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Soft x‐ray absorption spectroscopy study of oxide layers on titanium alloys
Author(s) -
López M. F.,
Soriano L.,
Palomares F. J.,
SánchezAgudo M.,
Fuentes G. G.,
Gutiérrez A.,
Jiménez J. A.
Publication year - 2002
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1422
Subject(s) - oxide , x ray absorption spectroscopy , materials science , titanium , titanium oxide , layer (electronics) , absorption spectroscopy , absorption (acoustics) , spectroscopy , rutile , titanium alloy , diffusion , metal , spectral line , analytical chemistry (journal) , metallurgy , chemical engineering , alloy , chemistry , composite material , optics , thermodynamics , physics , chromatography , quantum mechanics , astronomy , engineering
Soft x‐ray absorption spectroscopy (XAS) has been used to perform chemical analysis of oxide films formed after contact with air, both at room temperature and at 750° C, on three titanium alloys. The alloys investigated were Ti–13Nb–13Zr, Ti–15Zr–4Nb and Ti–7Nb–6Al. Soft x‐ray absorption spectra were taken at the Ti 2p and O 1s edges. The spectra corresponding to the room‐temperature‐oxidized samples are similar for the three alloys and show the presence of native oxide with a small metallic contribution. For the heat‐treated samples, the alloying elements as well as element diffusion play a significant role in the formation of the oxide layer. In this case, the spectra exhibit clear differences between the TiNbZr alloys and Ti–7Nb–6Al. The oxide layer of the two TiNbZr alloys for the different heat treatment times is composed of TiO 2 in the form of rutile. However, for Ti–7Nb–6Al short heat treatments give rise to the formation of Al 2 TiO 5 . By increasing the oxidation time, an Al 2 O 3 layer grows on the initial oxide film, becoming thicker as the exposure time is enhanced. Copyright © 2002 John Wiley & Sons, Ltd.