Morphology evolution of Ir-Nb-X (X = Hf, Ta, or Ti) ternary alloys

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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The microstructure evolution of nine samples from three Ir-base ternary systems, Ir-Nb-Hf, Ir-Nb-Ta, and Ir-Nb-Ti, was investigated by microstructure observation using scanning electron microscopy (SEM), composition map-analysis using electron probe microscopy analysis (EPMA), and phase determination using X-ray diffraction (XRD) patterns. The fcc/L12 two-phase structure was detected in all the samples. Lattice misfits between fcc and L12 phases were calculated. Ir-Nb-Ta and Ir-Nb-Ti alloys exhibited a microstructure quite similar to that of Ni-base superalloys, and the cuboidal L12 precipitates in Ir-Nb-Ta and Ir-Nb-Ti alloys could maintain up to 1900 °C.

Original languageEnglish
Pages (from-to)220-229
Number of pages10
JournalJournal of Alloys and Compounds
Volume428
Issue number1-2
DOIs
Publication statusPublished - 2007 Jan 31
Externally publishedYes

Keywords

  • High-temperature alloys
  • Intermetallics
  • Microstructure

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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