Proton and gamma irradiation of novel tungsten boride and carbide candidate shielding materials
Proton and gamma irradiation of novel tungsten boride and carbide candidate shielding materials
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DOI：
10.1016/j.fusengdes.2023.113667
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发表时间：
2023-03-23
影响因子：
1.7
通讯作者：
Marshall, J. M.
中科院分区：
文献类型：
--
作者：
Marshall, J. M.
低活化cWC和RSBs显示出相当大的前景，作为适用于紧凑型球形托卡马克（CST）的广谱辐射密集材料。首次研究了新型辐射致密材料硬质合金（cWC）和反应烧结硼化物（RSBs）在室温和非室温下的辐射响应，样品辐照包括408 K和873 K的1.5MeV质子和293 K和77 K的60Co γ辐照。通过电子背散射衍射（EBSD）和TEM观察到，cWC具有更大的辐射衰减比RSBs，但RSBs有更多的扩散位错分布的辐射诱导损伤的评价。观察到辐照温度对位错存在有显着影响，在873 K时RSBs中存在更弥散的位错，但在cWC中存在明确的损伤前沿，如通过EBSD中的带衬度和索引的变化以及TEM中的位错存在所确定的。观察到位错的存在是显著的相位依赖性的，特别是对于cWC，其中WC相用于吸收大部分辐射诱导的位错。这两个cWC和RSBs表现出显着的伽马射线衰减在77 K与大多数辐射引起的变化局限于从入射面的顶部25 μ m。
Low-activation cWC and RSBs show considerable promise as broad-spectrum radiation-dense materials suitable for use in compact spherical tokamaks (cSTs). The radiation response of novel radiation dense materials cemented tungsten carbide (cWC) and reactive sintered borides (RSBs) at ambient and non-ambient temperatures is investigated for the first time in this work.Sample irradiation consisted of 1.5 MeV protons at 408 K and at 873 K and 60Co gamma irradiation at 293 K and 77 K. Evaluation of radiation-induced damage via electron backscatter diffraction (EBSD) and TEM observed that cWCs have greater radiation attenuation than RSBs but RSBs have more diffuse dislocation distributions. Temperature at irradiation was observed to have a significant impact on dislocation presence with more diffuse dislocation presence in RSBs at 873K but with a well-defined damage front in cWCs as determined by changes in band contrast and indexing in EBSD and by dislocation presence in TEM. Dislocation presence observed to be significantly phase-dependant, particularly for cWC where the WC phase acts to absorb the bulk of radiation -induced dislocations. Both cWC and RSBs demonstrated significant gamma-ray attenuation at 77 K with most radiation-induced changes confined to the top 25 mu m from the incident face.