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The Element Segregation Between γ/γʹ Phases in a Ni-Based Single Crystal Superalloy Studied by 3D-APT and Its Potential Impact on Local Interfacial Misfit Strain

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Abstract

Three-dimensional atom-probe tomography was used to characterize the γ/γʹ interface structure in a third-generation Ni-based single crystal superalloy with Re addition. It was found that an element-segregation layer with Re, Co and Cr was formed in the γ phase close to the γ/γ′ interface, resulting in a more negative local interface misfit (− 0.29%) compared to the measured result (− 0.16%) from high-resolution X-ray diffraction. Furthermore, the total reduction of interfacial free energy due to the solute atom segregation based on the Gibbsian interfacial excess was calculated to indicate that Re element was the most beneficial element in producing this more negative local misfit with the largest interfacial free energy reduction (13.67 ± 0.21 mJ/m2). Simultaneously, because of the co-segregation of Re, Co and Cr, and the depletion of Ni in the γ phase close to the γ/γ′ interface, it was also deduced that some harmful topologically close-packed phases might be easier to nucleate and grow in the γ phase close to the γ/γ′ interface in service.

Graphic Abstract

The element-segregation layer across γ/γ′ interface resulted in a more negative local interface misfit (− 0.29%), compared to the measured result (− 0.16%) from highresolution X-ray diffraction, and the total reduction of interfacial free energy due to the solute atom segregation was calculated to indicate that Re element was the most beneficial element in producing this more negative local misfit with the largest interfacial free energy reduction (13.67 ± 0.21 mJ/m2).

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Acknowledgements

This work was funded by the National Science and Technology Major Project (2017-VI-0002-0072), National Natural Science Foundation of China (51771148, 51631008, 51690163); Natural Science Basic Research Plan in Shaanxi Province of China (2019JM-319), Fundamental Research Funds for the Central Universities (3102018JCC009, 3102019PB001), Research Fund of the State Key Laboratory of Solidification Processing (NPU), China (2019-TS-11) and the Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University (ZZ2019079).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    Wenchao Yang, Pengfei Qu, Jiarun Qin, Chen Liu, Jun Zhang & Lin Liu

  2. Ministry of Education Key Laboratory of Micro/Nano Systems for Aerospace, School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Ruirong Zhang

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  1. Wenchao Yang
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  2. Pengfei Qu
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  3. Ruirong Zhang
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  4. Jiarun Qin
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  5. Chen Liu
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  6. Jun Zhang
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  7. Lin Liu
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Correspondence to Wenchao Yang or Ruirong Zhang.

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Yang, W., Qu, P., Zhang, R. et al. The Element Segregation Between γ/γʹ Phases in a Ni-Based Single Crystal Superalloy Studied by 3D-APT and Its Potential Impact on Local Interfacial Misfit Strain. Met. Mater. Int. 27, 1892–1896 (2021). https://doi.org/10.1007/s12540-019-00534-6

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