Abstract Nacre, a biomimetic model system with multiscale architectures and adjustable components, has always inspired researchers to create novel materials with advantages such as light-weight, exceptional strength and toughness. Inspired by nature, nacre-like bionic Ti2AlC/TiAl–Ti6Al4V laminated composite sheets had been designed and fabricated by spark plasma sintering technology using commercial Ti6Al4V as the toughening layers and Ti–Al–TiC reaction system as the composite layers. The phase compositions and structural characteristics of the composite sheets were characterized by XRD, SEM and EDS. In addition, the mechanical properties at room temperature were also measured. The results indicated that a Ti3Al interfacial layer was formed between the composite layer and the toughening layer, meanwhile the compositions of the composite layer were composed of TiAl, Ti3Al, Ti2AlC and a small amount of TiC. It's noteworthy that the Ti2AlC/TiAl–Ti6Al4V laminated composite sheets showed a significant increase in toughness while maintaining or improving strength even with holes in the sheets, in comparison with monolithic TiAl. When the loading direction was perpendicular to the laminated structure, the flexural strength and fracture toughness of the composite sheet with 20 wt% Ti2AlC reached good comprehensive values, which were up to 564.86 MPa and 39.15 MPa m1/2, respectively. The particles-reinforced composite layers and laminated structure design not only affected the crack propagation, but also cooperated with each other leading to a complex deflection and expansion behavior, which consumed the fracture energy and improved the overall mechanical properties of the composite sheets.

中文翻译：

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受自然启发的类珍珠层 Ti6Al4V-(Ti2AlC/TiAl) 层压复合材料结合了适当的强度和韧性以及协同效应

摘要 珍珠层是一种具有多尺度结构和可调组件的仿生模型系统，一直激励着研究人员创造具有重量轻、强度和韧性等优点的新型材料。受自然界的启发，采用放电等离子烧结技术，以商用 Ti6Al4V 为韧化层，Ti-Al-TiC 反应体系为复合层，设计并制造了类珍珠层仿生 Ti2AlC/TiAl-Ti6Al4V 层压复合板。通过XRD、SEM和EDS对复合片材的相组成和结构特征进行了表征。此外，还测量了室温下的机械性能。结果表明，复合层与增韧层之间形成了Ti3Al界面层，同时复合层的成分为TiAl、Ti3Al、Ti2AlC和少量TiC。值得注意的是，与整体式 TiAl 相比，Ti2AlC/TiAl-Ti6Al4V 层压复合板显示出韧性的显着增加，同时即使在板中有孔时也能保持或提高强度。当加载方向垂直于层状结构时，含20 wt% Ti2AlC的复合片材的抗弯强度和断裂韧性达到了良好的综合值，分别达到564.86 MPa和39.15 MPa m1/2。颗粒增强复合材料层和层状结构设计不仅影响裂纹扩展，而且相互配合导致复杂的挠度和膨胀行为，