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Nitrogen-doped TiAl alloys Part II Plastic deformation behavior

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Abstract

Effects of the nitrogen addition on high temperature tensile properties and creep resistance of the fully lamellar and the duplex Ti-48.5Al-1.5Mo (at.%) alloy were investigated. High temperature yield strength of the nitrogen-doped alloys increased due to solute hardening and precipitation hardening of Ti3AlN. Nitrogen addition led to remarkable improvement of creep resistance in the duplex microstructure as well as in the fully lamellar microstructure. In particular, the primary creep deformation of the 1.0 at.% nitrogen-doped alloy with the duplex microstructure decreased definitely to a similar or superior level of the fully lamellar alloy. We consider that precipitate hardening of p-phase (Ti3AlN) and solute hardening of nitrogen atoms may be responsible for such remarkable creep resistance of the nitrogen-doped alloys.

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Authors and Affiliations

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

    Ju Hwan Yun, Han Seo Cho & Soo Woo Nam

  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

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  1. Ju Hwan Yun
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  2. Han Seo Cho
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  3. Soo Woo Nam
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  4. Dang Moon Wee
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  5. Myung Hoon Oh
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Yun, J.H., Cho, H.S., Nam, S.W. et al. Nitrogen-doped TiAl alloys Part II Plastic deformation behavior. Journal of Materials Science 35, 4533–4537 (2000). https://doi.org/10.1023/A:1004864520426

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