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Phase-Field Simulation of D019-Co3W Precipitation in Co–Al–W Superalloys

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Abstract

The γ′-Co3(Al, W) precipitates embedded in the γ matrix are a preferred morphology in Co–Al–W superalloys, while the stable χ (D019-Co3W) phase precipitates from the metastable γ′ phase or γ matrix during long-term aging at high temperature. The χ phase from precipitation to growth and coarsening in Co–10Al–10W at. pct alloy is studied by a phase-field model coupled with the sublattice free energy. The ordering of D019 is faster than the component occupation on the sublattice. The equilibrium partitioning ratios (PR) of elements show that W partitions into the χ phase. With increasing temperature from 1073 K to 1173 K, PR changes from 13.9 to 9.2, and Al partitions into the γ matrix with PR changing from 0.0086 to 0.0717. The diffusion potential explains the directional coalescence of the χ phase along the \([111]_{\gamma }\) direction, and indicates that the elastic contribution is dominant in W diffusion and that the chemical contribution is dominant in Al diffusion. The composition interface of the γ/χ phase is widened during Ostwald ripening of the strip-shaped χ phase. The straightforward view of χ phase precipitation helps in understanding the complex phase structural transformation in Co-based superalloys.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51571122) and the Fundamental Research Funds for the Central Universities (No. 30921013107).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Xiaoyuan Zhang, Yongsheng Li, Shujing Shi, Huiyu Wang & Zihao Cheng

  2. MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, Nanjing, 210094, China

    Xiaoyuan Zhang, Yongsheng Li, Shujing Shi, Huiyu Wang & Zihao Cheng

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  1. Xiaoyuan Zhang
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Correspondence to Yongsheng Li.

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Zhang, X., Li, Y., Shi, S. et al. Phase-Field Simulation of D019-Co3W Precipitation in Co–Al–W Superalloys. Metall Mater Trans A 53, 2048–2059 (2022). https://doi.org/10.1007/s11661-022-06647-9

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