Investigation on critical strain of dynamic recrystallization for SiCp/Al-Cu composite

Using Gleeble-1500D simulator, the critical strain of dynamic recrystallization of SiCp/Al-Cu composite were investigated at 623-773 K with strain rate of 0.01-10 s(-1). The results show that the main softening mechanism is the dynamic recrystallization through the stress-strain curves of SiCp/Al-Cu composite, the activation energy is 272.831 KJ/mol. ln theta-epsilon and (-partial derivative(ln theta)/partial derivative epsilon)-epsilon) curves were plotted based on the experimental data to further obtain the critical strain and steady strain of DRX. Then the critical strain model and the steady-state strain model of DRX were set up. Furthermore, the dynamic recrystallization volume fraction of SiCp/Al-Cu composite was investigated.