Structure, strength and superplasticity of the bulk 1570C alloy subjected to high-temperature multidirectional isothermal forging

The structure and mechanical properties of the cast non-age-hardenable complex-alloyed 1570C alloy (Al-5Mg-0.18Mn-0.2Sc-0.08Zr, wt%) were studied after multi-directional isothermal forging at 325 °C up to accumulative strain e ≈ 12 and subsequent annealing in the temperature interval from 325 to 500 °C. It is shown that even amid the absence of substantial alloy hardening, high-temperature multi-directional forging is an effective method for processing bulk billets, resulting in a stable and homogeneous (ultra)fine-grained structure with a grain size of about 2 mm, which provided improved ductility and extraordinary high superplastic properties.