Effects of volume fractions on the microstructure and mechanical properties of TiB_w/Ti composites

In this paper, in order to further increase the reinforcement strengthening effect, on the basis of titanium matrix composites with a novel network microstructure, 10 vol.%, 12 vol.%, 15 vol.%, 17 vol.%TiB_w/Ti composites with a tailored microstructure were successfully fabricated by decreasing Ti powder size and increasing milling energy, which can enhance the special surface of Ti powder and then the optimal reinforcement fraction. Additionally, the effects of volume fractions on the microstructure and mechanical properties of TiB_w/Ti composites have been analysed. The experimental results showed that TiB_w-rich region and TiB_w-lean region are still observed in the present composites. Compare with that of pure Ti, the tensile strength of 10 vol.%TiB_w composites is increased to 846 MPa, or increased by 106.8%.The tensile elongation is 3.7%. When the reinforcement volume fraction is increased to 12%, the tensile strength is enhanced to 970 MPa. Moreover, with inreaseing the volume fraction of TiB_w reinforcement, the compressive yield strength is increased by more than 8 times at high temparature. These phenomena exhibit a superior strengthening effect of the present composites.