Microstructure and High Temperature Compressive Strength of Nb-Ir Alloys

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  • Tan Yi
    Japan Ultra-high Temperature Materials Research Institute (JUTEMI)
  • Tanaka Hisao
    Japan Ultra-high Temperature Materials Research Institute (JUTEMI)
  • Ma Chaoli
    Japan Ultra-high Temperature Materials Research Institute (JUTEMI)
  • Kasama Akio
    Japan Ultra-high Temperature Materials Research Institute (JUTEMI)
  • Tanaka Ryohei
    Japan Ultra-high Temperature Materials Research Institute (JUTEMI)
  • Mishima Yoshinao
    Department of Materials Science and Engineering, Tokyo Institute of Technology
  • Hanada Shuji
    Institute for Materials Research, Tohoku University

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Other Title
  • Nb-Ir系合金のミクロ組織と高温圧縮強度
  • Nb-Irケイ ゴウキン ノ ミクロ ソシキ ト コウオン アッシュク キョウド

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Abstract

Mechanical behavior of binary Nb-Ir alloys was investigated by compression tests at the temperatures ranging from room temperature to 1773 K. It was found that 0.2% flow stress increases with increasing Ir content within the single phase region of Nb solid solution, up to 6 mol%Ir and exhibits a distinct solid solution hardening. The 0.2% flow stress of the two-phase alloys consisting of Nb solid solution and an intermetallic compound Nb3Ir, in the alloys with 6 to 22 mol%Ir, also increases with increasing Ir content presumably by the precipitation hardening of the intermetallic phase. The strength of the single phase compounds seemed to be very high and the measurement of 0.2% flow stress by compression tests was unsuccessful due to premature failure below 1473 K. The Vickers hardness of the compound was about 11000 to 12000 MPa at room temperature.

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