A novel heterogeneous network structure titanium matrix composite with a combination of strength and ductility

Boron (B) and graphene oxide nanoplates (GOs) reinforced Ti6Al4V (Ti64) titanium matrix composite ((B + GOs)/Ti64) with a heterogeneous network structure was prepared via spark plasma sintering (SPS). 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. Compared with Ti64 alloy, heterogeneous network structure (B + GOs)/Ti64 composites has higher strength and ductility, both of which are superior to homogeneous network structure (B + GOs)/Ti64composite. The increase in strength is attributed to the grain refinement effect within the fine grain zone and the load transfer effect of the reinforcement at the interface. The ductility is mainly dependent on the existence of large size matrix and the improvement of deformation coordination and cracks propagation by the heterogeneous network structure. Finally, the conflict between the strength and plasticity of the composites is effectively reconciled. This provides a new idea for the design of high-performance titanium matrix composites.