Dynamic Recrystallization During High-Strain-Rate Tension of Copper

Discontinuous dynamic recrystallization can occur during dynamic tensile extrusion of copper, which is subjected to uniaxial tensile strains of similar to 5 and strain rates up to 10(6) s(-1) in the extruded section. Through high-resolution transmission Kikuchi diffraction, we show that nucleation occurs through subgrain rotation and grain boundary bulging at boundaries between < 001 > and < 111 > oriented grains. The observed nuclei consist of subgrains with a size of approximately 200 to 400 nm.