Details

Autor(en) / Beteiligte

• Ju, Jiang
• Shen, Zhao
• Kang, Maodong
• Zhang, Jianqiang
• Wang, Jun

Titel

On the preferential grain boundary oxidation of a Ni-Co-based superalloy

Ist Teil von

• Corrosion science, 2022-05, Vol.199, p.110203, Article 110203

Ort / Verlag

Amsterdam: Elsevier Ltd

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The microstructure and microchemistry of the oxide scale formed on a Ni-Co-based superalloy after oxidation at 900 °C in air for 100 h were investigated by multiscale characterization techniques. Results show that a continuous surface oxide scale forms, together with internal oxides preferentially along the grain boundaries. TEM and TKD analysis reveals that the grain boundary oxides are mainly composed of equiaxed nano-sized Al2Ti7O15. A large number of plane defects are observed in Al2Ti7O15, which could work as fast-diffusion paths for the inward diffusion of oxygen, contributing to the preferential grain boundary oxidation. •A Ni-Co-based superalloy is oxidized in air at 900 ℃.•Grain boundaries are preferentially oxidized.•The grain boundary oxides are mainly Al2Ti7O15.•Many plane defects are observed in Al2Ti7O15.