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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Ab initio simulations of geometrical frustration in supercooled liquid Fe and Fe-based metallic glass
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Ab initio simulations of geometrical frustration in supercooled liquid Fe and Fe-based metallic glass

机译:过冷液态Fe和Fe基金属玻璃中几何挫折的从头算模拟

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摘要

We investigate short range order in liquid and supercooled liquid Fe and Fe-based metallic glass using ab initio simulation methods. We analyze the data to quantify the degree of local icosahedral and polytetrahedral order and to understand the role of alloying in controlling the degree of geometric frustration. Comparing elemental Fe to Cu [P. Ganesh and M. Widom, Phys. Rev. B 74, 134205 (2006)] we find that the degree of icosahedral order is greater in Fe than in Cu, possibly because icosahedral disclination line defects are more easily incorporated into bcc environments than fcc. In Fe-based metallic glass-forming alloys (FeB and FeZrB) we find that introducing small concentrations of small B atoms and large Zr atoms controls the frustration of local icosahedral order.
机译:我们使用从头算起的方法研究了液态和过冷液态Fe和Fe基金属玻璃的短程有序。我们分析数据以量化局部二十面体和多四面体有序的程度,并了解合金化在控制几何受挫程度中的作用。比较元素铁和铜[P。 Ganesh和M. Widom,物理学。 B 74,134205(2006)。[Rev. B 74,134205(2006)],我们发现Fe中的二十面体有序度比Cu中的大,可能是因为二十面体错位线缺陷比fcc更容易混入bcc环境中。在铁基金属玻璃形成合金(FeB和FeZrB)中,我们发现引入低浓度的小B原子和大的Zr原子可控制局部二十面体有序的形成。

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