A series of simulated atom probe datasets were examined with a friends-of-friends method to establish the detection efficiency required to resolve solute clusters in the ferrite phase of a 14YWT nanostructured ferritic alloy. The size and number densities of solute clusters in the ferrite of the as-milled mechanically-alloyed condition and the stir zone of a friction stir weld were estimated with a prototype high-detection-efficiency (similar to 80%) local electrode atom probe. High number densities, 1.8 x 10(24) m(-3) and 1.2 x 10(24) m(-3), respectively of solute clusters containing between 2 and 9 solute atoms of Ti, Y and O and were detected for these two conditions. These results support first principle calculations that predicted that vacancies stabilize these Ti-Y-O-clusters, which retard diffusion and contribute to the excellent high temperature stability of the microstructure and radiation tolerance of nanostructured ferritic alloys. (C) 2014 Elsevier B.V. All rights reserved.
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机译：使用Friends-of-Friends方法检查了一系列模拟的原子探针数据集，以建立解析14YWT纳米结构铁素体合金的铁素体相中的溶质团簇所需的检测效率。使用原型高检测效率（类似于80％）的局部电极原子探针，估算了铣削机械合金化条件下铁素体中的溶质团簇的大小和数量密度以及摩擦搅拌焊的搅拌区。分别检测到含有2、9个Ti，Y和O溶质原子的溶质簇的高数密度分别为1.8 x 10（24）m（-3）和1.2 x 10（24）m（-3）两个条件。这些结果支持第一原理计算，该计算预测空位使这些Ti-Y-O团簇稳定，这会延缓扩散并有助于纳米结构的铁素体合金的微观结构具有出色的高温稳定性和耐辐射性。 （C）2014 Elsevier B.V.保留所有权利。
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