Improvement in mechanical properties of commercially pure titanium through reverse rolling

Commercially pure (cp) titanium plates were subjected to 90% reduction in thickness through UDR (unidirectional rolling) and RR (reverse rolling) in the cold-rolling route. These rolled plates were then annealed at 600 °C for 20 min. The plates processed through UDR and RR exhibited similar values of ductility, but the plates subjected to RR exhibiting a significant increase in their strength compared to those rolled through UDR. However, on annealing the yield strength of the RR plate was reduced slightly while its ductility improved. Relative growths of dislocation density in the samples appeared to be responsible for such differences in the mechanical properties of the samples.