Direct imaging of atomistic grain boundary migration

Abstract

Grain boundary (GB) migration plays an important role in modifying the microstructures and the related properties of polycrystalline materials, and is governed by the atomistic mechanism by which the atoms are displaced from one grain to another. Although such an atomistic mechanism has been intensively investigated, it is still experimentally unclear as to how the GB migration proceeds at the atomic scale. With the aid of high-energy electron-beam irradiation in atomic-resolution scanning transmission electron microscopy, we controllably triggered the GB migration in α-Al2O3 and directly visualized the atomistic GB migration as a stop motion movie. It was revealed that the GB migration proceeds by the cooperative shuffling of atoms on GB ledges along specific routes, passing through several different stable and metastable GB structures with low energies. We demonstrated that GB migration could be facilitated by the GB structural transformations between these low-energy structures.

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Fig. 1: Experimental set-up of the controlled GB migration in the STEM.
Fig. 2: Step-by-step imaging of the GB migration.
Fig. 3: Column-by-column imaging of the atomistic process for GB motion.
Fig. 4: Dichromatic pattern of the atomistic geometry and structural transformations for GB migration (see Supplementary Video 3).

Data availability

The data that support the findings of this study are available within the article and its Supplementary Information. Any other relevant data are also available upon reasonable request from the corresponding authors.

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Acknowledgements

We thank S. Kondo and E. Tochigi from the University of Tokyo for useful discussion. We also acknowledge A. Kumamoto from the University of Tokyo for his technical support with the electron microscope. This work was supported by Grants-in-Aid for Specially Promoted Research (Grant no. JP17H06094), and Grant-in-Aid for Scientific Research on Innovative Areas (Grant no. JP19H05788 and JP19H05786). B.F. acknowledges a Grant-in-Aid for Early-Career Scientists (JP18K13982) from the JSPS. This work was supported by the Nanotechnology Platform project by the Ministry of Education, Culture, Sports, Science and Technology of Japan (grant no. JPMXP09A20UT0146). A part of this work was also supported by the Elements Strategy Initiative for Structural Materials (ESISM) from the Ministry of Education, Culture, Sports, Science and Technology in Japan (MEXT).

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Authors

Contributions

B. F. and J.W. designed the experiments. J.W. carried out the experiments, analysed the data, figured out the story and wrote the manuscript. B.F. discussed the results, revised the manuscript and supervised the project. R.I. discussed the results and revised the manuscript. T.Y. and K.M. conducted the calculations and revised the manuscript. N.S. revised the manuscript and helped supervise the project. Y.I. revised the manuscript and directed the entire study.

Corresponding authors

Correspondence to Bin Feng or Yuichi Ikuhara.

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The authors declare no competing interests.

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Peer review information Nature Materials thanks the anonymous reviewers for their contribution to the peer review of this work.

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Supplementary information

Supplementary Information

Supplementary Notes 1 and 2, Figs. 1–6, captions of Videos 1–3 and references.

Supplementary Video 1

Movie sequentially showing the step-by-step images in Supplementary Fig. 1 at 0.5 second per frame.

Supplementary Video 2

Movie sequentially showing the step-by-step images in Supplementary Fig. 1 in higher magnification at 0.5 second per frame.

Supplementary Video 3

Schematic movie for the atomistic and structural transformation process of GB migration.

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Wei, J., Feng, B., Ishikawa, R. et al. Direct imaging of atomistic grain boundary migration. Nat. Mater. (2021). https://doi.org/10.1038/s41563-020-00879-z

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