Effect of testing atmosphere on cyclic tensile deformation of TiAl-based intermetallic alloys

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  • Kaneno Yasuyuki
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Kondo Toshikazu
    Graduated Student, Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Takasugi Takayuki
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University

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Other Title
  • ＴｉＡｌ基合金の繰返し引張変形特性に及ぼす試験雰囲気の影響
  • TiAlキ ゴウキン ノ クリカエシ ヒッパリ ヘンケイ トクセイ ニ オヨボス シケン フンイキ ノ エイキョウ

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Abstract

TiAl-based intermetallic alloys with a lamellar microstructure and β containing duplex microstructure were cyclically tensile deformed in various environmental media as a function of temperature. Environmental media used in this study were vacuum, air and a mixture gas of H2 gas+Ar gas. The environmental embrittlement, i.e., reduction of number of cycles to failure was observed when deformed in air as well as in Ar gas including H2 gas. The severe environmental embrittlement was observed not only at room temperature but also at ~873 K. Fracture patterns and the associated fracture mode were not affected by the environmental media. The possible species causing the environmental embrittlement is suggested to be hydrogen atoms decomposed from water vapor (H2O) or hydrogen gas (H2). The feature observed in the present study was similar in both TiAl-based intermetallic alloys and, also to the previous observation, i.e., the feature of the environmental embrittlement observed in simply tensile deformed specimens.

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