New developed quaternary refractory superalloys

Xihong Yu, Yoko Yamabe-Mitarai, Yoshikazu Ro, Hiroshi Harada

Research output: Contribution to journalConference articlepeer-review

15 Citations (Scopus)


The novel idea for designing quaternary superalloys by two kinds of binary alloys with coherent structure was applied to Ir-Nb-Ni-Al superalloys. Eight alloys were prepared by combining two sorts of binary alloys, Ir-Nb and Ni-Al, in different proportions. The effects of the mole fraction of Ir-based alloy or the L12 alloy on the microstructure and the 0.2% flow stress of quaternary alloys were investigated. Two sorts of coherent structure, fcc/L12-Ir3Nb and fcc/L12-Ni3Al, were observed in the quaternary superalloys. The new developed quaternary Ir-based superalloys are of the advantages of Ir-based alloys and Ni-based superalloys. The 0.2% flow stress of Ir-Nb-Ni-Al at 1200°C could reach up to 350 MPa and the compressive strains were improved greatly compared with Ir-based alloys.

Original languageEnglish
Pages (from-to)619-622
Number of pages4
Issue number5-6
Publication statusPublished - 2000
Event5th IUMRS International Conference on Advanced Materials - Symposium D: Intermetallic Compounds and Bulk Metallic Glasses - Beijing, China
Duration: 1999 Jun 131999 Jun 18


  • A. Multiphase intermetallics
  • B. Mechanical properties at high temperature
  • B. Precipitates
  • C. Heat treatment

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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