High temperature and strain-rate response of AA2124-SiC metal matrix composites

This paper presents the results of study dynamic impact behaviour AA2124-SiC Metal Matrix Composite (MMC) material with different particle reinforcement sizes and qualities using a compressive Split-Hopkinson Pressure Bar (SHPB) apparatus. Mechanical tests were performed at strain rates 1000 s?1, 2000 3000 s?1 temperatures room temperature (25 °C), 100 °C 200 °C. Microstructural analyses carried out on samples pre post-compression experiments to fracture characteristics mechanisms MMC materials. The flow stress-strain, rate, effects deformation mechanism investigated. backscattered electron images show that higher rate induces formation denser smaller grain size CuAl2 precipitates, especially in composites SiC sizes. Temperature has posed minor effect microstructural change. Heating close solution treatment temperature, then followed by an air quenching resulted fine dispersion as well high saturation for materials volumetric fraction reinforcement. SHPB compression reveal 225XF developed highest stress among all For (225XE 225XF), cracks failures have appeared during high-temperature experiments, which is believed be caused increased brittleness result intensified oxide phases.