Metals Dynamic Recrystallization up to Nanocrystalline Size Induced Shock Loading

This paper is devoted to nanostructure formation in metals under dynamic recrystallization during high-strainrate deformation. The materials under investigation were: copper, different steels, Cu-Mn alloys, aluminum, titanium. All shock tests were carried out under uniaxial strain conditions which were realized in a facility based on a 37 mm bore-diameter compressed gas gun by impactor of thickness 1-3 mm. In a test the sample is subjected to a planar impact. The materials under investigations were in the form of disks 52 mm in diameter and 2-10 mm thick. Shock loading was realized under room temperature in the velocity range 35-650 m/s. The combination of local dynamic response registration of shock loaded specimens with the help of two-channel laser interferometer with their microstructural investigation was used for carrying out these investigations of dynamic recrystallization. Spall strength of metals was determined in these experiments. Regions of dynamic recrystallization with nanostructure similar those which were described in [1-4] were revealed in shock-loaded samples.