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.
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