Spall in Aluminium with Helium Bubbles under Laser Shock Loading

The spallation behaviors of Al+0.2 wt% ^10B targets and neutron irradiated Al+0.2 wt% ^10B targets with 5 nm radius helium bubble subjected to direct laser ablation are presented. It is found that the spall strength increases significantly with the tensile strain rate, and the helium bubble or boron inclusions in aluminum reduces the spall strength of materials by 34%. However, slight difference is observed in the spall strength of unirradiated samples compared with the irradiated sample with helium bubbles.