Air-oxidation of FeCoNiCr-based quinary high-entropy alloys at 700–900 °C. (June 2017)

• Record Type: Journal Article
• Authors: Kai, Wu; Li, C.C.; Cheng, F.P.; Chu, K.P.; Huang, R.T.; Tsay, L.W.; Kai, J.J.
• Is Part Of: Corrosion science. Volume 121(2017)
• Page Start: 116
• Page End: 125
• Publication Date: 2017-06
• Subjects: A: High-entropy alloys -- B: Oxidation -- C: Scales; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2017.02.008
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The oxidation of three high-entropy alloys was studied in dry air at 700–900 °C. The oxidation kinetics of all the alloys followed the parabolic rate law. Multiple scales formed on the alloys were strongly composition-dependent. Abstract: The oxidation of three quinary equimolar high-entropy alloys, containing FeCoNiCrAl, FeCoNiCrMn, and FeCoNiCrSi was studied in dry air at 700–900 °C. The Mn-containing alloy was single-phase, while both Al- and Si-containing alloys were dual-phase. The oxidation kinetics of all the alloys followed the parabolic rate law, regardless of temperature and alloy composition. The oxidation rates of both Al- and Si-containing alloys were lower than those of the quaternary FeCoNiCr alloy, while those of the Mn-containing alloy went to an opposite direction. Multiple scales formed on the alloys were strongly composition-dependent.