Oxidation behavior of the Ti38V15Nb23Hf24 refractory high-entropy alloy at elevated temperatures

Di Ouyang, Zheng jie Chen, Hai bin Yu, K. C. Chan, Lin Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

32 Citations (Scopus)

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 languageEnglish
Article number110153
JournalCorrosion Science
Volume198
DOIs
Publication statusPublished - 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

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