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Microstructure investigations of Pt-modified γ′-Ni3Al + γ-Ni coatings on Ni-based superalloys

Published online by Cambridge University Press:  31 January 2011

Guanghui Cao ,
Taoping Ou ,
Hua Jiang  and
Alan M. Russell
Hua Jiang
Affiliation:
Department of Materials Engineering, and Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, China
Alan M. Russell
Affiliation:
Ames Laboratory, United States Department of Energy, Iowa State University, Ames, Iowa 50011-3020; and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011-2300
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Abstract

The microstructure of Pt-modified γ′-Ni3Al + γ-Ni coating on CMSX-4 single-crystal superalloy has been investigated by transmission electron microscopy (TEM). Cross-sectional TEM analyses showed the presence of precipitates in the coating. This precipitate was identified as the hexagonal topologically close-packed (TCP) μ phase with lattice parameters a = 0.473 nm and c = 2.565 nm. The energy-dispersive x-ray (EDX) spectrum of the μ phase suggested a refractory element rich compound comprising the elements Re, W, and Co. Twin domains parallel to (001) were found in the μ phase. The mechanisms of the μ phase and twinning formation were discussed.

Keywords

CoatingMicrostructureTransmission electron microscopy (TEM)

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Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 6 , June 2010 , pp. 1191 - 1195
Copyright
Copyright © Materials Research Society 2010

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