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Thermodynamic Analysis of the Effects of Alloying Elements on the Stacking Fault Energy in Ruthenium-Bearing Nickel Alloys

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Abstract:

The effects of Al, Co, Re, and Ru on the stacking fault energy in Ni alloys were analyzed using computational thermodynamics. The effects of adding up to 5 at% Re or Ru to a Ni-15at%Co system were found to be weak at 300 °C, 700 °C, and 900 °C. However, Al addition decreased the stacking fault energy in a Ni-15at%Co-Xat%Ru system, where X = 0, 3, 5. In addition, this decrease in the stacking fault energy due to Al addition became more significant as the amount of Ru increased. Furthermore, in Ni–Co–Al–Ru alloys containing 9at%Al, the addition of 5at%Ru decreased the stacking fault energy as much as the addition of 12.5at%Co at 900 °C. The effects of Co and Ru addition on the γ/γ’ microstructure of Ni-based superalloys were also discussed.

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Info:

Periodical:

Advanced Materials Research (Volume 1119)

Pages:

580-584

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1119.580

Citation:

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Online since:

July 2015

Authors:

Tomonori Kitashima*

Keywords:

Nickel Alloy, Ruthenium, Stacking Fault, Thermodynamics, Turbine Blade

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* - Corresponding Author

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