Short Term Oxidation of a Ti-46Al-8Nb Alloy at 700°C in Air

Abstract:

Thermogravimetry was used to study the oxidation behaviour of a lamellar Ti46Al8Nb alloy during holding at 700°C in synthetic air. A parabolic plot of the oxidation kinetics shows three different regimes over the total duration (50 h) of the tests corresponding to decreasing values of the parabolic rate constant. The oxide scale was characterized by glancing-angle X-Ray diffraction and transmission electron microscopy. The scale was found to be bi-layered with an outer part that consists of amorphous aluminium rich oxide whilst the inner layer is made of very small cristalites of titania distributed in the same amorphous oxide.

• Periodical: Materials Science Forum (Volumes 636-637)
• Pages: 485-490
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.636-637.485
• Online since: January 2010
• Authors: Paul Erve T. Ngnekou, Marie Christine Lafont, François Senocq, Jacques Lacaze, Bernard Viguier
• Keywords: Amorphous Oxide, Oxidation, Rutile, Titanium Aluminide Based on TiAl

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