Effect of Al content on the high-temperature oxidation of Co-20Cr-(5, 10)Al oxide dispersion strengthened superalloys

Hao Yu, Shigeharu Ukai, Shigenari Hayashi, Naoko Oono

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The high-temperature oxidation of Co-based oxide dispersion strengthened (ODS) Co-20Cr-(5, 10) Al-2.4Hf-1.5Y2O3 (wt%) superalloys was investigated at 900 °C and 1000 °C. The 10Al (wt%) superalloys possess better oxidation resistance with the formation of alumina scale than the 5Al (wt%) with a duplex scale of CoCr2O4/Cr2O3 and internal Al2O3. The alumina on the 10Al superalloy is composed of θ- and α-alumina at 900 °C but dominated by α-alumina at 1000 °C. The lower weight gain of 10Al superalloys at 1000 °C than at 900 °C was associated with different growth mechanisms of the Al2O3 scales.

Original languageEnglish
Pages (from-to)49-59
Number of pages11
JournalCorrosion Science
Volume118
DOIs
Publication statusPublished - 2017 Apr 1
Externally publishedYes

Keywords

  • A. Alumina
  • A. Cobalt
  • B. SEM
  • C. Oxidation

ASJC Scopus subject areas

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

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