Decoration of Voids with Rhenium and Osmium Transmutation Products in Neutron Irradiated Single Crystal Tungsten
Decoration of Voids with Rhenium and Osmium Transmutation Products in Neutron Irradiated Single Crystal Tungsten
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DOI：
10.2139/ssrn.3389518
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
M. J. Lloyd;R. Abernethy;I. Griffiths;P. Bagot;M. Moody;D. Armstrong;M. Gilbert
中科院分区：
文献类型：
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作者：
M. J. Lloyd;R. Abernethy;I. Griffiths;P. Bagot;M. Moody;D. Armstrong;M. Gilbert
高温中子辐照单晶钨，辐照后成分为W - 1.20 ± 0.11at.% Re - 0.11 ± 0.05 at.% Os - 0.03 ± 0.01 at.% Ta的特点是使用原子探针断层扫描（APT）和扫描透射电子显微镜（STEM）的组合。APT表明，在纳米尺度的Re/Os团簇内，原子密度高于理论极限。免费的高角度环形暗场（HAADF）成像显示，一些集群在其中心包含空洞，导致APT像差和提高原子密度。高分辨率的能量色散X射线（EDX）光谱显示，空隙被一个小的锇簇的一面装饰的贝壳。
Abstract High temperature, neutron irradiated single crystal tungsten, with a post irradiation composition of W - 1.20 ± 0.11 at.%Re - 0.11 ± 0.05 at.%Os - 0.03 ± 0.01 at.%Ta was characterised using a combination of Atom Probe Tomography (APT) and Scanning Transmission Electron Microscopy (STEM). APT showed that within nanoscale clusters of Re/Os, the atomic density was above the theoretical limit. Complimentary High Angle Annular Dark Field (HAADF) imaging shows that some clusters contain voids at their centre which are leading to APT aberrations and enhancing the atomic density. High resolution Energy Dispersive X-ray (EDX) spectroscopy shows that voids are decorated with a shell of rhenium with a small osmium cluster to one side.