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Recognition and analysis of local structure in polycrystalline configurations

机译:多晶构型中局部结构的识别和分析

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摘要

A method is described for obtaining information about the local order existing in monoatomic model solids or real materials based on their atomistic configurations. An efficient algorithmic implementation is provided. The shape of the polyhedra formed by 'relevant' neighbors of each atom enter a pattern recognition method to resolve the type of the (usually non-ideal) crystal structure to which atoms surrounded by their relevant neighbors belong: hexagonal close-packed, face-centered cubic or body-centered cubic. Further, this approach allows for the analysis of icosahedral structure which preferably occurs in amorphous solids. Results of a molecular dynamics computer simulation illustrate how this method can be applied to contribute to an understanding of the mechanical and structural properties of solids (i) undergoing a steady shear stress and (ii) upon increasing temperature.
机译:描述了一种用于基于单原子模型固体或真实材料的原子构型获取有关存在于本地顺序的信息的方法。提供了一种有效的算法实现。由每个原子的“相关”邻居形成的多面体的形状进入一种模式识别方法,以解析由其相关邻居包围的原子所属的(通常是非理想的)晶体结构的类型:六方密堆积,面状居中立方或以身体为中心的立方。此外,该方法允许分析优选在无定形固体中发生的二十面体结构。分子动力学计算机模拟的结果说明了如何使用此方法有助于理解固体(i)承受稳定的剪切应力和(ii)升高温度时的机械和结构性质。

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