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

Nobuaki Sekido, Hideyuki Murakami, Yoko Yamabe-Mitarai

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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
Volume476
Issue number1-2
DOIs
Publication statusPublished - 2009 May 12
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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