Microstructure and mechanical properties of Ir-Ta coatings on nickel-base single-crystal superalloy TMS-75

P. Kuppusami, H. Murakami, T. Ohmura

Research output: Contribution to journalArticle

12 Citations (Scopus)


The iridium-alloy coatings with varying contents of tantalum, prepared by dc magnetron sputtering from a composite target, were investigated. It was observed that pure coatings of iridium and tantalum form polycrystalline films with rms roughness of ∼5 nm. The Ir-Ta coatings formed a nanocrystalline structure whose crystallite size and rms roughness decrease with increase in tantalum content. It was shown that the Young's modulus and hardness of the coatings generally decrease with increase in the tantalum content.

Original languageEnglish
Pages (from-to)1208-1217
Number of pages10
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Issue number4
Publication statusPublished - 2004 Jul 1


ASJC Scopus subject areas

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

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