Abstract
Exploring the alloying effect of various elements plays a crucial role in optimizing the alloy design for superalloys. In this study, the influence of Nb additions on a γ′-strengthening CoNi-based superalloy has been investigated. Undesirable intermetallic phases including the topologically close-packed D85 phase and the ordered D019 phase were observed to preferentially form in the dendritic and interdendritic regions of the investigated alloy, respectively. Precipitation behaviors of the D019 phase and the D85 phase including growth mechanisms and crystallographic orientation relationships have been characterized and analyzed in detail using advanced electron microscopy techniques. First-principle calculations using density function theory have been carried out to evaluate the effect of Nb additions on the thermodynamic stability of the L12-γ′ phase. It turns out that the supercell with L12 structure would be energetically destabilized when the Nb-substituted atom sits on the Co or Al sites, which could correspond to the microstructural instability of the Nb-containing CoNi-based superalloy.
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Acknowledgments
C. Zhang would like to acknowledge financial support from the National Natural Science Foundation of China (Grant 51771097), Tsinghua University Initiative Scientific Research Program, the National Key Research and Development Plan (Grant 2017YFB0305201), and the Science Challenge Project (Grant TZ2018004). Z. Fan would like to give a special thanks to his wife for her professional advice in color selection of figures, to Dr. Geng Liu (Tsinghua University, China) for his technical help on several experiments, and also to Dr. Zhenghao Chen (Kyoto University, Japan) for his professional comments on the manuscript.
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Fan, Z., Wang, X., Yang, Y. et al. Microstructural Instability and Precipitation Behaviors of Intermetallic Phases in a Nb-Containing CoNi-Based Superalloy. Metall Mater Trans A 51, 2495–2508 (2020). https://doi.org/10.1007/s11661-020-05710-7
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DOI: https://doi.org/10.1007/s11661-020-05710-7