Decoration of Voids with Rhenium and Osmium Transmutation Products in Neutron Irradiated Single Crystal Tungsten

M. J. Lloyd, R. Abernethy, I. Griffiths, P. Bagot, M. Moody, D. Armstrong, M. Gilbert
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引用次数: 38

Abstract

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.
中子辐照单晶钨中铼锇嬗变产物对空洞的修饰
摘要高温、中子辐照单晶钨,辐照后成分为W - 1.20 ± 0.11 at。%Re - 0.11 ± 0.05 at。%Os - 0.03 ± 0.01 at。%Ta采用原子探针断层扫描(APT)和扫描透射电镜(STEM)相结合的方法进行表征。APT表明,在纳米级Re/Os簇内,原子密度高于理论极限。互补高角环形暗场(HAADF)成像显示,一些星团在其中心含有空洞,这导致APT像差和提高原子密度。高分辨率能量色散x射线(EDX)光谱显示,空腔被铼壳装饰,其中一侧有一个小的锇团簇。
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