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Compressive creep properties of Ir-base refractory superalloys

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Abstract

Ir-base alloys with the fcc and L12-Ir3X (X = Nb, Zr) two-phase structure have been developed as next-generation high-temperature materials. The compressive creep behavior of Ir-Nb and Ir-Zr alloys was investigated at 2073 K under 137 MPa. The effect of addition of the third element, Zr, on the creep behavior of an Ir-Nb alloy was also investigated at 2073 K for 137 MPa. The creep rate became two orders lower by addition of a small amount of Zr. The lattice misfit change between the fcc and L12 two phase by addition of Zr and the deformation structure in binary and ternary alloys after a creep test were also investigated. The creep behavior is discussed in terms of the lattice misfit, precipitate shape, and their distribution.

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Authors and Affiliations

  1. the High Temperature Materials Group, National Institute for Materials Science, Tsukuba, 305-0047, Ibaraki, Japan

    Y. Yamabe-Mitarai (Senior Researcher), Y. Gu (Senior Researcher), H. Harada (Project Director) & C. Huang (Postdoctoral Researcher)

Authors
  1. Y. Yamabe-Mitarai
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  2. Y. Gu
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  3. H. Harada
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  4. C. Huang
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Additional information

This article is based on a presentation made in the symposium entitled “Beyond Nickel-Base Superalloys,” which took place March 14–18, 2004, at the TMS Spring meeting in Charlotte, NC, under the auspices of the SMD-Corrosion and Environmental Effects Committee, the SMD-High Temperature Alloys Committee, the SMD-Mechanical Behavior of Materials Committee, and the SMD-Refractory Metals Committee.

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Yamabe-Mitarai, Y., Gu, Y., Harada, H. et al. Compressive creep properties of Ir-base refractory superalloys. Metall Mater Trans A 36, 547–557 (2005). https://doi.org/10.1007/s11661-005-0169-1

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  • DOI: https://doi.org/10.1007/s11661-005-0169-1

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