Abstract
An adiabatic shear band produced by the impact of a cylindrical projectile on a target of commercial purity titanium was observed by high-voltage transmission electron microscopy. While the material in the vicinity of the shear band showed a high density of dislocations and deformation twins, the structure of the shear band consisted of small (0.05–0.3 μm) grains with well defined high-angle grain boundaries. The boundary between the matrix and the shear-band material is very well defined showing that the localized deformation regime within the band requires a temperature-strain threshold to become operative. Calculations suggest that the microcrystalline structure is formed during the shear band propagation stage. A simple model for plastic deformation in the shear band is proposed.
Published Version
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