Physical Modelling of Hot Rolling for Low-Density Alloy of the Al–Mg–Li–Zr–Zn–Sc System

Abstract

Results are given for physical modeling of hot rolling of alloy with reduced density of the Al–Mg–Li–Zr–Zn–Sc system (1424) in the temperature range 420–480° and deformation rate 1–40 sec^–1. It is established that with a constant strain rate deformation stresses decrease with an increase in test temperature. An increase in strain rate leads to an increase in deformation stress at constant temperature. As a result of dynamic recovery and dynamic recrystallization, there is partial weakening of specimens accompanied by a reduction if deformation stress. Constants are determined for a rheological model of hot deformation, increase the Zener–Hollomon parameter and the rule of a hyperbolic sine: α = 0.023 MPа^–1, n = 1.96, Q = 101.04 kJ/mole, А = 1.22·10⁶ sec^–1. It is shown that alloying with scandium reduces activation energy which leads to weak strain hardening and this means it provides good alloy 1424 production properties.