STEM-EELS identification of TiOXNY, TiN, Ti2N and O, N dissolution in the Ti2642S alloy oxidized in synthetic air at 650 °C

Iman Abdallah (1) , Charlotte Dupressoire (1) , Lydia Laffont (1) , Daniel Monceau (1) , Aurélie Vande Put (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Oxide-alloy interface of Ti6242S Ti-based alloy was investigated by STEM-EELS technique, after oxidation in both N2-free and synthetic air atmospheres at 650 °C for 1000 h. The chemical shift of Ti-L2,3 edge and its specific fine structure along the oxide-alloy interface were used as fingerprint to distinguish the different compositions of titanium nitrides and oxynitrides. TiN, Ti2N and TiNxOy were identified in the sample oxidized in synthetic air at the oxide-alloy interface. Moreover, a decreasing in the oxidation state of Ti oxides was found along with Sn segregation at the oxide-alloy interface for the sample oxidized in N2-free atmosphere.

Mots clés: Titanium; Alloys; STEM; Interfaces; Oxidation

Domaines: Matériaux

Iman Abdallah, Charlotte Dupressoire, Lydia Laffont, Daniel Monceau, Aurélie Vande Put. STEM-EELS identification of TiOXNY, TiN, Ti2N and O, N dissolution in the Ti2642S alloy oxidized in synthetic air at 650 °C. Corrosion Science, 2019, 153, pp.191-199. ⟨10.1016/j.corsci.2019.03.037⟩. ⟨hal-02115253⟩