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Effect of temperature on the tensile deformation behavior and fracture mechanism of a transient liquid-phase bonding joint of γ′-strengthened Co-based single-crystal superalloy

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Abstract

Tensile behavior at different deformation temperature of a transient liquid-phase (TLP) bonded joint of γ′-strengthened Co-based superalloy was investigated. A temperature dependence phenomenon of the joint’s fracture position was found, which transferred from the base metal to the bonding area with increase in the temperature, and this is related to the deformation mechanism. At room temperature, dislocation shearing the γ′ phases in different areas of the joint domains the deformation and makes it heterogeneous, and more deformation has occurred at the BM because of lower content of γ′ phase, which makes the failure occurred at the BM. The deformation mechanism gradually transferred from dislocation shearing to bypassing the γ′ with increasing the temperature, making the deformation become diffused, and this can lead to the fracture of the joint’s brittle borides, and the coalescence of the boride-induced cracks makes the fracture occur at the diffusion affect zone at 600 °C~ 900 °C. As the secondary-γ′ in the joint’s isothermal solidification zone dissolves at 1000 °C, more deformation occurs there and the accumulation of micro-voids induced by the dislocation climbing leads to the fracture.

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Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

This research was funded by the National Key R&D Program of China under Grant No.2021YFB3700401 and Key Specialized Research and Development Breakthrough—unveiling and commanding the special project program in Liaoning province under Grant No. 2021JH15.

Funding

National Natural Science Foundation of China, 2021YFB3700401, Y. H. Yang, Key Specialized Research and Development Breakthrough–unveiling and commanding the special project program in Liaoning province, 2021JH15, Yuan Sun.

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China

    S. Y. Wang, X. Y. Hou, Y. Cheng, Y. Sun, Y. H. Yang, J. G. Li, H. W. Zhang & Y. Z. Zhou

  2. School of Materials Science and Engineering, University of Science and Technology of China, 96, JinZhai Road, Hefei, 230026, China

    Y. Cheng

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Wang, S.Y., Hou, X.Y., Cheng, Y. et al. Effect of temperature on the tensile deformation behavior and fracture mechanism of a transient liquid-phase bonding joint of γ′-strengthened Co-based single-crystal superalloy. J Mater Sci 57, 12012–12033 (2022). https://doi.org/10.1007/s10853-022-07351-0

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