Point excess solute: A new metric for quantifying solute segregation in atom probe tomography datasets including application to naturally aged solute clusters in Al-Mg-Si-(Cu) alloys
Point excess solute: A new metric for quantifying solute segregation in atom probe tomography datasets including application to naturally aged solute clusters in Al-Mg-Si-(Cu) alloys
复制标题
点过量溶质：一种用于量化原子探针断层扫描数据集中溶质偏析的新指标，包括应用于 Al-Mg-Si-(Cu) 合金中自然老化的溶质簇
DOI：
10.1016/j.matchar.2023.113402
复制
发表时间：
2023
影响因子：
4.7
通讯作者：
Famelton J
中科院分区：
文献类型：
--
作者：
Famelton J
对原子探针断层扫描 (APT) 数据集中的纳米级溶质聚类进行准确、可重复和定量分析是一项复杂的挑战，由于该技术固有的位置不确定性和绝对分辨率的缺乏，使分析变得更加困难。在这项工作中，引入了一种新方法，即点过量溶质，用于量化空间分辨率有限的数据集中的溶质分离。这种新方法基于使用数据集采样方法测量基质浓度。我们表明，新方法可以准确地再现先验合成数据集的预期值，并且当数据集空间分辨率和/或相位对比度太低而无法准确量化时，这是可以观察到的。然后将该方法应用于 Al-Mg-Si-Cu 系统中自然老化的溶质团簇。数据集的自然老化时间范围为 8 分钟到 76 周。结果表明，溶质簇的形成不受合金中铜含量的影响。
Accurate, repeatable and quantitative analysis of nanoscale solute clustering in atom probe tomography (APT) datasets is a complex challenge which is made more difficult by the positional uncertainty and lack of absolute resolution inherent to the technique. In this work a new method, the point excess solute, is introduced for quantifying solute segregation in datasets with limited spatial resolution. This new method is based on measuring the matrix concentration using a dataset sampling method. We show the new method can accurately reproduce the values expected from synthetic datasets a priori and when the dataset spatial resolution and or phase contrast is too low for accurate quantification this is observable. The method is then applied to naturally aged solute clusters in the Al-Mg-Si-Cu system. Datasets were collected with a range of natural ageing times from 8 min to 76 weeks. The formation of the solute clusters is shown to be unaffected by the Cu content of the alloy.