arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2312.17596cond-mat.mtrl-sci
收藏

一种用于镍的“磁性”机器学习原子间势

A "Magnetic" Machine Learning Interatomic Potential for Nickel

Xiaoguo Gong, Zhuoyuan Li, A. S. L. Subrahmanyam Pattamatta, Tongqi Wen, David J. Srolovitz

AI总结:

针对自旋极化DFT计算大体系长时模拟效率低的问题,研究人员开发了无需磁矩描述符的镍“磁性隐藏”DP机器学习原子间势,可精准模拟多类性质与相变,为相关合金势开发奠基。

摘要:

镍(Ni)是一种磁性过渡金属,具有稳定的面心立方(FCC)和亚稳态六方密排(HCP)两种同素异形相,广泛应用于结构材料领域。磁性会影响诸多力学性能和缺陷特性,但对于需要大体系尺寸和/或长模拟时间的材料行为研究,自旋极化密度泛函理论(DFT)计算的计算效率较低。本文中,我们利用源自自旋极化DFT计算的训练数据集,开发了一种无需磁矩描述符的镍的“磁性隐藏”机器学习Deep Potential(DP,深度势)模型。该“磁性隐藏”DP-Ni模型对FCC和HCP的广泛性质(包括(有限温度下的)晶格参数、弹性常数、声子谱以及多种缺陷)展现出高迁移性和表征能力。作为其适用性的一个示例,我们研究了(高应力)单轴拉伸载荷下镍的FCC-HCP同素异形相变。该磁性镍的DP模型可支撑针对复杂力学行为的高精度大规模原子模拟,并为开发镍基高温合金及其他多主元合金的原子间势奠定基础。

英文摘要:

Nickel (Ni) is a magnetic transition metal with two allotropic phases, stable face-centered cubic (FCC) and metastable hexagonal close-packed (HCP), widely used in structural applications. Magnetism affects many mechanical and defect properties, but spin-polarized density functional theory (DFT) calculations are computationally inefficient for studying material behavior requiring large system sizes and/or long simulation times. Here we develop a "magnetism-hidden" machine-learning Deep Potential (DP) model for Ni without a descriptor for magnetic moments, using training datasets derived from spin-polarized DFT calculations. The "magnetism-hidden" DP-Ni model exhibits high transferability and representability for a wide-range of FCC and HCP properties, including (finite-temperature) lattice parameters, elastic constants, phonon spectra, and many defects. As an example of its applicability, we investigate the Ni FCC-HCP allotropic phase transition under (high-stress) uniaxial tensile loading. The DP model for magnetic Ni facilitates accurate large-scale atomistic simulations for complex mechanical behavior and serves as a foundation for developing interatomic potentials for Ni-based superalloys and other multi-principal component alloys.

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。

↑