Experimental study on dynamic mechanical properties of TiB-whisker-reinforced Ti-6Al-4V Alloy

In this study, the titanium matrix composites (TMCs) reinforced by TiB whiskers (TiBw) were fabricated by spark plasma sintering (SPS) technique. The dynamic compression test was carried out to study the effect of TiBw content on dynamic mechanical properties of TiBw/TMCs. Results showed that the TiBw content (0.76vol%∼6.84vol%) correspond to specific microstructure which affect the dynamic mechanical properties of the composites. Under high strain-rate (3100s-1), the 4.56 vol.% TiBw/TMCs showed the highest flow stress (∼1968MPa) and strain (∼15%). The absorbed energy increased first and then decreased with increase of TiB2 content, and the highest absorbed energy of 275.8 MJ.m-3 was achieve by TMC2. Besides, the analysis of fracture appearance indicated that TiBw dominates the failure of the TMCs, fractography of composites varies by the TiBw content of TMCs.