High-temperature deformation behavior of the Cu-0.21 Cr-0.12Ag alloy made by upward continuous casting

The hot deformation behavior and microstructural evolution of Cu-0.21Cr-0.12Ag alloy made by the upward continuous casting were investigated by isothermal compression test, optical microscopy (OM), scanning electron microscopy(SEM), and electron backscatter diffraction(EBSD). The results show that the alloy undergoes complete dynamic recrystallization, and the recrystallized grains size decrease with strain rate increasing at 900 degrees C. Partial dynamic recrystallization occurs in the temperature range from 800 to 850 degrees C, fine recrystallized grains nucleate at grain boundaries, and the percentage of recrystallization decreases with decreasing deformation temperatures. Dynamic recrystallization does not occur at temperatures below 750 degrees C and the softening mechanism is dominated by dynamic recovery. The processing map was developed based on the dynamic material model theory, and it shows that the alloy is prone to instability at deformation temperatures below 730 degrees C.