Microstructure and oxidation behaviour of Ir-rich Ir-Al binary alloys

Z. B. Bao, H. Murakami, Y. Yamabe-Mitarai

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In the current study, alloys of Ir-11Al, Ir-23Al, Ir-30Al, Ir-41Al and Ir-45Al (at.%) were prepared to investigate the microstructure and oxidation behaviour of Ir-rich Ir-Al alloys. Ir(Al)ss and/or β-IrAl intermetallic phases were found to exist in the prepared alloys. During isothermal oxidation at 1100°C, the Ir(Al)ss and β-IrAl individually changed to porous and dense Al2O3. The microstructure of the oxide scale formed on Ir-23Al was similar to that of its former alloy which possessed a dendrite-like configuration. It was found that the mass change of Ir-45Al followed a parabolic law, showing the best oxidation resistance among the Ir-Al alloys.

Original languageEnglish
Pages (from-to)306-311
Number of pages6
JournalCorrosion Science
Volume87
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

Keywords

  • A. Alloy
  • B. SEM
  • B. Weight loss
  • C. High temperature corrosion
  • C. Oxidation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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