The nitrogen effect on the oxidation behaviour of Ti6242S titanium-based alloy: contribution of atom probe tomography

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The nitrogen effect on the oxidation behaviour of Ti6242S titanium-based alloy: contribution of atom probe tomography

Authors
  • Dupressoire, C.1
  • Descoins, M.2
  • Vande Put, A.1
  • Mangelinck, D.2
  • Emile, P.3
  • Monceau, D.1
  • 1 a
  • 2 b
  • 3 c
Type
Published Article
Journal
MATEC Web of Conferences
Publisher
EDP Sciences
Publication Date
Oct 12, 2020
Volume
321
Identifiers
DOI: 10.1051/matecconf/202032106005
Source
EDP Sciences
Keywords
License
Green
External links

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.

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