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

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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.

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Authors and Affiliations

  1. Department of Materials Engineering, and Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai, 200072, China

    Guanghui Cao, Taoping Ou & Hua Jiang

  2. Ames Laboratory, United States Department of Energy, Iowa State University, Ames, Iowa, 50011-3020, USA

    Alan M. Russell

  3. Department of Materials Science and Engineering, Iowa State University, Ames, Iowa, 50011-2300, USA

    Alan M. Russell

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  1. Guanghui Cao
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  2. Taoping Ou
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  4. Alan M. Russell
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Correspondence to Guanghui Cao.

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Cao, G., Ou, T., Jiang, H. et al. Microstructure investigations of Pt-modified γ’-Ni3Al + γ-Ni coatings on Ni-based superalloys. Journal of Materials Research 25, 1191–1195 (2010). https://doi.org/10.1557/JMR.2010.0148

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  • DOI: https://doi.org/10.1557/JMR.2010.0148

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