Oxidation behaviour of a novel refractory high entropy alloy at elevated temperatures

Kai Chi Lo, Hideyuki Murakami, Jien Wei Yeh, An Chou Yeh

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The refractory high entropy alloy (RHEA) has shown great potentials for high temperature applications beyond modern Ni-based superalloy. However, its oxidation behaviours are rarely reported and understood. In this work, the oxidation behaviours of a novel RHEA “NV1”, Cr-17.6Al-20.3Mo-15.2Nb-2.9Si-13.4Ta-5.4Ti (in at%), were examined at 1200, 1300, and 1400 °C up to 100 h. At 1200 °C, the oxidation kinetics curve yielded toward parabolic behaviour owing to the formation of a rutile-type complex oxide layer with Al2O3 and Cr2O3 dispersions; breakaway oxidation contributed by Cr2O3 evaporation occurred at 1300 °C; a single power-law behaviour governed the oxidation kinetics curve at 1400 °C, and mullite was identified within the oxide layer. This work provides guidelines for understanding the oxidation mechanisms and improving oxidation resistance of RHEA at elevated temperature.

Original languageEnglish
Article number106711
JournalIntermetallics
Volume119
DOIs
Publication statusPublished - 2020 Apr

Keywords

  • Corrosion
  • High–entropy alloys
  • Microstructure
  • Oxidation
  • Segregation
  • Surface properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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