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

P. Kuppusami, Hideyuki 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

Fingerprint

Iridium
heat resistant alloys
iridium
Nickel
Aluminum
Superalloys
Single crystals
nickel
aluminum
Oxidation
oxidation
oxidation resistance
single crystals
Oxidation resistance
Precipitates
precipitates
surface layers
microstructure
Microstructure
cycles

Keywords

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

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

A comparative study of cyclic oxidized Ir aluminide and aluminized nickel base single crystal superalloy. / Kuppusami, P.; Murakami, Hideyuki.

In: Surface and Coatings Technology, Vol. 186, No. 3, 01.09.2004, p. 377-388.

Research output: Contribution to journalArticle

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