X-ray Imaging of Mg Cavitation

The coupling of dynamic loading platforms with synchrotron light sources have enabled experiments examining void formation in optically opaque materials. Much like spallation in a solid, cavitation occurs when rarefaction waves collide within a liquid. The resulting deformation leads to a complex flow field with numerous voids. It has been suggested that compaction of such a structure may be a significant source of ejecta (i.e. shallow bubble collapse). Here, I will present recent experiments examining cavitation of shock melted Mg using synchrotron radiation. Experiments span shock states that release from just below the ambient melt boundary to into the liquid phase. These results show a complex structure following cavitation, which must be understood if ejecta generated from shallow bubble collapse is to be predicted.