Flow stress behavior of Cu13Zn alloy deformed at elevated temperature

Abstract

The flow stress behavior of Cu13Zn alloy was investigated by compression tests carried out at 650 °C, 700 °C, 750 °C, 850 °C, and constant strain rates of 0.05 s⁻¹, 0.1 s⁻¹, 0.5 s⁻¹, 1 s⁻¹, 5 s⁻¹, respectively. The results show that the flow stress increases with the increase of strain and reaches a steady-state stress, and the saturated stress (σ_s) increases with the increase of the strain rate and the decrease of temperature. Flow stress curves of the alloy deformed at elevated temperatures can be simulated effectively by the model proposed by Zhou and Clode, and the flow stress is described as a function of strain, strain rate and temperature. Material constants values are: Q=270.43 kJ/mol, α=0.020 94, A=1.747×10¹¹ s⁻¹ and n=3.549 mm²·N⁻¹, the deformation mechanisms of the alloy are self-diffusion and dynamic recovery.

Keywords

flow stress / deformation mechanism / copper / zinc / alloy