Atom probe microanalysis of Ir-bearing Ni-based superalloys

H. Murakami*, Y. Koizumi, T. Yokokawa, Y. Yamabe-Mitarai, T. Yamagata, H. Harada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


The effects of Ir addition on the microstructural characteristics of Ni-based single crystal superalloys have been investigated using atom probe field ion microscopy (APFIM) and the results were compared with numerical estimations obtained from the Monte Carlo simulations (MCS) and the cluster variation method (CVM). The alloy investigated was TMS-79 (Ni-12.6 at% Al-7.7 at% Cr-4.6 at% Mo-2.7 at% Ta-1.8 at% Ir). APFIM analysis revealed that Ir atoms have a slight preference to partition into the γ-phase and to substitute for the Al site in the γ′ precipitates, which showed agreement with numerical estimations by CVM and MCS. The possible effect of Ir additions on the mechanical properties is briefly discussed.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalMaterials Science and Engineering: A
Issue number1
Publication statusPublished - 1998 Jul 15
Externally publishedYes


  • Cluster variation method
  • Microanalysis
  • Ni-based superalloys

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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