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; H. Murakami

doi:10.1016/j.intermet.2006.08.015

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, H. Murakami

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	479-488
Number of pages	10
Journal	Intermetallics
Volume	15
Issue number	4
DOIs	https://doi.org/10.1016/j.intermet.2006.08.015
Publication status	Published - 2007 Apr 1
Externally published	Yes

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

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

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.",

keywords = "A. Nickel aluminides, based on NiAl, A. Nickel aluminides, based on NiAl, B. Phase diagrams, D. Martensitic structure, D. Microstructure",

author = "Y. Yamabe-Mitarai and T. Aoyagi and K. Nishida and H. Aoki and T. Abe and H. Murakami",

year = "2007",

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doi = "10.1016/j.intermet.2006.08.015",

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T1 - Phase equilibria between the B2, L12, and fcc phases in the Ir-Ni-Al system

AU - Yamabe-Mitarai, Y.

AU - Aoyagi, T.

AU - Nishida, K.

AU - Aoki, H.

AU - Abe, T.

AU - Murakami, H.

PY - 2007/4/1

Y1 - 2007/4/1

N2 - 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.

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.

KW - A. Nickel aluminides, based on NiAl

KW - B. Phase diagrams

KW - D. Martensitic structure

KW - D. Microstructure

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