基于微聚焦X射线散射/Raman联用的γ辐照碳纤维力学性能演变机制研究

被誉为“未来梦幻材料”的碳纤维实际强度仅为理论值的5%。γ射线辐照可以显著增强碳纤维力学性能，但其机制仍不明确。本项目拟首先构建针对γ辐照碳纤维异质结构演化分析的多层次分区精细模型，再采用微聚焦同步辐射与非同步辐射μ-SAXS/μ-WAXS/Raman联用技术对γ辐照碳纤维异质微区的微孔缺陷、微晶结构以及原子结构进行精准、同步靶向表征；研究辐射、化学及温度等外场作用对碳纤维不同微区多尺度结构及力学性能的影响规律，建立γ辐照碳纤维各微区原子结构、微晶结构、微孔缺陷尺寸和分布与力学性能之间的多参数耦合关系；从“原子结构演化→微晶和微孔结构演变→力学性能增强”的角度揭示γ辐照对碳纤维力学强化的作用机制。项目将为碳纤维γ辐照调控提供理论依据，对于深化高能量、瞬时强场辐射与碳材料相互作用机理的认知，促进多尺度、高空间分辨同步辐射与非同步辐射联用技术在纤维结构研究领域的应用具有重要理论价值和现实意义。

Carbon fibers are known as the dream material of the future, and the actual strength of carbon fibers is only 5% of the theoretical value. The mechanical properties of carbon fibers can be significantly enhanced by gamma-ray irradiation, but its mechanism is still unclear. This project intends to firstly build a multi-level and segmented fine model for the analysis of the mechanical strengthening mechanism of irradiated carbon fibers, and then use the combined technology of micro-focused synchrotron radiation and non-synchrotron radiation μ-SAXS/μ-WAXS/Raman to accurately and synchronously characterize the microporous defects, microcrystalline structures and atomic structures in the heterogeneous microregions of irradiated carbon fibers. The effects of radiation, chemistry and temperature conditions on the multi-scale structure and mechanical properties of carbon fibers would be investigated. From the angle of atomic structure evolution, microcrystalline and microporous structure evolution and mechanical properties enhancement, the mechanism of carbon fiber mechanical strengthening by irradiation is expected to be revealed. The project will provide theoretical basis for the radiation regulation of carbon fibers, and have important theoretical value and practical significance for deepening the understanding of the interaction between high-energy, instantaneous strong field radiation and carbon materials, and promoting the application of multi-scale, high spatial resolution synchrotron radiation and non-synchrotron radiation in the research field of fiber structure.