Microstructure and mechanical properties of Ti2AlC-reinforced TiAl composites

作者：Ai Taotao^*; Liu Fang; Yu Qi; Feng Xiaoming; Zhang Yingtang; Li Wenhu

来源：International Journal of Materials Research, 2014, 105(11): 1118-1122.

DOI：10.3139/146.111119

• Composites
• Carbide
• Microstructure
• Mechanical properties

Ti2AlC/TiAl composites were successfully in-situ synthesized by reaction hot pressing using Ti, Al, TiC and CNTs as starting materials. The results indicate that the as-sintered composites mainly consist of Ti2AlC and TiAl phases. The mechanical properties of the 23 wt.% Ti2AlC/TiAl composite exhibit the highest values, with a flexural strength and fracture toughness of 652.5 +/- 76.8 MPa and 6.6 +/- 0.5 MPa m(1/2), respectively. The complex structure coupled with dispersed Ti2AlC micro-particulates is responsible for the enhancement in the strength. Toughening of the composite is mainly attributed to crack deflection, crack bridging, crack branching and pull-out of the Ti2AlC particles, as well as transgranular cracking.

• 出版日期2014-11
• 单位陕西理工大学