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Nitrogen-doped TiAl alloys Part I Microstructure control

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Abstract

Effects of nitrogen addition on the microstructure control of two-phase TiAl intermetallic compounds were investigated. 1.0 at.% nitrogen addition leads to remarkable grain refinement in the fully lamellar microstructure but had little effect on the duplex microstructure. Only Ti3AlN precipitate was formed in 0.3 at.% nitrogen-doped alloy and both Ti2AlN and Ti3AlN precipitates were formed in 1.0 at.% nitrogen-doped alloy. Since the formation of the gamma phase is retarded by nitrogen addition, long-term heat treatment is needed for the duplex microstructure in the 1.0 at.% nitrogen-doped alloy. Though 0.3 at.% nitrogen-doped alloy had much lower elongation than the mother alloy, 1.0 at.% nitrogen addition had little effect on room temperature elongation and increased room temperature yield strength by two times in the fully lamellar microstructure.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, KAIST, Taejon, 305-701, South Korea

    Ju Hwan Yun

  2. Department of Materials Science and Engineering, KAIST, Taejon, 305-701, South Korea

    Dang Moon Wee

  3. Department of Materials Science and Engineering, Kumoh National University of Technology, Kumi, 730-701, South Korea

    Myung Hoon Oh

  4. Department of Materials Science and Engineering, Kyoto University, Kyoto, 606-8501, Japan

    H. Inui & M. Yamaguchi

Authors
  1. Ju Hwan Yun
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  2. Dang Moon Wee
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  3. Myung Hoon Oh
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  4. H. Inui
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  5. M. Yamaguchi
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Yun, J.H., Wee, D.M., Oh, M.H. et al. Nitrogen-doped TiAl alloys Part I Microstructure control. Journal of Materials Science 35, 4527–4532 (2000). https://doi.org/10.1023/A:1004860419517

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