Abstract A Mg 6Zn composite reinforced by novel urchin-like hybrid reinforcement of carbon nanotubes and silicon carbide (CNTs@SiCp) was fabricated via semisolid stirring assisted with ultrasonic vibration method and exhibits remarkable strengthening effect. Carbon nanotubes (CNTs) were in-situ and dispersed uniformly in the matrix with the assistance of silicon carbide particle (SiCp) as “vehicle”. A series of synthesis parameters were optimized to produce high-quality CNTs. The graphitization degree and the yield of CNT were evaluated by Raman spectra and Thermogravimetric analysis (TGA), respectively. Compared with mono-SiCp reinforced Mg 6Zn composite (SiCp/Mg-6Zn), the CNTs@SiCp reinforced Mg 6Zn composite with urchin-like reinforcement (CNTs@SiCp/Mg-6Zn) enhanced the yield strength, ultimate tensile strength and elongation by 14%, 20% and 18.2% respectively. Digital image correlation (DIC) investigation indicates that the CNTs enhanced the interface bonding between SiCp and the Mg matrix. A SiC-(CNT-Mg)-Mg interface layer was formed between the SiCp and Mg matrix, which could relieve the interface stress concentration and impede microcrack propagation in the matrix under applied load. This work highlights the strengthening and toughening effects of the urchin-like CNTs@SiCp reinforcement and provides a new approach to fabricate hybrid composites.

中文翻译：

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Urchin-like CNTs@SiCp增强的新型镁基复合材料的加工、微观结构和机械性能

摘要 采用超声振动法辅助半固态搅拌制备了一种新型海胆状碳纳米管和碳化硅混合增强材料（CNTs@SiCp）增强的Mg 6Zn复合材料，具有显着的增强效果。碳纳米管（CNT）在碳化硅颗粒（SiCp）的帮助下原位均匀分散在基体中作为“载体”。优化了一系列合成参数以生产高质量的碳纳米管。分别通过拉曼光谱和热重分析(TGA)评价石墨化程度和CNT的产率。与单 SiCp 增强的 Mg 6Zn 复合材料（SiCp/Mg-6Zn）相比，具有海胆状增强的 CNTs@SiCp 增强的 Mg 6Zn 复合材料（CNTs@SiCp/Mg-6Zn）通过以下方式提高了屈服强度、极限拉伸强度和伸长率： 14%、20% 和 18。分别为 2%。数字图像相关 (DIC) 研究表明 CNT 增强了 SiCp 和 Mg 基体之间的界面结合。在SiCp与Mg基体之间形成了SiC-(CNT-Mg)-Mg界面层，可以缓解界面应力集中，阻止微裂纹在外加载荷作用下在基体中的扩展。这项工作突出了类似海胆的 CNTs@SiCp 增强材料的强化和增韧作用，并提供了一种制造混合复合材料的新方法。在外加载荷作用下，可以缓解界面应力集中，阻止微裂纹在基体中的传播。这项工作突出了类似海胆的 CNTs@SiCp 增强材料的强化和增韧作用，并提供了一种制造混合复合材料的新方法。在外加载荷作用下，可以缓解界面应力集中，阻止微裂纹在基体中的传播。这项工作突出了类似海胆的 CNTs@SiCp 增强材料的强化和增韧作用，并提供了一种制造混合复合材料的新方法。