Abstract
While machine-learned interatomic potentials have become a mainstay for modeling materials, designing training sets that lead to robust potentials is challenging. Automated methods, such as active learning and on-the-fly learning, construct reliable training sets, but these processes can be resource-intensive. Current training approaches often use density functional theory calculations that have the same cell size as the simulations that the potential is explicitly trained to model. Here, we demonstrate an easy-to-implement small-cell training protocol and use it to model the Zr-H system. This training leads to a potential that accurately predicts known stable Zr-H phases and reproduces the \(\alpha\)-\(\beta\) pure zirconium phase transition in molecular dynamics simulations. Compared to traditional active learning, small-cell training decreased the training time of the \(\alpha\)-\(\beta\) zirconium phase transition by approximately 20 times. The potential describes the phase transition with a degree of accuracy similar to that of the large-cell training method.
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Data availability
The moment tensor potential file (pot.mtp) and the training set file (train.cfg) are available at https://github.com/jmeziere/Zr-H-Potential.
Notes
The parameters used for the VASP calculations of this training set were not the same as the parameters shown in Table 2. However, the only significant parameter change from the parameters in Table 2 was a change in ENCUT from 400 eV to 500 eV. Because 400 eV is a reasonable value of ENCUT for the Zr system, this should not affect the training results significantly.
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Funding
This work was funded by the Advanced Materials Simulation Engineering Tool (AMSET) project, sponsored by the US Naval Nuclear Laboratory (NNL) and directed by Materials Design, Inc. YL, MRD, and LKB thank the Digital Research Alliance of Canada (formerly known as Compute Canada) for generous allocation of compute resources, and the Natural Sciences and Engineering Research Council of Canada (NSERC) and the NSERC/UNENE Industrial Research Chair in Nuclear Materials at Queen’s for financial support.
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JM: Conceptualization, Methodology, Formal analysis and investigation, Writing—original draft preparation, Writing—review and editing. YL: Formal analysis and investigation, Writing—review and editing. YX: Formal analysis and investigation, Writing—review and editing. LKB: Formal analysis and investigation, Writing—review and editing. MD: Formal Analysis and investigation, Writing—review and edition, Funding acquisition. GLWH: Conceputalization, Methodology, Formal analysis and investigation, Writing—review and edition, Funding acquisition, Resources, Supervision.
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Meziere, J.A., Luo, Y., Xia, Y. et al. Accelerating training of MLIPs through small-cell training. Journal of Materials Research 38, 5095–5105 (2023). https://doi.org/10.1557/s43578-023-01194-4
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DOI: https://doi.org/10.1557/s43578-023-01194-4