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Atom Probe Tomography Study of Fe Segregation at Phase Interface in Zr–2.5Nb Alloy

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Abstract

β-Nb is a typical second phase in Zr–Nb-based alloys used as fuel claddings in water-cooled nuclear reactors. The segregation of alloying element Fe may affect the corrosion resistance of Zr–Nb-based alloys. In this work, the Fe segregation at the interface between β-Nb phase and α-Zr matrix in Zr–2.5Nb alloy was studied using atom probe tomography and focused ion beam. The results suggested that the Fe concentration was much lower than Nb concentration in α-Zr matrix, while Fe selectively segregated at the β-Nb/α-Zr phase interface, leading to a Fe concentration peak at some interfaces. The peak Fe concentration varied from 0.4 to 1.2 at.% and appeared at the position where Zr concentration was approximately equal to Nb concentration. The selective segregation of Fe should be affected by the heat treatment and structure defects induced by cold rolling.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51171102). The authors are grateful to Prof. Wenqing Liu and Prof. Pengfei Hu in Laboratory for Microstructures of Shanghai University for their assistance in the microstructural analysis.

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Authors and Affiliations

  1. Institute of Materials, Shanghai University, Shanghai, 200072, China

    Xue Liang, Qiang Li, Mei-Yi Yao & Hui Li

  2. Laboratory for Microstructures, Shanghai University, Shanghai, 200444, China

    Xue Liang, Qiang Li, Mei-Yi Yao & Hui Li

  3. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

    Jiao Huang

  4. School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China

    Qing-Dong Liu

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  1. Xue Liang
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  2. Qiang Li
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  3. Jiao Huang
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  4. Mei-Yi Yao
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  5. Hui Li
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Correspondence to Xue Liang.

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Liang, X., Li, Q., Huang, J. et al. Atom Probe Tomography Study of Fe Segregation at Phase Interface in Zr–2.5Nb Alloy. Acta Metall. Sin. (Engl. Lett.) 32, 1281–1286 (2019). https://doi.org/10.1007/s40195-019-00927-x

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  • DOI: https://doi.org/10.1007/s40195-019-00927-x

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