Phase equilibria and oxidation behavior of Ir-rich Ir-Y binary alloys

Nobuaki Sekido, Hideyuki Murakami, Yoko Yamabe-Mitarai

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11 Citations (Scopus)


The phase equilibria and oxidation behavior of Ir-Y binary alloys have been investigated. A phase diagram at the Ir-rich end in the Ir-Y binary system has been proposed on the basis of experimental results. Iridium is found to dissolve little Y in the FCC solid solution. The pure-Ir and Ir-Y binary alloys exhibit severe weight loss upon air-exposure at 1373 K with elapsed time. Protective oxide layers are not formed on the surface of the alloys with Y up to, at least, 20 at.%. The kinetics of the oxidation is controlled by the formation and sublimation of Ir oxides at the surface.

Original languageEnglish
Pages (from-to)107-112
Number of pages6
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 2009 May 12


  • High temperature alloys
  • Oxidation
  • Phase diagrams
  • Rare earth alloys and compounds


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