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Design of quaternary Ir-Nb-Ni-Al refractory superalloys

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Abstract

We propose a method for developing new quaternary Ir-Nb-Ni-Al refractory superalloys for ultra-high-temperature uses, by mixing two types of binary alloys, Ir-20 at. pct Nb and Ni-16.8 at. pct Al, which contain fcc/L12 two-phase coherent structures. For alloys of various Ir-Nb/Ni-Al compositions, we analyzed the microstructure and measured the compressive strengths. Phase analysis indicated that three-phase equilibria—fcc, Ir3Nb-L12, and Ni3Al-L12—existed in Ir-5Nb-62.4Ni-12.6Al (at. pct) (alloy A), Ir-10Nb-41.6Ni-8.4Al (at. pct) (alloy B), and Ir-15Nb-20.8Ni-4.2Al (at. pct) (alloy C) at 1400 °C; at 1300 °C, three phase equilibria—fcc, Ir3Nb, and Ni3Al—existed in alloys A and C and four-phase equilibria—fcc, Ir3Nb, Ni3Al, and IrAl-B2—existed in alloy B. The fcc/L12 coherent structure was examined by using transmission electron microscopy (TEM). At a temperature of 1200 °C, the compressive strength of these quaternary alloys was between 130 and 350 MPa, which was higher than that of commercial Ni-based superalloys, such as MarM247 (50 MPa), and lower than that of Ir-based binary alloys (500 MPa). Compared to Ir-based alloys, the compressive strain of these quaternary alloys was greatly improved. The potential of the quaternary alloys for ultra-high-temperature use is also discussed.

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Authors and Affiliations

  1. the High Temperature Materials 21 Project, National Research Institute for Metals, 305-0047, Ibaraki, Japan

    X. H. Yu (Visiting Researcher), Y. Yamabe-Mitarai (Senior Researcher), Y. Ro (Senior Researcher) & H. Harada (Project Leader and Senior Researcher)

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  1. X. H. Yu
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  2. Y. Yamabe-Mitarai
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  3. Y. Ro
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  4. H. Harada
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Yu, X.H., Yamabe-Mitarai, Y., Ro, Y. et al. Design of quaternary Ir-Nb-Ni-Al refractory superalloys. Metall Mater Trans A 31, 173–178 (2000). https://doi.org/10.1007/s11661-000-0063-9

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  • DOI: https://doi.org/10.1007/s11661-000-0063-9

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