Microstructure and oxidation behaviors of near-α Ti-6.5Al-4Sn-4Zr-0. 5Mo-based alloys with Ir addition

W. L. Xiao, H. Murakami, D. H. Ping, Y. Yamabe-Mitarai

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Abstract

The microstructure and oxidation behaviors of near α-Ti-based alloys with small amount of iridium (Ir) additions were investigated. The microstructure of both Ir-free and Ir-containing alloys was observed to consist of α + β Widmanstätten colonies. The β lamellae gradually became continuous with increasing Ir additions since Ir acted as a β-stabilizer in the alloys. Isothermal oxidation test indicated that Ir addition reduced the oxidation resistance at 650 C; while at 750 C, the adherence of thermally grown oxides was enhanced, and a thin Al 2O3-enriched layer on the oxide scale was promoted in the Ir-containing alloy, which suggests that Ir addition was effective in improving oxidation resistance of near-α-based alloys at 750 C.

Original languageEnglish
Pages (from-to)3363-3369
Number of pages7
JournalJournal of Materials Science
Volume48
Issue number9
DOIs
Publication statusPublished - 2013 May 1

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ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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