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Thermally-triggered grain boundary relaxation in a nanograined Ni-Mo-W alloy

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Abstract

Conventionally, nanograined metals and alloys can be stabilized through segregating foreign elements at grain boundaries (GBs). Yet such an effect may be offset by formation of second phase at elevated temperatures. In this paper, by introducing minor W into a binary Ni-Mo alloy, we found precipitation of intermetallic phases was suppressed, enhancing thermal stability of the nanograined structure. Characterized faceted GBs and a high-fraction of Σ3 coincidence site lattice (CSL) boundaries illustrate that GB structures are relaxed by formation of copious annealing twins. Adding W reduces stacking fault energy of the solid solution and facilitates the thermally-triggered GB relaxation. Suppressed precipitation of the intermetallic phases may be attributed to depletion of solutes at relaxed GBs.

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Acknowledgements

The authors are grateful for financial support from the Ministry of Science and Technology of China (No. 2017YFA0204401), Liaoning Revitalization Talents Program (No. XLYC1808008), and Liaoning Science and Technology Development Program (No. 2021JH6/10500102).

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Dongsong Zeng, Jiongxian Li, Yinong Shi, Xiuyan Li & Ke Lu

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Dongsong Zeng

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  1. Dongsong Zeng
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  2. Jiongxian Li
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  3. Yinong Shi
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  5. Ke Lu
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Correspondence to Yinong Shi.

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Zeng, D., Li, J., Shi, Y. et al. Thermally-triggered grain boundary relaxation in a nanograined Ni-Mo-W alloy. Nano Res. 16, 12800–12808 (2023). https://doi.org/10.1007/s12274-023-6186-9

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  • DOI: https://doi.org/10.1007/s12274-023-6186-9

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