Nano-cracks in a synthetic graphite composite for nuclear applications
Nano-cracks in a synthetic graphite composite for nuclear applications
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用于核应用的合成石墨复合材料中的纳米裂纹
DOI：
10.1080/14786435.2018.1433886
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发表时间：
2018
影响因子：
1.6
通讯作者：
Liu D
中科院分区：
文献类型：
--
作者：
Liu D
用透射电镜和选区衍射研究了有核石墨中的Mrozowski纳米裂纹。该材料由通常1-2 nm厚的单晶片晶组成，并围绕轴以较大的相对旋转堆叠;单个片晶具有六边形和立方堆积顺序。（0002）平面的晶格间距在小片边界处大约3%，这是高分数纳米裂纹的来源。倾斜实验表明，这些裂缝是空的，而不是像人们通常认为的那样，由非晶材料填充。除了传统的Mrozowski裂纹，一种新型的纳米裂纹的报告，这源于终止的石墨片晶由于晶体学的要求。这两种类型是至关重要的理解与中子辐照的宏观尺度石墨性能的演变。
Mrozowski nano-cracks in nuclear graphite were studied by transmission electron microscopy and selected area diffraction. The material consisted of single crystal platelets typically 1–2 nm thick and stacked with large relative rotations around thec-axis; individual platelets had both hexagonal and cubic stacking order. The lattice spacing of the (0002) planes was about 3% larger at the platelet boundaries which were the source of a high fraction of the nano-cracks. Tilting experiments demonstrated that these cracks were empty, and not, as often suggested, filled by amorphous material. In addition to conventional Mrozowski cracks, a new type of nano-crack is reported, which originates from the termination of a graphite platelet due to crystallographic requirements. Both types are crucial to understanding the evolution of macro-scale graphite properties with neutron irradiation.
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