Ti含量对CNT/Al复合材料组织与性能的影响

通过高能球磨、放电等离子烧结和热挤压的方法，制备了不同钛含量的(CNT-Ti)/Al复合材料，并探究了高能球磨对粉末形貌演变、烧结以及热挤压对体复合材料的组织结构与力学性能的影响。结果表明：钛的加入不仅能分散部分碳纳米管(carbon nanotubes, CNTs)，还能与Al基体反应形成分布均匀的第二增强相TiAl3，且TiAl3的含量与加入钛的含量成正比。Ti含量越高，(CNT-Ti)/Al棒材显微硬度越高，塑性和韧性随之降低。含钛量为7 %的复合材料具有最高的拉伸强度（221 MPa），这主要归因于在制备过程中生成的第二相TiAl3比例适中，能较好地发挥其弥散强化的增强效应。

Effect of Ti addition on the structure and mechanical properties of CNT/Al composites

This work fabricated (CNT-Ti)/Al composites by high energy ball milling, spark plasma sintering and hot extrusion. The effect of Ti addition on the evolution of microstructure and mechanical properties of (CNT-Ti)/Al composites was investigated. It shows that addition of Ti can disperse part of CNTs and react with Al matrix to form a second reinforced phase TiAl3 with uniform distribution, and the TiAl3 content is directly proportional to Ti addition. The higher the Ti content, the higher the microhardness and the lower the plasticity and toughness of (CNT-Ti)/Al composite. The composite with 7 % Ti has the highest tensile strength (221 MPa), which is due to the moderate formation of the second phase TiAl3 during fabrication and their dispersion strengthening effect.