Ultra-high-temperature deformation of polycrystalline and directionally solidified L12 intermetallic compound Ir3Nb

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The ultra-high-temperature deformation behaviors of polycrystalline (PC) and directionally solidified (DS) L12 intermetallic compound Ir3Nb have been investigated. The compression and compressive creep experiments were performed at temperatures from 1650 to 1800 °C at initial applied stresses from 49 to 200 MPa. The results show that the DS alloy has higher creep resistance and longer creep life than the PC alloy under above experimental conditions. The steady-state creep behavior of the DS alloy can be described in terms of power-law creep with the apparent stress exponent of 2.3 and activation energy of 295 kJ/mol. The creep mechanism is discussed in the light of the creep microstructure.

Original languageEnglish
Pages (from-to)57-62
Number of pages6
JournalIntermetallics
Volume11
Issue number1
DOIs
Publication statusPublished - 2003 Jan 1
Externally publishedYes

Keywords

  • A. Intermetallics, miscellaneous
  • B. Creep, mechanical properties at high temperatures
  • D. Grain boundaries, structure

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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