INVESTIGATION ON HOT DEFORMATION BEHAVIOR OF AL-CU-MG-PB ALLOY

In order to find material parameters of established Zener–Hollomon constitutive equations and predict high-temperature flow stress of Al-Cu-Mg-Pb alloy, isothermal hot compression tests were conducted at constant stain rates of 0.005, 0.05 and 0.5 s-1 and at a temperature range of 623 to 773 K with an interval of 50 K. The results showed that the flow stress of Al-Cu-Mg-Pb alloy increased with increasing strain rate and decreasing deformation temperature, characterized as work-hardening, dynamic recovery and dynamic recrystallization. The effects of strain rate and temperature on hot deformation behavior were represented by Zener–Hollomon parameter including Arrhenius term. The power law, exponential, and sin hyperbolic types of Zener–Hollomon equations were used to determine the hot deformation behavior of Al-Cu-Mg-Pb alloy. The results suggested that the highest correlation coefficient was achieved for the hyperbolic sine law for the studied material. The proposed deformation constitutive equations can be used for numerical simulation of hot forming processes and selection of proper forming parameters in engineering practice.