多孔 SiC/Ti 非晶合金复合材料的动态压痕响应行为

摘要

多孔 SiC/Ti 基非晶合金复合材料作为一种新型的复合材料，在轻质装甲领域具有重要的应用前景。通过对比研究该复合材料在静态和动态加载下的硬度和相应的压痕变形特征，揭示该复合材料的动态响应行为，评估其冲击性能，其中动态硬度采用自主设计的基于分离式霍普金森压杆(SHPB)的改进装置进行测试。研究发现复合材料的动态硬度明显高于静态硬度，其动态脆性参数也明显高于静态脆性参数。该复合材料在静态和动态加载下的变形和断裂特征并无显著差别，均表现为 SiC 相中形成了大量的裂纹而非晶相发生了剧烈的塑性变形，所不同的仅是动态压痕加载下的变形行为比静态更剧烈。%Porous SiC/Ti-based metallic glass composite (Ti-BMGC), a new kind of composite, has significant application prospect in the field of light armor. To evaluate the dynamic mechanical response of the composite, dynamic Vickers hardness and indentation-induced deformation behavior were investigated by comparison with that under static indentation. The dynamic hardness was measured by a modified split Hopkinson pressure bar (SHPB). The dynamic hardness is obviously greater than the static hardness. The brittleness parameter under dynamic indentation is also greater than that under static indentation. Although the dynamic indentation induced more severe deformation behavior than the static indentation, the deformation and fracture characteristics in the two loading cases are nearly the same, both exhibiting extensive cracks in the SiC phase and severe plastic deformation in the metallic glass phase.