Abstract
The oxidation behavior of the Ti38V15Nb23Hf24 refractory high-entropy alloy (RHEA) in air was systematically studied in this work. Two distinct types of oxidation behavior were observed. Below 1000 ℃, a dense composite oxide scale with highly consistent lattice constant and crystallographic orientation was formed on the surface, while above 1000 ℃, internal oxidation with the formation of needle-like HfO2 occurred in the alloy matrix below the alloy-scale interface. The internal oxidation is caused by the sufficient inward-diffusing oxygen after the decomposition of dense outer oxide layer with sluggish oxygen diffusivity. This research provides new understanding for the development of new antioxidation RHEAs.
Original language | English |
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Article number | 110153 |
Journal | Corrosion Science |
Volume | 198 |
DOIs | |
Publication status | Published - 15 Apr 2022 |
Keywords
- High-temperature corrosion
- Internal oxidation
- Refractory high-entropy alloy
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- General Materials Science