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Position artifacts in 3D reconstruction of plate-shaped precipitates in steels depending on the analysis direction of atom probe tomography
Surface and Interface Analysis ( IF 1.7 ) Pub Date : 2021-08-09 , DOI: 10.1002/sia.7001
Jun Takahashi 1 , Kazuto Kawakami 2
Affiliation  

Atom probe tomography (APT) analysis often produces artifacts in atomic position owing to the difference in evaporation fields in materials. The atomic density profiles of grain boundaries, plate-shaped low-field precipitates (cementite), and high-field precipitates (vanadium carbide) in steels were investigated via two analyses in directions perpendicular and parallel to the boundaries and platelets. Although the perpendicular analysis indicated better quantitative performances in the composition analyses of segregating atoms at the grain boundary and the constituent atoms of the precipitates, an abnormal atomic density was observed around the interfaces of the precipitates. Geometric calculation using a two-radius model based on the local magnification effect suggested that a spike structure at the front interface and a dip structure at the rear interface for lamellar cementite correspond to an overlap and a gap in the evaporated atoms from the cementite and matrix, respectively. This indicates that even in the perpendicular analysis, the precipitate constituent atoms and matrix atoms mixed in the depth direction. We discuss the origin and impact of the position artifacts in the perpendicular analyses of low- and high-field plate-shaped precipitates and also discussed the application limits of the model.

中文翻译:

取决于原子探针断层扫描分析方向的钢中板状析出物 3D 重建中的位置伪影

由于材料蒸发场的差异,原子探针断层扫描 (APT) 分析通常会在原子位置产生伪影。通过在垂直和平行于晶界和片晶的方向上的两种分析,研究了钢中晶界、板状低场析出物(渗碳体)和高场析出物(碳化钒)的原子密度分布。虽然垂直分析表明在晶界偏析原子和析出物组成原子的成分分析中具有更好的定量性能,但在析出物界面周围观察到异常的原子密度。基于局部放大效应的双半径模型几何计算表明,层状渗碳体前界面的尖峰结构和后界面的倾斜结构对应于渗碳体和基体蒸发原子的重叠和间隙, 分别。这表明即使在垂直分析中,析出成分原子和基体原子在深度方向上也混合。我们讨论了低场和高场板状沉淀物垂直分析中位置伪影的起源和影响,并讨论了模型的应用限制。析出成分原子和基体原子在深度方向混合。我们讨论了低场和高场板状沉淀物垂直分析中位置伪影的起源和影响,并讨论了模型的应用限制。析出成分原子和基体原子在深度方向混合。我们讨论了低场和高场板状沉淀物垂直分析中位置伪影的起源和影响,并讨论了模型的应用限制。
更新日期:2021-10-06
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