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

摘要

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 420-480A degrees 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: alpha = 0.023 MPD degrees(-1), n = 1.96, Q = 101.04 kJ/mole, D = 1.22 center dot 10(6) 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.