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Thermal stability of phases in a NiCoCrAlY coating alloy

Published online by Cambridge University Press:  31 January 2011

J.J. Liang ,
H. Wei ,
G.C. Hou ,
Q. Zheng ,
X.F. Sun ,
H.R. Guan  and
Z.Q. Hu
J.J. Liang
Affiliation:
Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and Graduate School of Chinese Academy of Sciences, Beijing 100039, People’s Republic of China
H. Wei*
Affiliation:
Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
G.C. Hou
Affiliation:
Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Q. Zheng
Affiliation:
Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
X.F. Sun
Affiliation:
Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
H.R. Guan
Affiliation:
Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Z.Q. Hu
Affiliation:
Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The temperature dependence of the thermal stability in a NiCoCrAlY coating alloy was examined by experimental observation and thermodynamic modeling in the 400–1200 °C temperature range. The results indicated that the thermal stabilities of primary β–NiAl, β–NiAl/α–Cr eutectic, and γ–Ni were slightly temperature dependent, but those of γ′–Ni3Al, σ–(Cr,Co,Ni), and α–Cr were strongly temperature dependent in the annealed NiCoCrAlY specimens. The temperature dependence of the thermal stabilities among γ′–Ni3Al, σ–(Cr,Co,Ni), and α–Cr might be ascribed to the σ → α transformation at ∼1100 °C and the γ′ → γ transformation at ∼800 °C. Further, using Thermocalc associated with TTNi7 database, thermodynamic equilibria were calculated. The modeling results were compared with the experimental results and found to be in reasonable agreement with the experimental observations of β–NiAl, σ–(Cr,Co,Ni), and γ′–Ni3Al. Some deviations observed are discussed in the light of both limited availability of thermodynamic data and experimental problems.

Keywords

CoatingPhase transformationTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2264 - 2274
Copyright
Copyright © Materials Research Society 2008

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