Hot deformation characterization and processing map of Cu–10 %Fe–1.5 %Ag in situ composite

The Cu–10 %Fe–1.5 %Ag in situ composite with high strength, high conductivity and low cost was prepared, and its hot deformation behavior was investigated by isothermal compression test with true strain of 0.69, temperature range of 750–950 °C and strain rate of 0.002–1.000 s⁻¹. The flow stress–strain response shows the characterization of dynamic recrystallization (DRX), and the peak stress increases gradually with deformation temperature decreasing and strain rate increasing. The deformation activation energy of the composite for DRX is calculated as 241.864 kJ·mol⁻¹. The constitutive relation of the composite was got by Arrhenius equation. Furthermore, according to the dynamic material modeling and Kumar–Prasad’s instability criteria, the processing map was constructed and the unsafe regions for hot deformation were analyzed. Based on the processing map and microstructural evolution, the optimal parameter range for hot deformation processing is 750–863 °C at the strain rate of 0.002–0.013 s⁻¹.