Creep behaviors of an Ir-23Nb alloy at ultra-high temperatures

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The ultra-high-temperature creep behaviors of an Ir-base, Ir-23Nb (in at. pct), two-phase refractory superalloy have been investigated. The compression creep experiments were performed at tempera- tures from 1650°C to 1800°C at initial applied stresses from 49 to 200 MPa. The results show that Ir-23Nb alloy has higher creep resistance and longer creep life in comparison to Ir-17Nb alloy under the same experimental conditions. The steady-state creep behavior can be described in terms of power-law creep with the apparent stress exponent of 4.5 and apparent activation energy of 653 kJ/mol. Basing on the investigation, the possible reasons for the great improvement on the creep resistance and creep life in Ir-23Nb alloy are discussed.

Original languageEnglish
Pages (from-to)2217-2221
Number of pages5
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume34 A
Issue number10
Publication statusPublished - 2003 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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