperature of 800degreesC. The formation of metastable alumina oxides seems to be related to the presence of Ag-rich precipitates in the alloy matrix. |