Dynamic recrystallization of electroformed copper liners of shaped charges in high-strain-rate plastic deformation

Wenhuai Tian, Hongye Gao, Ailing Fan, Xiaoou Shan, and Qi SunDepartment of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, ChinaBeijing 210 Institute, Beijing 100081, China

摘 要：<正>The microstructures in the electroformed copper liners of shaped charges after high-strain-rate plastic deformation were investigated by transmission electron microscopy （TEM）. Meanwhile, the orientation distribution of the grains in the recovered slug was examined by the electron backscattering Kikuchi pattern （EBSP） technique. EBSP analysis illustrated that unlike the as-formed electro-formed copper liners of shaped charges the grain orientations in the recovered slug are distributed along randomly all the directions after undergoing heavily strain deformation at high-strain rate. Optical microscopy shows a typical recrystallization structure, and TEM examination reveals dislocation cells existed in the thin foil specimen. These results indicate that dynamic recovery and recrystallization occur during this plastic deformation process, and the associated deformation temperature is considered to be higher than 0.6 times the melting point of copper.

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