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Influence of Co content on stacking fault energy in Ni–Co base disk superalloys

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Abstract

The influence of Co content on stacking fault energy (SFE) of the γ matrix in four Ni–Co base superalloys, including newly developed alloys, has been studied by utilizing high-resolution transmission electron microscopy. The results indicated the SFE was not linear with Co content of the γ matrix. The lowest SFE could be attained at around 34.0 at.% Co. This effect was attributed to variation of electron holes, saturated Co content in the matrix, and the effect of Co on the partition coefficient of other alloying elements. A high density of twins was related to low SFE and could improve the mechanical properties.

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ACKNOWLEDGMENTS

The authors thank Prof. L.C. Qin at University of North Carolina, Chapel Hill, NC, for discussion and help to conduct HRTEM experiments. Y. Yuan is indebted to Dr. T. Nagai for the lecture of JEM 2100F at National Institute for Materials Science, Japan.

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Authors and Affiliations

  1. High Temperature Materials Center, National Institute for Materials Science, Ibaraki, 305-0047, Japan

    Yong Yuan, Yuefeng Gu, Chuanyong Cui, Toshio Osada, Zhihong Zhong, Toshimitsu Tetsui, Tadaharu Yokokawa & Hiroshi Harada

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  1. Yong Yuan
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Yuan, Y., Gu, Y., Cui, C. et al. Influence of Co content on stacking fault energy in Ni–Co base disk superalloys. Journal of Materials Research 26, 2833–2837 (2011). https://doi.org/10.1557/jmr.2011.346

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  • DOI: https://doi.org/10.1557/jmr.2011.346

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