受贝壳微纳米层状结构具有强度与韧性最佳匹配启发，本项目创新性地采用电泳沉积方法构建碳纳米管（CNTs）强化层，结合放电等离子烧结与轧制变形实现CNTs/Ti复合材料仿生层状结构的构建与调控，利用其优异的结构效应，解决钛基复合材料强度-韧性（塑性）倒置问题。优化制备参数，开发出CNTs/Ti复合材料的新型制备方法，突破CNTs均匀分散与CNTs/Ti界面控制等关键问题，揭示仿生层状结构形成机理。建立“制备参数-层状结构-宏观力学性能”的关系，揭示层状结构与力学性能调控规律。结合原位加载与数字图像关联技术研究层状结构参数对宏观变形特性、局域应变分布和微观组织演化的影响规律，阐明仿生层状CNTs/Ti复合材料塑性变形的微观机制，揭示其结构效应。利用X射线断层扫描技术原位研究其断裂特性。基于以上分析，揭示仿生层状CNTs/Ti复合材料的断裂与强韧化机制，为实现钛基复合材料强韧化提供理论与试验依据。

Inspired by the optimal combination of strength and toughness of shell nacre which is caused by the elaborate hierarchical micro/nano structure, in this project it is innovatively proposed that carbon nanotubes (CNTs) reinforced layers are built by means of electrophoretic deposition technique. And low temperature spark plasma sintering (SPS) and rolling deformation are subsequently employed to fabricate and regulate the biomimetic laminated structure of CNTs/Ti composites. Based on their perfect structure effect, the inverse relationship between strength and toughness (plasticity) of titanium matrix composites (TMCs) is likely to be solved. Firstly, the key problems of TMCs including the nonuniform dispersion of CNTs in titanium matrix and the interfacial reaction between CNTs and Ti will be solved by optimizing the fabrication parameters and thus a feasible fabrication method for biomimetic laminated CNTs/Ti composites is successfully exploited. In addition, the formation mechanism of biomimetic laminated structure will be clarified. Secondly, the relationship among fabrication parameters, laminated structure and mechanical properties will be established and the regulation mechanism of laminated structure and mechanical properties will be revealed. Thirdly, in situ scan electron microscope tensile experiment and digital image correlation (DIC) technique are combined to investigate the effect of laminated structure parameters on macroscopic deformation reductions, local strain distribution and deformed microstructure in order to illuminate the plastic deformation mechanism of biomimetic laminated CNTs/Ti composites. Hence, the unique structure effect will be revealed. Moreover, the fracture characteristic will be characterized by X-ray tomography technique. Finally, strengthening-toughening mechanism of the novel biomimetic laminated CNTs/Ti composites will be proposed. The finding of this project will provide a theoretic guide and experimental basis for realizing the optimal combination of strength and toughness (plasticity) of TMCs.