A TEM Study of Deformation Substructure in High Strain Rate and Explosively Shock-Loaded Polycrystalline Iron

摘要

Residual microstructures developed in polycrystalline iron after deformation at high rates of strain were characterized using transmission electron microscopy (TEM). Long, screw-type dislocations were observed in Hopkinson bar and impacted specimens compared to deformation twinning and dislocation cell structures found in shocked specimens. Localized deformation bands were observed in the impacted specimen. No evidence for deformation twinning was found in the Hopkinson bar and impacted specimens. The effect of substructure produced in the specimens on the hardness of these specimens is also observed.