Microstructure and properties of submicron-scale TiC particle reinforced titanium matrix composites prepared by shock wave consolidation

摘要

Submicron-scale TiC particle reinforced titanium matrix composites (TMCs) were prepared by shock wave consolidation technique at detonation speed of 2 500 - 5 000 m/s. The microstructures were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The compressive strength and hardness values of the composites were also determined. The results show that the composites have higher compressive yield strength and hardness values than hot-rolled pure titanium. Twins in the microstructure of TMCs show that titanium particles undergo plastic deformation during consolidation process. The fine grains with size less than 1 mum often locate in the boundaries among the titanium particles. TiC particles seem to keep unchanged during the consolidation. These bring about the increase in strength and hardness for the composites. The detonation speed of 3200 m/ s is proper parameter for compacting powder in the present work.