Morphology evolution of Ir-X-Al (X = Nb or Zr) ternary alloys

C. Huang, Y. Yamabe-Mitarai, H. Harada

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The microstructure evolution of four samples belonging to two Ir-based ternary systems, Ir-Nb-Al and Ir-Zr-Al, has been investigated by microstructure observation using scanning electron microscopy (SEM), phase composition analysis using electron probe microscopy analysis (EPMA) methods, and phase structure determination using X-ray diffraction (XRD) patterns. An fcc/L12 two-phase structure was detected in all of the samples. One Ir-Nb-Al alloy with a composition near the Ir side of the phase diagram has been found to exhibit a microstructure similar to that of Ni-based superalloys with cuboidal L12-Ir3Nb precipitates embedded in an fcc-Ir matrix. The lattice misfit between the fcc and L12 phases of these samples has been estimated.

Original languageEnglish
Pages (from-to)1287-1290
Number of pages4
JournalMaterials Letters
Issue number8-9
Publication statusPublished - 2008 Mar 31
Externally publishedYes


  • Ir-based superalloys
  • Metals and alloys
  • Microstructure
  • fcc/L1 two-phase structure

ASJC Scopus subject areas

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


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