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| Mohamed, Tarek |
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| Ertürk, Emre |
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Put, Aurélie Vande
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Topics
Publications (8/8 displayed)
- 2021The role of nitrogen in the oxidation behaviour of a Ti6242S alloy: a nanoscale investigation by atom probe tomographycitations
- 2021Investigation of the metal dusting attack on the temperature range 500−700 °C using X-ray tomographycitations
- 2021High-Temperature Oxidation Behavior of Ti6242S Ti-based Alloycitations
- 2020A comparison of the high-temperature oxidation behaviour of conventional wrought and laser beam melted Inconel 625citations
- 2020Degradation mechanism of Ti-6Al-2Sn-4Zr-2Mo-Si alloy exposed to solid NaCl deposit at high temperaturecitations
- 2015Modelling of the kinetics of pitting corrosion by metal dustingcitations
- 2014Observation and modeling of α-NiPtAl and Kirkendall void formations during interdiffusion of a Pt coating with a γ-(Ni-13Al) alloy at high temperaturecitations
- 2011Beneficial effect of Pt and of pre-oxidation on the oxidation behaviour of an NiCoCrAlYTa bond-coating for thermal barrier coating systemscitations
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article
The role of nitrogen in the oxidation behaviour of a Ti6242S alloy: a nanoscale investigation by atom probe tomography
Abstract
When used at high temperature in air, titanium-based alloys form an oxide scale at their surface but also dissolve large amount of oxygen in their metallic matrix and this is a cause of embrittlement. Nitrogen is a secondary oxidant, which also dissolves in and embrittles the alloy. Oxidation experiments of Ti- 6Al-2Sn-4Zr-2Mo-0.1Si titanium-based alloy, for 10 0 0 h at 650 °C in synthetic air (N 2 -20%O 2 ) and in a mixture of Ar-20%O 2 , showed that nitrogen decreases both oxide scale growth and oxygen dissolution. Atom probe tomography was used to investigate the alloy/oxide interface. The results revealed that the nitrogen effect is due to the formation of interfacial layers of oxynitrides and nitride (Ti 2 N), but also to the formation of a nitrogen rich α-titanium-based solid solution, which all act as diffusion barriers for oxygen, because of their low oxygen solubility. A comparison between the experimental results and thermodynamic calculations is also reported.