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.

The internal friction (IF) behaviors, combined with X-ray diffraction (XRD), dilatometry, and transmission electron microscopy (TEM) analysis of the cryogenic treated and tempered M54 steel were systematically investigated. In IF-temperature curves, the peak P₁ was proved to be a Snoek-Ke-Koester (SKK) relaxation peak associated with interstitial carbon atoms in martensite matrix according to its activation energy. The peak P₂ and P₃ were attributed to reverse martensite transformation and martensite transformation, respectively, during the thermal cycle. Based on the analysis results of IF, XRD and TEM, M₂C precipitation indeed occurred during tempering, leading to final ultra-high strength and hardness of the aged M54 steel.