Transmission electron microscopy was used to study and analyze the twin and dislocation structures of commercial-purity uranium samples in the initial (undeformed) state and after severe deformation induced by shock loading by plane waves with various intensities. As the shock loading intensity increased, the density of chaotically distributed dislocations and twins first increased, and, then, polygonization processes developed and resulted in a sub-grain structure. Crystallographic analysis of the initial and deformation twins in uranium revealed predominant twins of the compound type {130} and rare {172} and {176} second-type twins.

Types of Twins and the Dislocation Structure of α Uranium in the Initial and Explosion-Deformed States. Y.N.Zuev, I.G.Kabanova, V.V.Sagaradze, N.L.Pecherkina, I.V.Podgornova, M.L.Mukhin: The Physics of Metals and Metallography, 2008, 106[1], 97-109