Abstract
The dynamic behavior of aluminum targets with helium bubbles was investigated in plane impact experiments. From the free surface velocity measurements the spall strength was calculated and analyzed. Theoretical comparison between spall creation due to voids growth and bubbles growth was made. The impacted targets were collected after the impact experiments and examined by TEM. These targets were compared to TEM pictures before the impact. The number of helium atoms in the bubbles was calculated from the electron energy lose spectrum (EELS). Comparison of bubble radiuses and concentration before and after the impact demonstrated bubbles coalescence and EELS measurements showed a reduction of the helium atoms concentration in the bubbles from ∼1028 m−3 before the impact to ∼1027 m−3 after the impact.
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