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Strain-rate sensitivities of 55-65vol.% aluminum 2024-T6/TiB2 composites and the corresponding aluminum 2024-T6 matrix were investigated using split Hopkinson pressure bar.Results showed that 55-65vol.% aluminum 2024-T6/TiB2 composites exhibited significant strain-rate sensitivities,which were three times higher than that of the aluminum 2024-T6 matrix.The strain-rate sensitivity of the aluminum 2024-T6 matrix composites rose obviously with reinforcement content increasing (up to 60%),which agreed with the previous researches.But it decreased as the ceramic reinforcement content reached 65%.The 55-65vol.% aluminum 2024-T6/TiB2 composites showed various fracture characteristics under dynamic loading.Shear instability was the predominated failure mechanism and local aluminum alloy matrix was softened/melted.