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Convolutional neural network-assisted recognition of nanoscale L12 ordered structures in face-centred cubic alloys

MPS-Authors
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Li,  Yue
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Zhou,  Xuyang
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Colnaghi,  Timoteo
Max Planck Computing and Data Facility, Max Planck Society;

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Wei,  Ye
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Marek,  Andreas
Computer Center Garching (RZG), Max Planck Institute for Plasma Physics, Max Planck Society;

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Bauer,  Stefan
Dept. Empirical Inference, Max Planck Institute for Intelligent Systems, Max Planck Society;

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Rampp,  Markus
Computer Center Garching (RZG), Max Planck Institute for Plasma Physics, Max Planck Society;

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Stephenson,  Leigh
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Supplementary Material (public)

s41524-020-00472-7.pdf
(Supplementary material), 4MB

Citation

Li, Y., Zhou, X., Colnaghi, T., Wei, Y., Marek, A., Li, H., et al. (2021). Convolutional neural network-assisted recognition of nanoscale L12 ordered structures in face-centred cubic alloys. npj Computational Materials, 7(1): 8. doi:10.1038/s41524-020-00472-7.


Cite as: http://hdl.handle.net/21.11116/0000-0007-B685-5
Abstract
Nanoscale L12-type ordered structures are widely used in face-centered cubic (FCC) alloys to exploit their hardening capacity and thereby improve mechanical properties. These fine-scale particles are typically fully coherent with matrix with the same atomic configuration disregarding chemical species, which makes them challenging to be characterized. Spatial distribution maps (SDMs) are used to probe local order by interrogating the three-dimensional (3D) distribution of atoms within reconstructed atom probe tomography (APT) data. However, it is almost impossible to manually analyze the complete point cloud (gt;10 million) in search for the partial crystallographic information retained within the data. Here, we proposed an intelligent L12-ordered structure recognition method based on convolutional neural networks (CNNs). The SDMs of a simulated L12-ordered structure and the FCC matrix were firstly generated. These simulated images combined with a small amount of experimental data were used to train a CNN-based L12-ordered structure recognition model. Finally, the approach was successfully applied to reveal the 3D distribution of L12–type δ′–Al3(LiMg) nanoparticles with an average radius of 2.54 nm in a FCC Al-Li-Mg system. The minimum radius of detectable nanodomain is even down to 5 Å. The proposed CNN-APT method is promising to be extended to recognize other nanoscale ordered structures and even more-challenging short-range ordered phenomena in the near future. © 2021, The Author(s).