A comparative study of cyclic oxidized Ir aluminide and aluminized nickel base single crystal superalloy

P. Kuppusami, H. Murakami

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

A comparative study on microstructure, composition variation and phase distribution in an Ir-aluminide and an aluminized Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation test at 1373 K is reported. The weight change as a function of number of oxidation cycles has demonstrated an improved oxidation resistance for iridium aluminide. While aluminized TMS-75 has an enrichment of aluminium to approximately 50 at.%, an addition of iridium increases the average aluminium concentration of the surface to approximately 70 at.% in the as aluminized condition. Unlike the aluminized TMS-75, the cyclic oxidized Ir aluminide reveals a precipitate free surface layer, followed by a significantly reduced precipitation of γ′-Ni3Al and TCP phases in the diffusion zone.

Original languageEnglish
Pages (from-to)377-388
Number of pages12
JournalSurface and Coatings Technology
Volume186
Issue number3
DOIs
Publication statusPublished - 2004 Sep 1
Externally publishedYes

Keywords

  • Diffusion
  • Iridium
  • Ni-base superalloy
  • Oxidation
  • Sputtering

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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