Impact of partial recrystallization on the mechanical properties of severely deformed copper

Combination of severe plastic deformation (SPD) and heat treatment are used as a processing route for producing bimodal grain size copper. Simple shear extrusion is used for SPD processing of samples to reach an ultrafine grain structure which is followed by annealing at different temperatures ranging between 180 °C and 290 °C and different soaking times. Partial recrystallization resulted in a bimodal structure which is observed by optical microscope. Mechanical properties of the samples are characterized by shear punch test (SPT) as shear stress-normalized displacement curves. As a final point, the appropriate annealing time is presented regarding annealing temperature.