使用原子探针断层扫描进行定量化学结构评估：Fe-Al的短程有序分析
Quantitative chemical-structure evaluation using atom probe tomography: Short-range order analysis of Fe-Al.
作者信息
Marceau R K W, Ceguerra A V, Breen A J, Raabe D, Ringer S P
机构信息
Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia; Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany.
Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia; School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia.
出版信息
Ultramicroscopy. 2015 Oct;157:12-20. doi: 10.1016/j.ultramic.2015.05.001. Epub 2015 May 5.
Short-range-order (SRO) has been quantitatively evaluated in an Fe-18Al (at%) alloy using atom probe tomography (APT) data and by calculation of the generalised multicomponent short-range order (GM-SRO) parameters, which have been determined by shell-based analysis of the three-dimensional atomic positions. The accuracy of this method with respect to limited detector efficiency and spatial resolution is tested against simulated D03 ordered data. Whilst there is minimal adverse effect from limited atom probe instrument detector efficiency, the combination of this with imperfect spatial resolution has the effect of making the data appear more randomised. The value of lattice rectification of the experimental APT data prior to GM-SRO analysis is demonstrated through improved information sensitivity.
利用原子探针断层扫描（APT）数据，并通过计算广义多组分短程有序（GM-SRO）参数，对Fe-18Al（原子百分比）合金中的短程有序（SRO）进行了定量评估，GM-SRO参数是通过对三维原子位置进行基于壳层的分析确定的。针对模拟的D03有序数据，测试了该方法在有限探测器效率和空间分辨率方面的准确性。虽然原子探针仪器探测器效率有限的负面影响最小，但这种情况与不完美的空间分辨率相结合，会使数据看起来更加随机。通过提高信息灵敏度，证明了在进行GM-SRO分析之前对实验APT数据进行晶格校正的价值。
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