Phase equilibria between the B2, L12, and fcc phases in the Ir-Ni-Al system

Y. Yamabe-Mitarai, T. Aoyagi, K. Nishida, H. Aoki, T. Abe, Hideyuki Murakami

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The isotherms of the Ir-Ni-Al in the composition range up to 50 at% Al are presented at 1573 K. The phase constitution and microstructure of the Ir-Ni-Al alloys were examined using X-ray diffractometry (XRD), scanning electron microscopy (SEM) with an electron probe microanalyzer (EPMA), and transmission electron microscopy (TEM) after heat treatment at 1573 K for 168 h. The B2-NiAl and B2-IrAl phases connected with each other at 1573 K. The highest solubility limit of Ir into Ni3Al was about 3.5 at% in the tested alloys. Then, a wide fcc + B2 and a narrow fcc + L12 and B2 + L12 two-phase region appeared in the isothermal section. In part of the B2 phase, a martensitic transformation from the B2 to the L10 phase was observed.

Original languageEnglish
Pages (from-to)479-488
Number of pages10
JournalIntermetallics
Volume15
Issue number4
DOIs
Publication statusPublished - 2007 Apr 1
Externally publishedYes

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Phase equilibria
Martensitic transformations
X ray diffraction analysis
Isotherms
Solubility
Heat treatment
Transmission electron microscopy
Microstructure
Scanning electron microscopy
Electrons
Chemical analysis

Keywords

  • A. Nickel aluminides, based on NiAl
  • A. Nickel aluminides, based on NiAl
  • B. Phase diagrams
  • D. Martensitic structure
  • D. Microstructure

ASJC Scopus subject areas

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

Cite this

Phase equilibria between the B2, L12, and fcc phases in the Ir-Ni-Al system. / Yamabe-Mitarai, Y.; Aoyagi, T.; Nishida, K.; Aoki, H.; Abe, T.; Murakami, Hideyuki.

In: Intermetallics, Vol. 15, No. 4, 01.04.2007, p. 479-488.

Research output: Contribution to journalArticle

Yamabe-Mitarai, Y. ; Aoyagi, T. ; Nishida, K. ; Aoki, H. ; Abe, T. ; Murakami, Hideyuki. / Phase equilibria between the B2, L12, and fcc phases in the Ir-Ni-Al system. In: Intermetallics. 2007 ; Vol. 15, No. 4. pp. 479-488.
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AU - Abe, T.

AU - Murakami, Hideyuki

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AB - The isotherms of the Ir-Ni-Al in the composition range up to 50 at% Al are presented at 1573 K. The phase constitution and microstructure of the Ir-Ni-Al alloys were examined using X-ray diffractometry (XRD), scanning electron microscopy (SEM) with an electron probe microanalyzer (EPMA), and transmission electron microscopy (TEM) after heat treatment at 1573 K for 168 h. The B2-NiAl and B2-IrAl phases connected with each other at 1573 K. The highest solubility limit of Ir into Ni3Al was about 3.5 at% in the tested alloys. Then, a wide fcc + B2 and a narrow fcc + L12 and B2 + L12 two-phase region appeared in the isothermal section. In part of the B2 phase, a martensitic transformation from the B2 to the L10 phase was observed.

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