TiC-Ti-Al-CNTs体系原位制备Ti_2AlC增强钛铝基复合材料

In Situ Ti-Al Matrix Composites Reinforced by Ti_2AlC Prepared in TiC-Ti-Al-CNTs System

利用TiC-Ti-Al-CNTs体系的原位热压技术制备Ti2AlC增强的钛铝基复合材料。借助XRD和SEM分析不同配方对应产物的相组成、显微结构及性能。结果表明,由于CNTs的掺杂消耗了Ti,导致形成的产物组成不同。对于Ti2AlC/TiAl基复合材料,Ti2AlC增强相呈颗粒状分布,Ti2AlC含量低时,综合性能较好;对于Ti2AlC/TiAl3基复合材料,由于形成了搭接层状结构,弯曲强度和断裂韧度分别为290.97MPa和5.08MPa·m1/2,较TiAl3合金分别提高了79.62%和154%。

Ti2AlC reinforced titanium aluminide composites were fabricated successfully by in situ hot pressing technique in TiC-Ti-Al-CNTs system. The phase composition, microstructure and mechanical properties of the composites prepared were investigated by XRD and SEM. The results show that CNTs can consume Ti element, which results in different phase composition in the products. For Ti2AlC/TiAl composites, Ti2AlC reinforcements exhibit particle morphology, and the composite with lower Ti2AlC content has better comprehensive properties. For Ti2AlC/TiAl3 composites, the structure presents overlap joint lamellar structure, and the flexural strength and fracture toughness reach 290.97 MPa and 5.08 MPa · m^1/2 , respectively, increased by 79.62% and by 154%, compared with those of the TiAl3 alloy.