Creep behavior of Ir-Nb and Ir-Zr refractory superalloys

Yamabe Mitarai Yoko, Nakazawa Shizuo, Harada Hiroshi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The microstructure stability and creep properties of Ir-base refractory super-alloys (It-Nb and Ir-Zr) with an fcc and Ll 2 two-phase structure were investigated. An orderly arrayed structure composed of cuboidal coherent Ll 2 precipitates was observed in the Ir-Nb alloys. By a different heat treatment, a maze structure and a discontinuous coarsened lamellar structure were obtained in the Ir-Zr alloys. Creep behavior was investigated for samples with these three kinds of microstructure between 1 500 and 1 800°C. The creep behavior was explained according to microstructural changes before and after creep.

Original languageEnglish
Pages (from-to)2-7
Number of pages6
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Issue number1
Publication statusPublished - 2002 Jan


  • Cuboidal precipitates
  • Lamellar structure
  • Maze structure
  • Precipitation hardening

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering


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