arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2607.00540cond-mat.mtrl-sci
收藏

一种用于铌的通用原子团簇展开相互作用势

A general-purpose atomic cluster expansion interatomic potential for niobium

Center for Advanced Systems Understanding (CASUS)(先进系统理解中心);Helmholtz-Zentrum Dresden-Rossendorf (HZDR)(德累斯顿-罗斯多夫亥姆霍兹中心);ICAMS, Ruhr-Universität Bochum(波鸿鲁尔大学综合分析与建模中心)

Aleksei Egorov, Ralf Drautz, Thomas Hammerschmidt

AI总结:

针对铌的复杂性质,构建了通用原子团簇展开势,在数千DFT结构上训练,平衡精度、效率和鲁棒性,实现近DFT精度的大规模模拟。

摘要:

铌是一种体心立方过渡金属,对原子间势构成了挑战,因为原子间势难以捕捉其特性,如声子、高压行为、位错滑移能垒等。为了解决这一挑战,我们为铌构建了一个通用原子团簇展开势。我们在数千个涵盖多种局部环境的密度泛函理论结构上训练了我们的ACE。我们在一系列性质上对其进行了验证,并将其与现有的经验势和机器学习势(包括一种新颖的通用机器学习势)进行了比较。得到的ACE平衡了精度、效率和鲁棒性,使得能够以接近DFT的精度对铌进行大规模探索。最后,我们的ACE在一项严格的测试中表现出色:一个近百万原子的断裂分子动力学模拟。

英文摘要:

Niobium, a body-centered cubic transition metal, poses a challenge for interatomic potentials, which struggle to capture its properties, such as phonons, high-pressure behavior, energy barriers to dislocation glide, and others. To tackle this challenge, we constructed a general-purpose atomic cluster expansion (ACE) potential for niobium. We trained our ACE on thousands of density functional theory (DFT) structures spanning a diversity of local environments. We validated it across a range of properties and compared it with existing empirical and machine learning (ML) potentials, including a novel universal ML potential. The resulting ACE balances accuracy, efficiency, and robustness, enabling large-scale exploration of niobium with near-DFT precision. Finally, our ACE held its own in a stringent test: a near-million-atom molecular dynamics simulation of fracture

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑