MATEC Web Conf.
Volume 321, 2020The 14th World Conference on Titanium (Ti 2019)
|Number of page(s)||8|
|Published online||12 October 2020|
The nitrogen effect on the oxidation behaviour of Ti6242S titanium-based alloy: contribution of atom probe tomography
a CIRIMAT laboratory, University of Toulouse, CNRS, INPT, UPS, ENSIACET 4 allée Emile Monso, BP-44362, 31030 Toulouse Cedex 4, FRANCE
b Aix-Marseille Université, CNRS, IM2NP, Faculté de Saint-Jérôme, Case 142, 13397 Marseille Cedex 20, FRANCE
c Airbus Operations SAS, 316 Route de Bayonne, 31060 Toulouse Cedex 09, FRANCE
At high temperatures under oxidizing environments, titanium-based alloys form an oxide scale and dissolve large amount of oxygen in their metallic matrix. Oxygen dissolution is a cause of embrittlement. Nitrogen is a secondary oxidant, which also dissolves in titanium during oxidation in air. Oxidation experiments of Ti-6Al-2Sn-4Zr-2Mo-0.1Si titanium-based alloy at 650 °C for 1000 h in synthetic air (20%O2- 80%N2) and in a mixture of 20%O2-80%Ar, showed that nitrogen reduces both oxide scale growth and oxygen dissolution. Atom probe tomography revealed that nitrogen effect is due to the formation of an interfacial layer of nitride Ti2N but also to the formation of a nitrogen rich a-Ti-based solid solution, which both act as difiusion barriers for oxygen because of their low oxygen solubility.
Key words: Titanium-based alloy / Oxidation / Oxygen dissolution / Nitrogen / Atom probe tomography
© The Authors, published by EDP Sciences, 2020
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