Experimental Investigation and DEM Simulation of Mass Mixing under Shock Loading

Tin and lead beads are chosen to conduct the high velocity impact experiments with an explosive plane wave generator. The impact velocity is about 2 km/s. A metallurgic picture of the recovered specimen shows that there are four bands along the interfaces between tin and lead. The width across the bands is about 60~80 m. The SEM examination discloses that these bands are the mass mixing regions of tin and lead. The dynamic diffusion coefficient of the experiments is 0.9 cm2/s, which is much higher than that at quasi-static case. A discrete element simulation (DEM) demonstrates the process and mechanisms of the observed mass mixing for Pb-Sn beads under shock loading at meso-scale qualitatively.