arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.2500cond-mat.mtrl-sci
收藏

(Meta)稳定有序、部分有序和无序Al-Li合金相的结构性质和相对稳定性

Structural Properties and Relative Stability of (Meta)Stable Ordered, Partially-ordered and Disordered Al-Li Alloy Phases

Aftab Alam, D. D. Johnson

摘要:

我们解决了困扰可靠预测的相对相稳定性的固溶体和化合物的问题。由于其商业上重要的相图,我们展示了铝锂系统,因为历史上的密度泛函理论(DFT)的结果显示出较大的分散性和有限的成功预测相对于有序化合物的固溶体的结构性质和稳定性。使用最近的进展,在一个最佳的基组表示的拓扑结构的电子电荷密度(因此,原子大小),我们提出的DFT结果,同意合理以及与所有已知的实验数据的有序,非化学计量的部分有序和无序合金的结构特性和形成能,开辟了可靠的研究复杂合金的方式。

英文摘要:

We resolve issues that have plagued reliable prediction of relative phase stability for solid-solutions and compounds. Due to its commercially important phase diagram, we showcase Al-Li system because historically density-functional theory (DFT) results show large scatter and limited success in predicting the structural properties and stability of solid-solutions relative to ordered compounds. Using recent advances in an optimal basis-set representation of the topology of electronic charge density (and, hence, atomic size), we present DFT results that agree reasonably well with all known experimental data for the structural properties and formation energies of ordered, off-stoichiometric partially-ordered and disordered alloys, opening the way for reliable study in complex 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。

↑