Structure and Mechanical Properties of the Aluminum Alloy 1570C after Multidirectional Forging with Decreasing Temperature and Subsequent Rolling

The effect of multidirectional forging (MDF) with decreasing temperature and subsequent warm and cold rolling on the structure and mechanical behavior of the alloy 1570C (Al-5Mg-0.18Mn-0.2Sc-0.02Zr (wt.%)) was studied. The first MDF step was carried out at a temperature of 325°C to a strain of about 12 and the second step at 250°C to the strain of about 6. Subsequent rolling was performed in isothermal conditions at the appropriate MDF temperatures, as well as at room temperature with reductions of about 80%. The best complex of service and technological properties, involving data on the parameters of strength, plasticity, superplasticity, was obtained in sheets rolled from high-temperature MDF billet. Despite the more significant grain refinement and unique strengthening, the MDF temperature decrease led to almost complete degradation of superplastic properties. The nature of the alloy behavior found was discussed in detail.