Characterization of the effects of 3-MeV proton irradiation on fine-grained isotropic nuclear graphite
Characterization of the effects of 3-MeV proton irradiation on fine-grained isotropic nuclear graphite
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DOI：
10.1016/j.carbon.2014.05.034
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发表时间：
2014-10
期刊：
影响因子：
10.9
通讯作者：
Baoliang Zhang;H. Xia;Xiu-Jie He;Zhoutong He;Xiangdong Liu;Mingwen Zhao;Xingtai Zhou
中科院分区：
文献类型：
--
作者：
Baoliang Zhang;H. Xia;Xiu-Jie He;Zhoutong He;Xiangdong Liu;Mingwen Zhao;Xingtai Zhou
采用3-MeV质子辐照，研究了室温下IG-110核石墨的辐照损伤。采用扫描电镜、透射电镜（TEM）、拉曼光谱（Raman spectroscopy）、x射线衍射（XRD）和纳米压痕等方法对辐照效果进行了表征。辐照后石墨表面形貌呈碎片状，表明石墨表面微观结构受到质子轰击破坏。TEM图像显示缺陷团簇（可能是间隙团簇）、基面弯曲和基面位错的增加，这可能是导致性能变化的主要原因。拉曼研究表明，间隙缺陷和空位缺陷迅速增加，面内“晶粒尺寸”减小。XRD结果表明，层间距略有增大，晶粒尺寸略有减小。硬度和模量的提高可归因于质子辐照产生的晶格缺陷对基面位错的钉住作用。
The irradiation-induced damage on the fine-grained isotropic nuclear graphite, IG-110, was investigated by 3-MeV proton irradiation at room temperature. The irradiation effects were characterized using scanning electron microscopy, transmission electron microscopy (TEM), Raman spectroscopy, X-ray diffraction (XRD), and nano-indentation. The surface morphology showed a fragmented shape after irradiation, indicating that the surface microstructure of the graphite was damaged by proton bombardment. The TEM images revealed clear and convincing evidence for the increase in defect clusters (probably interstitial clusters), basal plane bending, and basal plane dislocations, which might be the main reason for property changes. Raman studies indicated a rapid increase in the interstitial and vacancy defects, and decrease of in-plane “crystallite size”. The XRD results indicated a slight increase in the interlayer spacing and decrease in crystallite size. The enhancement in the hardness and modulus can be attributed to the pinning of basal plane dislocations by lattice defects produced by proton irradiation.