High-temperature oxidation of AlCrFeNi-(Mn or Co) high-entropy alloys: Effect of atmosphere and reactive element addition

• DOI: 10.1016/j.corsci.2021.109809
• Publication Date: 2021-08-31T05:53:10Z
• Authors: Chongchong Tang; Hao Shi; Adrian Jianu; Alfons Weisenburger; Geanta Victor; Mirco Grosse; Georg Müller; Hans Jürgen Seifert; Martin Steinbrück
• Keywords: Internal oxidation; High-Temperature Corrosion; High-Entropy Alloys; Reducing atmosphere; Partial pressure

Abstract The effects of atmosphere (oxygen and steam) and reactive element addition (Zr and Y) on high-temperature oxidation behavior of Al0.5CrFeNiMn and Al0.5CrFeNiCo high-entropy alloys at 1000 °C and 1200 °C were studied. The Al0.5CrFeNiMn alloy displayed different oxidation mechanisms in oxygen and steam owing to differing oxygen partial pressures and preferential oxidation of Mn. A protective alumina scale established on Al0.5CrFeNiCo alloy in both atmospheres and the beneficial effects of Y addition are seen by remarkably improved oxide scale adherence and suppression of convoluted oxide scale morphology. However, doping with 1 wt% Zr deteriorates the oxidation resistance with substantial Al+Zr internal oxidation.