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Microstructure and creep properties of Ni-based single-crystal superalloys with Mo/Al addition at 760 °C/850 MPa

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Abstract

The effect of Mo and Al addition on the microstructure as well as creep rupture properties at 760 °C/850 MPa was investigated by transmission electron microscopy (TEM) in a Ni-based single-crystal (SC) alloy with the composition of Ni–6.5Al–8.0Mo–2.4Cr–6.2Ta–4.9Co–1.5Re–(0.01–0.05)Y (wt%). The microstructure analysis shows that 0.5 wt% Al addition induces rapid decrease in creep rupture life, and this can be attributed to the formation of dense stacking faults cutting into γ′ precipitates, which can be explained by the increase in Orowan stress caused by the narrower γ channel width and the decrease in stacking faults energy. Besides, 1.5 wt% Mo addition increases the anti-phase boundary energy and decreases the stacking faults energy, resulting in fewer stacking faults and thus a slight decrease in the creep rupture life.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (No. 51101004).

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Authors and Affiliations

  1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Pei-Shan Cao, Hui Wang, Yi Ru, Yun-Fei Liang & Sheng-Kai Gong

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  1. Pei-Shan Cao
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  2. Hui Wang
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  3. Yi Ru
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  5. Sheng-Kai Gong
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Correspondence to Hui Wang.

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Cao, PS., Wang, H., Ru, Y. et al. Microstructure and creep properties of Ni-based single-crystal superalloys with Mo/Al addition at 760 °C/850 MPa. Rare Met. 42, 3806–3813 (2023). https://doi.org/10.1007/s12598-018-1094-y

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  • DOI: https://doi.org/10.1007/s12598-018-1094-y

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