Hot deformation and dynamic recrystallization behavior of a Cu-9Ni-6Sn-0.04Cr alloy

Hot deformation behavior of Cu-9Ni-6Sn-0.04Cr alloy has been investigated by isothermal compression tests in the temperature range of 750 -900 celcius and the strain rate range of 0.01 -10 s-1. By using Arrhenius equation, the activation energy Q of Cu-9Ni-6Sn-0.04Cr alloy is 218 kJ/mol. The predicted flow stresses obtained from the established constitutive equation are consistent with the experimental results for the alloy. The results indicate that proposed constitutive equation offers a high precision for predicting the hot deformation behavior of the Cu-9Ni-6Sn-0.04Cr alloy. In addition, according to the evolution of microstructures, dynamic recrystallization process is the main softening mechanism during hot deformation in Cu-9Ni-6Sn-0.04Cr alloy. Combining the characteristics of dynamic recrystallization process with Zener-Hollomon parameter value, it is shown that continuous dynamic recrystallization is the main dynamic recrystallization mechanism in the high Z value condition. Moreover, and continuous dynamic recrystallization and discontinuous dynamic recrystallization are the main dynamic recrystallization mechanisms in the middle and low Z value condition, the discontinuous dynamic recrystallization is dominated by bulging and nucleation. This study can provide reliable hot working parameters for Cu-Ni-Sn alloy fabrication.

Automated summary

The hot deformation behavior of Cu-9Ni-6Sn-0.04Cr alloy was investigated through isothermal compression tests. The activation energy of Cu-9Ni-6Sn-0.04Cr alloy was determined to be 218 kJ/mol using the Arrhenius equation. The established constitutive equation accurately predicted the flow stresses of the alloy. The study also identified the main softening mechanism as dynamic recrystallization, with continuous dynamic recrystallization being dominant in high Z value condition and both continuous and discontinuous dynamic recrystallization in middle and low Z value conditions.