Sub-nanometre elemental analysis of Cu cluster in Fe-Cu-Ni alloy using aberration corrected STEM-EDS
Sub-nanometre elemental analysis of Cu cluster in Fe-Cu-Ni alloy using aberration corrected STEM-EDS
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DOI：
10.1111/j.1365-2818.2010.03438.x
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发表时间：
2011-04-01
影响因子：
2
通讯作者：
Sato, K.
中科院分区：
文献类型：
--
作者：
Nakamichi, H.;Yamada, K.;Sato, K.
为了了解Cu簇化的机理和Ni对Cu簇化的影响，利用扫描透射电镜对含Cu钢进行了亚纳米尺度的结构和元素分析。在通过改变电子散射角调整系统观测条件的基础上，我们采用50 ~ 70 mrad的内散射半角进行扫描透射电子显微镜能量色散x射线能谱分析。在此条件下，通过原子尺度扫描透射电子显微镜环形暗场图像可以清晰地识别出9R等Cu析出物。在向9R转变之前，在位错上发现了Cu团簇，并具有周期性的应变场。在Cu团簇附近也观察到Ni富集。考虑Cu和Ni的富集现象，发现Cu通过位错快速扩散，同时Ni通过Cu团簇喷射富集，形成壳状结构。
P>In order to understand the mechanism of Cu clustering and Ni effects on Cu clusters, a sub-nano scale structural and elemental analysis of Cu-bearing steels was carried out through an aberration corrected scanning transmission electron microscope. Based on systematic observation condition adjustment by changing the electron scattered angle, we adopted an inner scattered semi angle of between 50 and 70 mrad for the scanning transmission electron microscope energy dispersive X-ray spectroscopy analysis. Under this condition, Cu precipitates such as 9R are clearly recognized through atomic scale scanning transmission electron microscope annular dark field images. Cu clusters, before transforming to 9R, are detected on the dislocation and have a periodical strain field. Ni enrichment is also observed in the vicinity of Cu clusters. Considering these enrichment phenomena of Cu and Ni, it is found that Cu diffuses rapidly through dislocation, while at the same time, Ni enrichment occurs by ejection from Cu clusters and forms a shell structure.