Abstract
High strain-rate plastic deformation treatment is applied to modify the mechanical properties of a titanium alloy via gas gun loading. The yield strength, ultimate tensile strength (UTS) and fracture strain derived from stress-strain curves are 1.02–1.18 GPa, 1.23–1.41 GPa and 7.4–10.9%, respectively, for the impact velocities explored. Compared to the untreated titanium alloy, the specimen shocked at 609 m/s exhibits the best strength-toughness tradeoff: the UTS (1.41 GPa) is increased by 14.6%, and the fracture strain (9.7%) is decreased by 11.2%; the relatively small reduction in ductility is related to the {101¯1} contraction twinning and high dislocation density.
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