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An artificial neural network potential for uranium metal at low pressures |
Maosheng Hao(郝茂生) and Pengfei Guan(管鹏飞)† |
Beijing Computational Science Research Center, Beijing 100193, China |
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Abstract Based on machine learning, the high-dimensional fitting of potential energy surfaces under the framework of first principles provides density-functional accuracy of atomic interaction potential for high-precision and large-scale simulation of alloy materials. In this paper, we obtained the high-dimensional neural network (NN) potential function of uranium metal by training a large amount of first-principles calculated data. The lattice constants of uranium metal with different crystal structures, the elastic constants, and the anisotropy of lattice expansion of alpha-uranium obtained based on this potential function are highly consistent with first-principles calculation or experimental data. In addition, the calculated formation energy of vacancies in alpha- and beta-uranium also matches the first-principles calculation. The calculated site of the most stable self-interstitial and its formation energy is in good agreement with the findings from density functional theory (DFT) calculations. These results show that our potential function can be used for further large-scale molecular dynamics simulation studies of uranium metal at low pressures, and provides the basis for further construction of potential model suitable for a wide range of pressures.
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Received: 27 March 2023
Revised: 22 May 2023
Accepted manuscript online: 25 May 2023
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PACS:
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84.35.+i
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(Neural networks)
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34.20.Cf
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(Interatomic potentials and forces)
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71.20.Gj
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(Other metals and alloys)
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Fund: We acknowledge the computational support from Beijing Computational Science Research Center (CSRC). Project supported by the National Natural Science Foundation of China (Grant Nos. 52161160330 and U2230402). |
Corresponding Authors:
Pengfei Guan
E-mail: pguan@csrc.ac.cn
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Cite this article:
Maosheng Hao(郝茂生) and Pengfei Guan(管鹏飞) An artificial neural network potential for uranium metal at low pressures 2023 Chin. Phys. B 32 098401
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