High-temperature mechanical properties of B2 type IrAl intermetallic compounds doped with Ni

T. Ono, A. Chiba, X. G. Li, S. Takahashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Compression tests have been conducted to examine the mechanical behavior of polycrystalline Ir1-xNixAl intermetallic compounds with x=0 to 0.8 at elevated temperatures. The crystal structure of the Ir1-xNixAl compounds has been determined to be a B2 type ordered structure by X-ray analyses. Although IrAl fractures without exhibiting appreciable yielding at temperatures up to 873 K, a steady state-like deformation in IrAl takes place at temperatures higher than approximately 1273 K. Ductility of Ir1-xNixAl is improved with increasing x. On the contrary, the strength decreases with increasing x in the intermediate temperature range. The IrAl alloy exhibits the 0.2% flow stress of 1200 MPa at 1073 K and 350 MPa at 1473 K, having the negative temperature dependence of the strength. Further more, the specific strength of Ir1-xNixAl is almost independent of x at temperatures higher than approximately 1473 K. The 0.2% flow stress and the specific 0.2% flow stress of Ir0.2Ni0.8Al is significantly higher than that of binary NiAl over the entire temperature range to 1673 K.

Original languageEnglish
Pages (from-to)171-174
Number of pages4
JournalMaterials Transactions, JIM
Volume38
Issue number2
DOIs
Publication statusPublished - 1997 Feb
Externally publishedYes

Keywords

  • High-temperature
  • Intermetallic compounds
  • Iridium aluminum
  • Mechanical properties
  • Strength

ASJC Scopus subject areas

  • Engineering(all)

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