The pores evolution in 3D view of nuclear graphite under ion beam irradiation
The pores evolution in 3D view of nuclear graphite under ion beam irradiation
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DOI：
10.1016/j.jnucmat.2021.153262
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发表时间：
2021-12
影响因子：
3.1
通讯作者：
Fanggang Liu;Zhoutong He;Yu Wang;Yongqi Zhu;B. Huang;A. Theodosiou;Andrew M. Smith;A. Jones
中科院分区：
文献类型：
--
作者：
Fanggang Liu;Zhoutong He;Yu Wang;Yongqi Zhu;B. Huang;A. Theodosiou;Andrew M. Smith;A. Jones
石墨作为一种优良的慢化剂和反射层材料，在核反应堆中得到了广泛的应用。辐照会改变石墨的孔结构和孔含量，这与石墨的性能密切相关。然而，核石墨对孔隙的辐照效应需要更深刻的理解，特别是在三维（3D）视图上的演变。在这项工作中，FIB-SEM断层扫描直观地揭示了离子辐照石墨等级IG 110的孔结构和孔隙率演变的3D视图，其在400 °C下用30 MeV Ni 5+离子辐照。孔隙率的定量统计表明，孔隙率与离子辐照损伤呈负相关，证实了离子沉积位置与辐照损伤峰值的一致性。此外，不同的离子辐照深度和原生石墨的单个微裂纹被提取和显示在各种3D透视图中，其表现出比透镜状结构复杂得多的形态，并展示了辐照下的微裂纹的闭合趋势。通过三维孔结构的显示和孔隙率的定量统计，旨在进一步了解核石墨的离子辐照行为。
As an outstanding material for moderator and reflector, graphite is broadly applied in nuclear reactors. Irradiation will change the pore structure and content, which is intimately related to the properties of graphite. However, the irradiation effect of nuclear graphite on pores requires a more profound understanding, especially the evolution on a three-dimensional(3D) view. In this work, FIB-SEM tomography intuitively reveal the pore structure and porosity evolution of ion irradiated graphite grades IG110 in a 3D view, which was irradiated with 30 MeV Ni5+ion at 400 °C. Besides, the quantitative statistic of porosity indicates a negative correlation between porosity with the ion irradiation damage and confirms the consistency of ion deposition sites and irradiation damage peak. Moreover, individual microcracks of the different ion irradiated depths and virgin graphite are extracted and displayed in various 3D perspectives, which exhibit a much more complex morphology than lenticular structure and demonstrates the closed trend of the microcracks under irradiation. Through the display of 3D pore structure and quantitative statistics of porosity, aims to provide a further understanding of ion irradiation behavior of nuclear graphite.