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Quantitative analysis of spatial distribution of nucleation sites: microstructural implications

机译:成核位点空间分布的定量分析:微观结构意义

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摘要

Various computational schemes for thedetermination of nucleation conditions from fullycoalesced product microstructures are examined. Inparticular, a variety of types of nucleation sites,including those on the edges and corners of an underlyingstructure are considered. The analysis is facilitatedby simulating idealized cases wherein the nucleationconditions are known. In cases where only one type ofsite is active, the spatial distribution of nucleationsites is quantified in terms of neighbor distributionsand correlation functions. In cases of multiple typesof site potency, maps revealing importantmicrostructural behavior and trends are constructed. Itis found that the dimensionality of the subspace of siteson which nucleation occurs can be described and therebythe unique signatures of bulk, edge and cornernucleation in the calculated quantities can beidentified. The results of the simulations allowpossible nucleation conditions to be identified whichgive rise to a given experimental microstructure.
机译:研究了用于确定完全聚结产物微观结构成核条件的各种计算方案。特别是,考虑了各种类型的成核位点,包括下层结构的边缘和角落上的成核位点。通过模拟已知成核条件的理想化情况来促进分析。在只有一种类型的位点处于活动状态的情况下,成核位点的空间分布根据相邻分布和相关函数进行量化。在多种类型的位点效力的情况下,构建了揭示重要微观结构行为和趋势的图谱。研究发现,可以描述发生成核的位点的子空间的维数,从而可以识别计算量中体积、边缘和角成核的独特特征。模拟结果允许识别可能的成核条件,从而产生给定的实验微观结构。

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