随机固溶体的热空位形成能
材料科学
2017-02-13 v1
摘要
当密排无序合金发生有序化转变时,空位机制在原子迁移中占主导地位。然而,由于难以考虑各种局部原子环境,随机固溶体的热空位形成能(VFEs)的计算通常很繁琐。在此,我们提出一种透明的方法,结合相干势近似(coherent potential approximation)和超晶胞局域团簇展开(supercell-local cluster expansion)来研究随机固溶体的 VFEs。该方法用于研究温度、应变和磁性对随机 A1-FePt 合金 VFEs 的影响。结果表明,平均 VFE 随温度升高而增大,在 (001) 面内拉伸和压缩应变下减小,并可由磁激发进一步降低。通过讨论 VFE 对局部原子环境及整体键合强度的依赖性解释了这些效应。
引用
@article{arxiv.1702.03104,
title = {Thermal vacancy formation energies of random solid solutions},
author = {H. B. Luo and Q. M. Hu and J. Du and A. R. Yan and J. P. Liu},
journal= {arXiv preprint arXiv:1702.03104},
year = {2017}
}
备注
9 pages, 5 figures and 1 table. This work was mainly finished in the end of 2015, with some modification of the definition of VFE later. Since then, all authors, including Prof. Ruban in KTH, have got the original manuscript and commented the method and the results