Optimisation of mass ranging for atom probe microanalysis and application to the corrosion processes in Zr alloys
Optimisation of mass ranging for atom probe microanalysis and application to the corrosion processes in Zr alloys
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DOI：
10.1016/j.ultramic.2010.11.007
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发表时间：
2011-05-01
期刊：
影响因子：
2.2
通讯作者：
Gault, B.
中科院分区：
文献类型：
--
作者：
Hudson, D.;Smith, G. D. W.;Gault, B.
原子探针层析成像使用飞行时间质谱法从原子的质荷比来识别原子的化学性质。在质谱内，定义范围以便将化学特性归属于每个峰。原子探针微量分析的准确性依赖于这些范围的定义。在这里，我们提出并比较了几种自动测距技术，对模拟质谱测试。这些指标的性能比较有利的用户要求手动范围简化的模拟数据集的试验。然后使用优化的自动化测距程序精确评估锆合金中非常低的铁浓度（0.003-0.018 at%），以揭示其在腐蚀过程中在基质中的行为;将氧气注入溶液中，并具有增加氧化物-金属界面附近局部铁浓度的效果，这反过来又影响金属基材的腐蚀性能。(C)2010 Elsevier B. V.保留所有权利。
Atom probe tomography uses time-of-flight mass spectrometry to identify the chemical nature of atoms from their mass-to-charge-state ratios. Within a mass spectrum, ranges are defined so as to attribute a chemical identity to each peak. The accuracy of atom probe microanalysis relies on the definition of these ranges. Here we propose and compare several automated ranging techniques, tested against simulated mass spectra. The performance of these metrics compare favourably with a trial of users asked to manually range a simplified simulated dataset. The optimised automated ranging procedure was then used to precisely evaluate the very low iron concentration (0.003-0.018 at%) in a zirconium alloy to reveal its behaviour in the matrix during corrosion; oxygen is injected into solution and has the effect of increasing the local iron concentration near the oxide-metal interface, which in turn affects the corrosion properties of the metal substrate. (C) 2010 Elsevier B.V. All rights reserved.