Drastically improved ductility of an Ir-base alloy by mixing Ir-Nb with Ni-Al

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The fcc/Ll2 coherent structure formed in the quaternary Ir-Nb-Ni-Al alloys. The ductility of quaternary Ir-Nb alloy was drastically improved by mixing with Ni-Al binary alloy. The two investigated alloys exhibited higher high-temperature 0.2% flow stress (e.g. above 1000 MPa at 1200 °C) and better ductility (≈ 20% both at room temperature and 1200 °C). An excellent balance of high-temperature strength and ductility was obtained. The improvement of ductility was attributed to change the fracture mode from intergranular to transgranular.

Original languageEnglish
Pages (from-to)481-485
Number of pages5
JournalMaterials Science and Engineering A
Publication statusPublished - 2002 Jun
Externally publishedYes


  • Ductility
  • High-temperature strength
  • Microstructure
  • Quaternary Ir-base alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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