Creep Behavior of Ir-Nb and Ir-Zr Refractory Superalloys

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  • YAMABE-MITARAI Yoko
    High Temperature Materials Research Group, National Institute for Materials Science (NIMS)
  • NAKAZAWA Shizuo
    High Temperature Materials Research Group, National Institute for Materials Science (NIMS)
  • HARADA Hiroshi
    High Temperature Materials Research Group, National Institute for Materials Science (NIMS)

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タイトル別名
  • Creep and Fatigue at Elevated Temperatures. Creep Behavior of Ir-Nb and Ir-Zr Refractory Superalloys.

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説明

The microstructure stability and creep properties of Ir-base refractory superalloys (It-Nb and Ir-Zr) with an fcc and L12 two-phase structure were investigated. An orderly arrayed structure composed of cuboidal coherent L12 precipitates was observed in the Ir-Nb alloys. By a different heat treatment, a maze structure and a discontinuous coarsened lamellar structure were obtained in the Ir-Zr alloys. Creep behavior was investigated for samples with these three kinds of microstructure between 1500 and 1800°C. The creep behavior was explained according to microstructural changes before and after creep.

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