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Spatially Resolved Distribution Function and the Medium-Range Order in Metallic Liquid and Glass

机译:金属液体和玻璃中的空间分辨分布函数和中距离有序

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摘要

The structural description of disordered systems has been a longstanding challenge in physical science. We propose an atomic cluster alignment method to reveal the development of three-dimensional topological ordering in a metallic liquid as it undercools to form a glass. By analyzing molecular dynamic (MD) simulation trajectories of a Cu64.5Zr35.5 alloy, we show that medium-range order (MRO) develops in the liquid as it approaches the glass transition. Specifically, around Cu sites, we observe “Bergman triacontahedron” packing (icosahedron, dodecahedron and icosahedron) that extends out to the fourth shell, forming an interpenetrating backbone network in the glass. The discovery of Bergman-type MRO from our order-mining technique provides unique insights into the topological ordering near the glass transition and the relationship between metallic glasses and quasicrystals.
机译:无序系统的结构描述一直是物理科学领域的长期挑战。我们提出一种原子簇排列方法,以揭示金属液体过冷形成玻璃时三维拓扑顺序的发展。通过分析Cu64.5Zr35.5合金的分子动力学(MD)模拟轨迹,我们显示出随着液体趋向玻璃化转变,在液体中逐渐形成了中程有序(MRO)。具体而言,在铜的周围,我们观察到“伯格曼三面体”堆积物(二十面体,十二面体和二十面体)延伸到第四壳,在玻璃中形成互穿的主干网络。通过我们的有序采矿技术发现的伯格曼型MRO,为玻璃化转变附近的拓扑有序化以及金属玻璃与准晶体之间的关系提供了独特的见解。

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