Investigation on microstructure and fracture of quaternary Ir-based alloys

X. H. Yu, Y. Yamabe-Mitarai, Y. Ro, H. Harada

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


The microstructure and the fracture of the new developed Ir-Nb-Ni-Al and Ir-Ta-Ni-Al were investigated. At 1300°C, three-phase equilibrium-fcc, L12-Ni3Al and Ir3Nb were observed in alloys Ir-5Nb-62.4Ni-12.6Al, Ir-15Nb-20.8Ni-4.2Al and three-phase equilibrium-fcc, L12-Ni3Al and Ir3Ta existed in alloys Ir-3.75Ta-62.4Ni-12.6Al and Ir-11.25Ta-20.8Ni-4.2Al; four-equilibrium-fcc, B2-IrAl, L12-Ni3Al and Ir3Nb or Ir3Ta were observed in alloy Ir-10Nb-41.6Ni-8.4Al or Ir-7.5Ta-41.6Ni-8.4Al. At 1400°C, the three-phase equilibrium existed in all of the alloys. The compressive strengths at 1200°C were from 79 to 616 MPa. The compressive strain of the quaternary was greatly improved compared with Ir-based alloys (below 10%). The lowest one was 18. The precipitation hardening of quaternary alloys can be caused by the precipitate-shearing mechanism. The compressive strength of quaternary alloys can be attributed to the precipitation and solid solution hardening as well as to the interface strengthening.

Original languageEnglish
Pages (from-to)677-684
Number of pages8
JournalKey Engineering Materials
Publication statusPublished - 2000 Jan 1
Externally publishedYes
EventProceedings of the 1999 8th International Conference on Creep and Fracture of Engineering Materials and Structures - Tsukuba, Jpn
Duration: 1999 Nov 11999 Nov 5

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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