Ordering and phase separation in b.c.c. aluminides of the Ni-Fe-Al-Ti system

R. Kainuma; K. Urushiyama; K. Ishikawa; C. C. Jia; I. Ohnuma; K. Ishida

doi:10.1016/s0921-5093(97)00587-x

Ordering and phase separation in b.c.c. aluminides of the Ni-Fe-Al-Ti system

R. Kainuma, K. Urushiyama, K. Ishikawa, C. C. Jia, I. Ohnuma, K. Ishida

ENG - Metallurgy

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

40 Citations (Scopus)

Abstract

The phase equilibria and ordering reactions in the b.c.c. aluminides of the Ni-Al-Ti-Fe system at 800-1300°C have been investigated mainly by the diffusion couple method. The compositions of the β (B2: (Ni,Fe)(Al,Ti)) and H (L2₁: (Ni5Fe)₂AlTi) phases in equilibrium, the critical boundaries of the continuous ordering transition and the tricritical points have been determined. It is shown that the miscibility gap boundary between the β and H phases, tie line configurations and the β-H second order reaction can all be depicted inside a composition square whose corners are made up of NiAl-NiTi-FeAl-FeTi, respectively, i.e. (Ni,Fe)-50 at.% (Al,Ti). The stability region of the Heusler phase and the β + H immiscibility gap in the NiAl-NiTi pseudo-binary system are narrowed down by increasing the Fe content. The phase stability of these ordered b.c.c. aluminides is presented and discussed.

Original language	English
Pages (from-to)	235-244
Number of pages	10
Journal	Materials Science and Engineering A
Volume	239-240
Issue number	1-2
DOIs	https://doi.org/10.1016/s0921-5093(97)00587-x
Publication status	Published - 1997 Dec

Keywords

B2 phase
FeAlTi alloy
L2 phase
Miscibility gap
NiAl
Order-disorder transition
Phase stability
Ti alloy
Tricritical point
b.c.c. aluminides

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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@article{5a29d8044a8d4fa38f0704ba80bbf22f,

title = "Ordering and phase separation in b.c.c. aluminides of the Ni-Fe-Al-Ti system",

abstract = "The phase equilibria and ordering reactions in the b.c.c. aluminides of the Ni-Al-Ti-Fe system at 800-1300°C have been investigated mainly by the diffusion couple method. The compositions of the β (B2: (Ni,Fe)(Al,Ti)) and H (L21: (Ni5Fe)2AlTi) phases in equilibrium, the critical boundaries of the continuous ordering transition and the tricritical points have been determined. It is shown that the miscibility gap boundary between the β and H phases, tie line configurations and the β-H second order reaction can all be depicted inside a composition square whose corners are made up of NiAl-NiTi-FeAl-FeTi, respectively, i.e. (Ni,Fe)-50 at.% (Al,Ti). The stability region of the Heusler phase and the β + H immiscibility gap in the NiAl-NiTi pseudo-binary system are narrowed down by increasing the Fe content. The phase stability of these ordered b.c.c. aluminides is presented and discussed.",

keywords = "B2 phase, FeAlTi alloy, L2 phase, Miscibility gap, NiAl, Order-disorder transition, Phase stability, Ti alloy, Tricritical point, b.c.c. aluminides",

author = "R. Kainuma and K. Urushiyama and K. Ishikawa and Jia, {C. C.} and I. Ohnuma and K. Ishida",

note = "Funding Information: The authors wish to thank Professor Dr G. Inden, MPI, D{\"u}sseldorf, for fruitful discussions. They thank Dr L. Chandrasekaran, DRA, UK, for helping in the presentation of the manuscript. This work was supported by grants-in-aids for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan. The authors acknowledge the support from the Japan Society for Promotion of Science (JSPS) and the TEPCO Research Foundation. ",

year = "1997",

month = dec,

doi = "10.1016/s0921-5093(97)00587-x",

language = "English",

volume = "239-240",

pages = "235--244",

journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",

issn = "0921-5093",

publisher = "Elsevier BV",

number = "1-2",

}

TY - JOUR

T1 - Ordering and phase separation in b.c.c. aluminides of the Ni-Fe-Al-Ti system

AU - Kainuma, R.

AU - Urushiyama, K.

AU - Ishikawa, K.

AU - Jia, C. C.

AU - Ohnuma, I.

AU - Ishida, K.

N1 - Funding Information: The authors wish to thank Professor Dr G. Inden, MPI, Düsseldorf, for fruitful discussions. They thank Dr L. Chandrasekaran, DRA, UK, for helping in the presentation of the manuscript. This work was supported by grants-in-aids for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan. The authors acknowledge the support from the Japan Society for Promotion of Science (JSPS) and the TEPCO Research Foundation.

PY - 1997/12

Y1 - 1997/12

N2 - The phase equilibria and ordering reactions in the b.c.c. aluminides of the Ni-Al-Ti-Fe system at 800-1300°C have been investigated mainly by the diffusion couple method. The compositions of the β (B2: (Ni,Fe)(Al,Ti)) and H (L21: (Ni5Fe)2AlTi) phases in equilibrium, the critical boundaries of the continuous ordering transition and the tricritical points have been determined. It is shown that the miscibility gap boundary between the β and H phases, tie line configurations and the β-H second order reaction can all be depicted inside a composition square whose corners are made up of NiAl-NiTi-FeAl-FeTi, respectively, i.e. (Ni,Fe)-50 at.% (Al,Ti). The stability region of the Heusler phase and the β + H immiscibility gap in the NiAl-NiTi pseudo-binary system are narrowed down by increasing the Fe content. The phase stability of these ordered b.c.c. aluminides is presented and discussed.

AB - The phase equilibria and ordering reactions in the b.c.c. aluminides of the Ni-Al-Ti-Fe system at 800-1300°C have been investigated mainly by the diffusion couple method. The compositions of the β (B2: (Ni,Fe)(Al,Ti)) and H (L21: (Ni5Fe)2AlTi) phases in equilibrium, the critical boundaries of the continuous ordering transition and the tricritical points have been determined. It is shown that the miscibility gap boundary between the β and H phases, tie line configurations and the β-H second order reaction can all be depicted inside a composition square whose corners are made up of NiAl-NiTi-FeAl-FeTi, respectively, i.e. (Ni,Fe)-50 at.% (Al,Ti). The stability region of the Heusler phase and the β + H immiscibility gap in the NiAl-NiTi pseudo-binary system are narrowed down by increasing the Fe content. The phase stability of these ordered b.c.c. aluminides is presented and discussed.

KW - B2 phase

KW - FeAlTi alloy

KW - L2 phase

KW - Miscibility gap

KW - NiAl

KW - Order-disorder transition

KW - Phase stability

KW - Ti alloy

KW - Tricritical point

KW - b.c.c. aluminides

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U2 - 10.1016/s0921-5093(97)00587-x

DO - 10.1016/s0921-5093(97)00587-x

M3 - Article

AN - SCOPUS:0001466421

VL - 239-240

SP - 235

EP - 244

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

IS - 1-2

ER -