Microstructural evolution in electroformed nickel shaped-charge liners with nano-sized grains undergone deformation at ultrahigh strain rate

Abstract

Nickel shaped-charge liners with nano-sized grains were prepared by the electroforming technique, and the deformation at ultrahigh strain rate was performed by explosive detonation. The as-formed and post-deformed microstructures of electroformed nickel shaped-charge liners with nano-sized grains were observed by means of transmission electron microscopy, and the orientation distribution of the grains was analyzed by the electron backscattering pattern (EBSP) technique. The melting phenomenon in the jet fragment and the recovery and recrystallization in the slug after plastic deformation at ultrahigh-strain rate were observed in the ultrafine-grained nickel shaped-charge liners. The research evidence shows that dynamic recovery and recrystallization play an important role in plastic deformation at ultrahigh strain rate.

A Nickel Dissolution Process for Multilayer Electroforming to Achieve Ultrahigh Adhesion Strength

“…Electroformed Ni is widely applied as walls in parts of thrust chambers of liquid rocket engines, liners, storage tanks of nuclear fuel, wind tunnel nozzles, and so on [6,7]. Normally, these electroformed Ni walls have a complex geometry and large wall thickness, and their material properties and thickness distribution are the key parameters [8][9][10]. For improving these material properties, some researchers have added special chemical additives to the electroforming bath, but these additives tend to decompose and even absorb on the cathode surface, leading to co-deposition with metal [11,12].…”