The oxidation behavior of Tix(AlCrNb)100−x light-weight medium-entropy alloys in dry air at 600–800 °C. (February 2023)

• Record Type: Journal Article
• Authors: Kai, W.; Liao, C.C.; Yang, I.R.; Chu, C.I.; Liu, S.F.; Kai, J.J.
• Is Part Of: Corrosion science. Volume 211(2023)
• Publication Date: 2023-02
• Subjects: A. medium-entropy alloy -- B. SEM -- B. TEM -- C. Scales; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110890
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Air-oxidation behavior of three Tix (AlCrNb)100−x light-weight medium-entropy alloys, where x = 70, 65, and 40, was investigated at 600–800 °C. The oxidation kinetics of all alloys obeyed the parabolic-rate law, having the oxidation rates steadily increasing with temperature and Ti content. Intermixed scales of TiO2 and Al2 O3 formed on all alloys, and an exclusive TiO2 layer formed in the inner layer and an internal nitrogen attack to form TiN was noted at 800 °C. The oxidation mechanism was due mainly to inward oxygen diffusion. Highlights: All the Tix(AlCrNb)100−x alloys oxidized parabolically at 600–800 °C. The oxidation rate constants increased with increasing temperature and Ti content. Intermixed scales of TiO2 and Al2 O3 formed on all alloys. The oxidation mechanism of all alloys was due to inward oxygen diffusion.