Atom‐probe tomography and transmission electron microscopy of the kamacite–taenite interface in the fast‐cooled Bristol IVA iron meteorite
Atom‐probe tomography and transmission electron microscopy of the kamacite–taenite interface in the fast‐cooled Bristol IVA iron meteorite
复制标题
快速冷却的布里斯托尔 IVA 铁陨石中的铁纹石-银纹石界面的原子探针断层扫描和透射电子显微镜
DOI：
10.1111/maps.12988
复制
发表时间：
2017
影响因子：
2.2
通讯作者：
D. Seidman
中科院分区：
文献类型：
--
作者：
S. Rout;P. Heck;D. Isheim;T. Stephan;N. Zaluzec;Dean J. Miller;A. Davis;D. Seidman
我们报告了第一个结合原子探针断层扫描（APT）和透射电子显微镜（TEM）研究的铁陨石布里斯托尔（IVA）内的斜纹石-四纹石（K-T）界面区域。使用聚焦离子束扫描电子显微镜 (FIB-SEM) 从 K-T 界面制备了 10 个 APT 纳米尖端，然后使用 TEM 和 APT 进行研究。在 K-T 界面附近，我们在斜纹石中发现了 3.8 ± 0.5 wt% Ni，在辉长岩中发现了 53.4 ± 0.5 wt% Ni。浑浊区 (CZ) 的高镍沉淀区域含有 50.4 ± 0.8 wt% Ni。 CZ 和马氏体界面附近的区域具有 <10 nm 尺寸的富镍沉淀物，其中 38.4 ± 0.7 wt% Ni 存在于具有 25.5 ± 0.6 wt% Ni 的低 Ni 基体中。我们发现 Cu 主要富集在辉铜矿中，而 Co、P 和 Cr 则富集在斜纹石中。磷优先沿 K-T 界面富集。这项研究是首次以高空间分辨率和 3D 方式精确测量 IVA 铁陨石 K-T 界面区域的相组成，进一步加深了我们对 400 °C 以下快冷铁陨石中相组成变化的了解。我们证明，APT 与 TEM 结合是研究快速冷却铁陨石中纳米级特征的主要、次要和痕量元素组成的有用方法。
We report the first combined atom‐probe tomography (APT) and transmission electron microscopy (TEM) study of a kamacite–tetrataenite (K–T) interface region within an iron meteorite, Bristol (IVA). Ten APT nanotips were prepared from the K–T interface with focused ion beam scanning electron microscopy (FIB‐SEM) and then studied using TEM followed by APT. Near the K‐T interface, we found 3.8 ± 0.5 wt% Ni in kamacite and 53.4 ± 0.5 wt% Ni in tetrataenite. High‐Ni precipitate regions of the cloudy zone (CZ) have 50.4 ± 0.8 wt% Ni. A region near the CZ and martensite interface has <10 nm sized Ni‐rich precipitates with 38.4 ± 0.7 wt% Ni present within a low‐Ni matrix having 25.5 ± 0.6 wt% Ni. We found that Cu is predominantly concentrated in tetrataenite, whereas Co, P, and Cr are concentrated in kamacite. Phosphorus is preferentially concentrated along the K‐T interface. This study is the first precise measurement of the phase composition at high spatial resolution and in 3‐D of the K‐T interface region in a IVA iron meteorite and furthers our knowledge of the phase composition changes in a fast‐cooled iron meteorite below 400 °C. We demonstrate that APT in conjunction with TEM is a useful approach to study the major, minor, and trace elemental composition of nanoscale features within fast‐cooled iron meteorites.
透射电子显微镜
DOI：
10.1007/978-3-319-26651-0_3
发表时间：
2016
期刊：
--
影响因子：
--
作者：
Burke M
通讯作者：
Burke M