The dynamic mechanical response of Al_2O_3 and TiB_2 particulate reinforced aluminum matrix composites produced by in-situ reaction

摘要

The dynamic mechanical responses of three aluminum matrix composites reinforced with in-situ Al_2O_3 and TiB_2 particulates were investigated in compression at strain rates ranging from 1.7 x 10~-3 s~-1 to 1.5 x 10~3 s~-1. The results showed that these composites exhibit a high strain-rate sensitivity. The strength and initial strain hardening rate of the composites tended to increase with increasing strain rate. And increasing the particulate content led to an increase in the strain-rate sensitivity of composites. Furthermore, composites containing Al_3Ti plates exhibited the highest strain-rate sensitivity.