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Partial phase relationships in Ir-Nb-Ni-Al and Ir-Nb-Pt-Al quaternary systems and mechanical properties of their alloys

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Abstract

Two quanternary systems, Ir-Nb-Ni-Al and Ir-Nb-Pt-Al, were successively investigated to assess their possible use in ultra-high-temperature applications. The phase relationships concentrated on the fcc/L12 two-phase region were primarily established, and the mechanical properties were studied. Ir-Nb-Ni-Al quaternary alloys around the Ir-rich or Ni-rich corners of the Ir-Nb-Ni-Al tetrahedron showed a coherent fcc/L12 two-phase structure, analogous to that of Ni-base superalloys; however, most of the alloys presented three or four phases with two types of L12 phases. Although these alloys showed a high compressive strength at high temperature, they exhibited a higher creep rate than Ir-base binary and ternary alloys. Another quanternary system, Ir-Nb-Pt-Al, showed promising results. Only an fcc/L12 two-phase structure was found in all the alloys investigated with compositions ranging from the Ir-rich side to the Pt-rich side, and the lattice misfit between the fcc and L12 phases was small. The high-temperature strength at 1200 °C of Ir-Nb-Pt-Al alloys was higher than that of Ir-Nb-Ni-Al alloys with the same Ir content (at. pct). Moreover, Ir-Nb-Pt-Al alloys exhibited excellent creep resistance at 1400 °C and 100 MPa.

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Author notes

  1. X. H. Yu (Project Researcher)

    Present address: the National Institute for Materials Science (NIMS), 305-0047, Ibarakl, Japan

Authors and Affiliations

  1. the National Institute for Materials Science (NIMS), 305-0047, Ibarakl, Japan

    C. Huang (Postdoctor Researcher), Y. Yamabe-Mitarai (Senior Researcher), S. Nakazawa (Senior Researcher) & H. Harada (Project Director)

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  1. C. Huang
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  2. Y. Yamabe-Mitarai
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  3. S. Nakazawa
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  4. H. Harada
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  5. X. H. Yu
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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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Huang, C., Yamabe-Mitarai, Y., Nakazawa, S. et al. Partial phase relationships in Ir-Nb-Ni-Al and Ir-Nb-Pt-Al quaternary systems and mechanical properties of their alloys. Metall Mater Trans A 36, 539–545 (2005). https://doi.org/10.1007/s11661-005-0168-2

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  • DOI: https://doi.org/10.1007/s11661-005-0168-2

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