1. The nitrogen effect on the oxidation behaviour of Ti6242S titanium-based alloy: contribution of atom probe tomography
- Author
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Dominique Mangelinck, Marion Descoins, Philippe Emile, Charlotte Dupressoire, Daniel Monceau, A. Vande Put, Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Airbus Operation S.A.S., Airbus [France], ANR-13-RMNP-0014,DUSTI,DUrabilité des Structures aéronautiques en alliage de TItane(2013), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), and Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,Nitrogen ,Inorganic chemistry ,technology, industry, and agriculture ,0211 other engineering and technologies ,Titanium based alloy ,Titanium-based alloy ,[CHIM.MATE]Chemical Sciences/Material chemistry ,02 engineering and technology ,Atom probe ,Oxygen dissolution ,Engineering (General). Civil engineering (General) ,equipment and supplies ,Nitrogen effect ,law.invention ,Atom probe tomography ,020303 mechanical engineering & transports ,0203 mechanical engineering ,law ,Oxidation ,021105 building & construction ,TA1-2040 - Abstract
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.
- Published
- 2020
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