Deformation twins in a shock-loaded Ta-2.5w/o W precursor plate and a recovered, Ta-2.5w/o W explosively formed penetrator

摘要

The effect of shock-loading on microstructural evolution and mechanical response of various metals and alloys Has been studied for almost five decades [1-5]. However, BCC metals and alloys, with the exception of iron and ferritic steels, have received much less attention than have FCC materials. Recently, high density BCC materials like tantalum and tantalum-tungsten alloyshave generated a lot of interest due to their arrtlor-defeating capability in such applications as shaped charges and explosively formed penetrators (EFPs). High-explosive generated shock waves interact with the metallic liners and form these penetrators inflight. Consequently, the shock-wave parameters and initial liner microslructures can play an important role in both macro- and microstructural development of these ballistic devices.