Abstract

High-strength titanium alloys are important for aircraft and space vehicles. However, it is hard to reach 1300 MPa with adequate ductility for the strength of most widely used Ti-6Al-4V alloy via conventional deformation and heat treatment. A new strategy based on electropulsing was used to break the limitation. The strong electron flow induced rapid temperature rise and accelerated local element diffusion, which not only caused efficient grain refinement and phase transformation, but also improved the stability of parts of β phases and dislocation density, thus, the subsequent aging effect was greatly enhanced. Electropulsing as a novel method and idea could be considered to improve and control the mechanical properties of Ti-6Al-4V or other alloys with diffusionless transformation.

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