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Formation of Secondary Reaction Zones in Diffusion Aluminide-Coated Ni-Base Single-Crystal Superalloys Containing Ruthenium

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Abstract

The formation of secondary reaction zones (SRZs) beneath aluminide coatings in several Ru-bearing single-crystal Ni-base superalloys has been investigated. The presence of significant amounts of Ru in the superalloys did not prevent the formation of the secondary reaction zone. However, the Ru content of the alloys affected the type of refractory element-rich phase formed during the transformation. As the Ru content increased, the phase involved in the transformation shifted from the orthorhombic P to the β-RuAl phase. A differential tendency to SRZ formation was observed between the dendritic and interdendritic regions of the alloys. Significant growth of the SRZ was also observed during the high-temperature oxidation exposure of the coated alloys. The effects of the alloying elements on SRZ formation are discussed.

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Acknowledgments

The authors thank Mr. C. Torbet for technical support and Mr. C. Henderson for assistance in SEM and EPMA analysis. The authors also acknowledge the useful discussion with Dr. L.J. Carroll. The authors are also grateful for the support of Alstom Power (Windsor, CT), for the fabrication of Ru-containing single crystals.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Hyderabad, 500058, India

    Dipak K. Das (Scientist)

  2. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA

    Shuwei Ma (Post Doctoral Research Fellow) & Tresa M. Pollock (Professor)

  3. Howmet Research Corporation, Whitehall, MI, 49461, USA

    Kenneth S. Murphy (Scientist)

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  1. Dipak K. Das
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  2. Kenneth S. Murphy
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  3. Shuwei Ma
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  4. Tresa M. Pollock
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Correspondence to Dipak K. Das.

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Manuscript submitted October 1, 2007.

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Das, D., Murphy, K., Ma, S. et al. Formation of Secondary Reaction Zones in Diffusion Aluminide-Coated Ni-Base Single-Crystal Superalloys Containing Ruthenium. Metall Mater Trans A 39, 1647–1657 (2008). https://doi.org/10.1007/s11661-008-9534-1

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