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Local-structure-affected behavior during self-driven grain boundary migration

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Abstract

In nanocrystalline (nc) metals, it is still not clear how local grain boundary (GB) structures accommodate GB migration at atomic scales and what dominates the motion of atoms at the inherently unstable GB front. Here, we report the adjustment of the local GB structures at atomic scales during self-driven GB migration, simultaneously involving GB dissociation, partial dislocation emission from GB, and faceting/defaceting in the nc Cu. Furthermore, we reveal that the fundamental of GB migration ability is closely related to the local structure, i.e. the GB segment consisting of “hybrid” structural units and delocalized GB dislocations is relatively unstable.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (NSFC, grant numbers 51371047 and 51571199), the External Cooperation Program of the Chinese Academy of Sciences (grant no. GJHZ1401), and partially supported by the NSFC (grant No. 51371180).

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, People’s Republic of China

    X. M. Luo, X. F. Zhu, Y. T. Zhou & G. P. Zhang

  2. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, 3-11 Wenhua Road, Shenyang, 110819, People’s Republic of China

    B. Zhang & T. Y. Xiao

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  1. X. M. Luo
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  2. B. Zhang
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  3. X. F. Zhu
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  4. Y. T. Zhou
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  5. T. Y. Xiao
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  6. G. P. Zhang
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Correspondence to G. P. Zhang.

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Luo, X.M., Zhang, B., Zhu, X.F. et al. Local-structure-affected behavior during self-driven grain boundary migration. MRS Communications 6, 85–91 (2016). https://doi.org/10.1557/mrc.2016.10

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