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Compressive strength and creep properties of Ir-Nb-Zr alloys between 1473 and 2073 K

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Abstract

The microstructure and strength at 1473 and 2073 K and creep properties at 2073 K were investigated in three Ir-Nb-Zr alloys with the fcc and L12 two-phase structure. The microstructure and lattice misfit were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffractometry (XRD). Compression and creep tests were performed, and their deformation structures were observed using SEM and TEM. At 1473 K, the strength of the Ir-Nb-Zr alloys was higher than that of the binary Ir-Nb and Ir-Zr alloys, but they were almost equivalent at 2073 K. However, the ternary alloys showed great improvement on creep at 2073 K. The time for the 2 pct creep strain of the Ir-Nb-Zr alloy was about 100 hours, while it was 1 hour for the binary alloys. The deformation mechanisms for compressive strength and creep resistance in these Ir-Nb-Zr alloys are discussed in terms of the deformation structure.

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Authors and Affiliations

  1. the National Institute for Materials Science, 305-0047, Ibaraki, Japan

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

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  1. Y. Yamabe-Mitarai
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  2. Y. Gu
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  3. H. Harada
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Additional information

This article is based on a presentation made in the symposium entitled “Fundamentals of Structural Intermetallics,” presented at the 2002 TMS Annual Meeting, February 21–27, 2002, in Seattle, Washington, under the auspices of the ASM and TMS Joint Committee on Mechanical Behavior of Materials.

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Yamabe-Mitarai, Y., Gu, Y. & Harada, H. Compressive strength and creep properties of Ir-Nb-Zr alloys between 1473 and 2073 K. Metall Mater Trans A 34, 2207–2215 (2003). https://doi.org/10.1007/s11661-003-0284-9

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  • DOI: https://doi.org/10.1007/s11661-003-0284-9

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