Effects of carbon addition on the microstructure and mechanical properties of Ir85Nb15 two-phase refractory superalloy

Y. F. Gu, Y. Yamabe-Mitarai, H. Harada

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1 Citation (Scopus)


To provide information relevant to Ir-base two-phase alloys for future ultra-high-temperature applications, effects of carbon addition on the structure development and mechanical properties of a two-phase Ir85Nb15 alloy were investigated. The results show that carbide formation is not necessary for stabilising the grains in the two-phase Ir85Nb15 alloy at temperatures up to 1800 °C. At temperatures up to 1200 °C, the yield strength of the carbon-doped Ir85Nb15 alloys was higher than that of the carbon-free alloy. The carbon addition to the Ir85Nb15 alloy changed the fracture mode from intergranular to transgranular cleavage.

Original languageEnglish
Pages (from-to)216-219
Number of pages4
JournalMaterials Science and Engineering A
Issue number1-2
Publication statusPublished - 2003 Jan 2
Externally publishedYes


  • Carbon addition
  • IrNb
  • Refractory superalloy

ASJC Scopus subject areas

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


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