A Novel Heterogeneous Network Structure Titanium Matrix Composite with a Combination of Strength and Ductility

In this work, a heterogeneous network structure of boron (B) and graphene oxide (GOs) reinforced Ti6Al4V (Ti64) titanium matrix composite was designed. The results show that the heterogeneous network structure composites consist of fine grain zones with a network structure and coarse grain zones with good ductility. Furthermore, the heterogeneous network structure composite had higher strength and ductility than the homogeneous network structure composite. The strength increases since the reinforcement are distributed at the small size matrix interface, which gives full play to the grain boundary strengthening effect. TiB whiskers embedded in the matrix play a good load transfer effect to alleviate the loss of ductility. In addition, the good ductility can be attributed to the existence of a large size matrix and the connectivity between the Ti matrix. It can hinder crack propagation and play a role in bearing load. As a result, the designed heterogeneous network structure matrix composites were successfully prepared, but the strength and ductility of the composites were improved. This provides a new idea for the design of high-performance titanium matrix composites