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Study on the relationship between TCP phase and AlN phase in a fourth-generation single-crystal superalloy

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Abstract

The enhanced mechanical properties of Ni-based single-crystal superalloys induced by refractory elements such as Re, Wo, Mo, etc. are essential for the manufacture of advanced aero engines’ turbine blades. Whereas these elements could promote the formation of the topologically close-packed (TCP) phases, and their growth would have a deleterious effect on the creep rupture life of single-crystal superalloys. Concomitantly, the formation of the brittle phase of the internal nitrides, especially the aluminium nitride (AlN), would be detrimental to superalloys as well. Nonetheless, the formation relationship between AlN and TCP phases has maintained opaque. In this study, the relationship between the TCP phase and AlN phase was analysed by microscopic methods, such as BSE, TEM and EDS. An AlN phase located near the TCP phase in the deep surface of the superalloy was found, and its formation was suggested to be related to nitrogen penetration during the thermal exposure. This accompanying growth of the AlN phase and TCP phase in the deep surface could provide a new perspective on the formation mechanism of these brittle phases in the Ni-based single-crystal superalloys.

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Acknowledgement

This study was financially supported by the National Natural Science Foundation of China (Grant No. 51971203).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Zhezhu Lao, Qingqing Ding, Hongbin Bei, Ze Zhang & Jixue Li

  2. Center of Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou, 310027, China

    Hua Wei

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  1. Zhezhu Lao
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  2. Qingqing Ding
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  3. Hongbin Bei
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  4. Ze Zhang
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  5. Hua Wei
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Correspondence to Zhezhu Lao.

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Lao, Z., Ding, Q., Bei, H. et al. Study on the relationship between TCP phase and AlN phase in a fourth-generation single-crystal superalloy. Bull Mater Sci 46, 126 (2023). https://doi.org/10.1007/s12034-023-02967-7

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  • DOI: https://doi.org/10.1007/s12034-023-02967-7

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